4 layers111.5 × 83.9 mm SF2000, the printed circuit board in 3D

SF2000

jbilander/SF200033

Spitfire 2000, A low-end 42 MHz Accelerator with IDE and 4/8 MB fast RAM for the Amiga 2000 co-pro slot (or A500 through an adapter).

Open in PCBKit

Size: 111.5 × 83.9 mm
Copper layers: 4
Thickness: 1.6 mm
Parts: 160
Nets: 444
Pads: 1,280
Tracks, vias: 4,276, 621
Pours: 10
Routed: Yes
KiCad: KiCad 5 (file 20171130)
Created: 31 Dec 2021
Updated: 5 Nov 2026

Overview

SF2000 is an open-source printed circuit board by jbilander, from the jbilander/SF2000 repository on GitHub, published under the CC-BY-SA-4.0 licence. It is a 4-layer board of 111.5 × 83.9 mm with 160 parts on 444 nets, routed with 4,276 tracks and 621 vias.

It is built around the 10M02SCU324C8G, RP2354A and ESP32-C5-WROOM-1U-N8R8, with the W25Q16JVSNIQ, 74LVC8T245PW,118-JSM and SN74CBT16211DL among its other parts. Its parts include 72 capacitors, 27 resistors, 17 ICs, 16 connectors and 2 crystals. It belongs with the ESP32, RP2350, RISC-V and FPGA and CPLD boards of this library.

Main components

README

README.md

SF2000

Spitfire 2000, A low-end 42 MHz Amiga Accelerator based on the Motorola 68SEC000 CPU

This is WORK IN PROGRESS, a DIY hobby project. If you are going to make and sell boards you are also the one doing the customer support.

Revision 3A is brand new and has not been tested yet.

IMPORTANT Please do not build Revision 2B. We have found problems with the bus isolation on that revision which cause SRAM corruption. The Rev. 2B and Rev. 1B bills of material further down are kept for reference only.

The firmware for this board is in a separate repository available here:
https://github.com/jbilander/SF2000-FW

Revision 3A

Full schematic: SF2000_rev3a_schematic.pdf

Revision 1B

***

BOM Rev. 3A

Rev. 3A replaces the four asynchronous SRAMs with a single SDRAM, swaps the Efinix Trion for an Intel/Altera MAX 10, drops the on-board IDE interface, and adds an ESP32-C5 module and an RP2354A. Values and packages below are taken straight from the KiCad netlist.

Designator	Name/Value	Package	Notes
U1	Voltage Regulator 3.3V, LM1117-3.3 or AMS1117-3.3	SOT-223	3.3V 1A Low Drop-Out (LDO) Linear Voltage Regulator, main `3V3` rail LM111733QDCYRQ1 is the automotive-qualified LM1117-3.3 in SOT-223-4; any ordinary LM1117-3.3 in SOT-223 does the same job, and AMS1117-3.3 from AliExpress is a cheap alternative
U2	Voltage Regulator 4.3V, ABLIC S-1132B43-M5T1U or TPS73643DBVR	SOT-23-5	4.3V LDO, the `4V3` supply rail for the CBT FET bus switches U4,U5,U6 S-1132B43-M5T1U
U3	Voltage Regulator 3.3V, TLV75533PDBVR	SOT-23-5	3.3V 500mA LDO, separate `3V3_C5` rail for the ESP32-C5 module so its Wi-Fi bursts stay off the FPGA rail TLV75533PDBVR
U4,U5	Digital Bus Switch 24-Bit FET, SN74CBT16211CDGGR or SN74CBT16811CDGGR	TSSOP-56	FET level-shifter, Amiga +5V bus <-> 3V3 SN74CBT16211CDGGR (Mouser's own part number drops the trailing R, but it is the cut-tape CDGGR)
U6	Digital Bus Switch 10-Bit FET, SN74CBT3244PW	TSSOP-20	FET level-shifter for the remaining control lines SN74CBT3244PW
U7	Bus Transceiver 16-Bit, SN74LVC16245ADGGR	TSSOP-48	Buffers the D0-D15 data bus, direction and output-enable driven by the FPGA (`DATA_DIR`, `OE_D_HIGH`, `OE_D_LOW`) SN74LVC16245ADGGR
U8	Intel/Altera MAX 10 FPGA, 10M04SCU324C8G	BGA-324, 15x15mm, 0.8mm pitch	4000 LE, internal configuration flash and UFM. It has to be the `S` single-supply variant - there is no 1.2V core rail on this board. The symbol and footprint in KiCad are drawn as a 10M02 so the design can be downsized to a 10M02SCU324 later if it fits; the firmware is developed for the 10M04 10M04SCU324C8G / 10M02SCU324C8G
U9	W25Q16JVSNIQ 16 Mbit SPI NOR Flash memory	SOIC-8_3.9x4.9mm_P1.27mm (150-mil Narrow JEDEC SOIC)	W25Q16JVSNIQ or AT25SF161B-SSHD-T
U10	Motorola CPU MC68SEC000AA20 20MHz	QFP-64_14x14mm_Pitch0.8mm	MC68SEC000AA20
U11	SDRAM 8Mx16 (128 Mbit), IM1216SDBABG-6I or AS4C8M16SA-6BINTR	TFBGA-54, 8x8mm, 0.8mm pitch	Replaces the four SRAMs of Rev. 2B. 128 Mbit is 16 MB, which is the whole address space the MC68SEC000 can reach, so there is nothing to gain from a bigger part. The footprint is routed for all 13 address lines, so a 256 Mbit 16Mx16 part (AS4C16M16SA-6BIN) drops straight in as well should a large shadow RAM ever want one - unlikely, but the option costs nothing. On the 128 Mbit parts ball F9 (`A12`) is a no-connect, so the controller's row-address width has to match whichever density is fitted. On the Alliance part the `-6BINTR` suffix is cut tape and `-6BIN` is the tray version of the same device, which costs noticeably more IM1216SDBABG-6I / AS4C8M16SA-6BINTR
U12	74HCT2G14GV,125 Dual Schmitt Trigger Inverter	TSOP-6 / SOT457 / SC-74	Drives the SD_LED header J9 and the /SD_ACTIVE pin J10 at +5V 74HCT2G14GV,125
U13	ESP32-C5-WROOM-1U-N8R8	Module, 18 x 25.5mm, U.FL antenna connector	The `-1U` variant uses an external antenna, so no PCB antenna keep-out is needed under or beside the module. If you fit the PCB-antenna `-1` variant instead, the module has to be moved so its antenna end hangs over the board edge ESP32-C5-WROOM-1U-N8R8 / ESP32-C5-WROOM-1-N8R8
U14	Level shifter 74LVC8T245PW,118	TSSOP-24	Clockport data bus CP_D0-CP_D7. 3V3 on the A side, +5V on the B side, direction and enable from the FPGA 74LVC8T245PW,118
U15	Level shifter 74LVC8T245PW,118	TSSOP-24	Clockport address and control (CP_A2-CP_A5, /CS, /IORD, /IOWR). +5V on the A side, 3V3 on the B side, DIR and /OE tied low so it always drives 3V3 -> +5V 74LVC8T245PW,118
U16	Raspberry Pi RP2354A	QFN-60, 7x7mm, 0.4mm pitch	MCU with 2 MB stacked flash. SPI slave to the FPGA (`SS_RP2354`, `IRQ_RP2354`) plus a UART link to the ESP32-C5 RP2354A (SC1511-A4)
U17	74LVC1G57GV Configurable Multiple-Function Gate	TSOP-6 / SOT457 / SC-88A	Wired as XNOR with A and B tied together: CLK7M = CCK XNOR CCKQ (replaces the SN74LVC2G86DCUR XOR of Rev. 2B). This is how the 7 MHz is generated on every supported machine - the real 7M is not present on the co-pro slot of the early German A2000, nor on A500 Rev 3 and Rev 5, but CCK and CCKQ always are 74LVC1G57GV,125
J1	Goldfingers on PCB, 86-pin	ENIG	Order PCB with Goldfingers, ENIG and 45 degrees chamfered edge (or chamfer the edge yourself with a file)
J2	CFGIN-header, Two-Pin Header	2.54mm (1 x 2)	Put a jumper shunt here to activate autoconfig, or a CONFIGOUT-wire from another device into pin 2. Pin 2 is pulled up to +5V by R21
J3	JTAG-header	Dual row 2.54mm (2 x 5) Pin Male Header
J4	JP-header JP2, JP3	2.54mm (2 x 2) Pin Male Header	JP2 = Generate E-CLK (if the internal 68k is removed from the socket), JP3 = MapROM
J5	SWD pads, SWCLK / GND / SWDIO	2.54mm (1 x 3)	Serial Wire Debug for U16 (RP2354A)
J6	ESP32 UART0, TX0 / RX0	2.54mm (1 x 2) Pin Male Header	Console and flashing header for U13
J7	VCC/GND Two-Pin Header	2.54mm (2 x 1)	VIN +5V used when programming the FPGA standalone (card not installed in the Amiga). Be careful with orientation, check polarity BEFORE plugging-in a phone charger or similar here
J8	GCT MEM2055-00-190-01-A Micro SD Card Socket	9-pin push-pull micro-SD socket	Wired for 4-bit SDIO as well as 1-bit SPI: SD_CS=DAT3, SD_MOSI=CMD, SD_MISO=DAT0, SD_D1=DAT1, SD_D2=DAT2
J9	SD_LED header, Two-Pin Header	2.54mm (2 x 1)	Driven by U12 inverter buffer when /SD_CS is being asserted. Connect here to drive an external HDD-LED
J10	SD_ACTIVE low signal, Right angle Single-Pin Header	0.64 mm square pin angled	Driven by U12 inverter buffer when /SD_CS is being asserted. Connect from here to a LED-board (Active low +5V-signal)
J11	RP2354A UART0, TX0 / RX0	2.54mm (1 x 2) Pin Male Header	Console header for U16
J12	CLOCKPORT-header	2.00mm 22-Pin (2x11) Pin Male Header	Caution: This header is +5V levels. Be careful with orientation
J13	JP-header JP1	2.54mm (2 x 1) Pin Male Header	7 MHz / Turbo selector
J14	USB-C Receptacle USB 2.0, HRO TYPE-C-31-M-12	16-pin SMD	Native USB for the ESP32-C5 (U13)
J15	SPI-header: CS0, PROG_DET, SCK, MISO, MOSI, GND	2.54mm (1 x 6) Pin Male Header	External SPI access to U9. `PROG_DET` tells the FPGA that a programmer is attached so it releases the bus
J16	USB-C Receptacle USB 2.0, HRO TYPE-C-31-M-12	16-pin SMD	Native USB for the RP2354A (U16), UF2 / BOOTSEL
S1	4-way DIP switch, TDB04H0SB1R	SMD, 1.27mm pitch	Autoconfig fast-RAM size, RAMSZ0-RAMSZ3. Pulled up by RN1, so all switches OFF, or the switch not fitted at all, means 8 MB
X1	Crystal Oscillator 20 MHz	Oscillator 5.0 x 3.2mm, 4-pad	Do not populate. Every internal clock is derived from the 7 MHz reconstructed by U17, through the FPGA PLL. X1 is kept in the design in case a free-running clock is needed later; it lands on a dedicated clock input (CLK0p) through R3. Leave the pads empty until then
Y1	Crystal 12 MHz, ABM8-272-T3	3.2 x 2.5mm, 4-pad	CL = 10 pF, +/-30 ppm. With C49/C50 = 15 pF and R12 = 1k this is the RP2350/RP2354 reference oscillator circuit ABM8-272-T3
L1	Inductor 3.3uH, AOTA AB201610S3R3101T	2.0 x 1.6mm SMD shielded power inductor	Switching inductor for the RP2354A internal core buck regulator (`VREG_LX`)
BT1,BT2	Tactile push button	3 x 4 x 2mm SMD, 2-pin	BT1 = BOOT (pulls `BOOTSEL` low through R13), BT2 = RESET (pulls `RUN` low) for U16
BT3,BT4	Tactile push button	3 x 4 x 2mm SMD, 2-pin	BT3 = BOOT (IO28 strap), BT4 = EN/RESET for U13
R1	22 Ω Resistor	0603	Series damping on `CLK_SDRAM`, straight off the FPGA PLL output pin
R2	33 Ω Resistor	0603	Series damping on the 7 MHz generated by U17, into the FPGA clock input
R3	33 Ω Resistor	0603	Series damping on `OSC_CLK` from X1 (only relevant if X1 is fitted)
R4	33 Ω Resistor	0603	Series damping on `CLKCPU` from the FPGA to U10
R5	33 Ω Resistor	0603	Series damping on SPI MOSI
R6	33 Ω Resistor	0603	Series damping on SPI SCLK
R7	33 Ω Resistor	0603	Series damping on `SD_CLK` to the micro SD card
R8	33 Ω Resistor	0603	RC filter into the RP2354A `VREG_AVDD` analog supply, together with C9
R9,R10	27 Ω Resistor	0603	USB series resistors for D+ / D- on J16
R11	330 Ω Resistor	0603	Series resistor for the SD_LED header J9, adjust to your LED and preferred brightness
R12	1k Ω Resistor	0603	Series resistor on `XOUT` of Y1 (RP2354A reference circuit)
R13	1k Ω Resistor	0603	Series resistor between `BOOTSEL` and the BOOT button BT1
R14	4.7k Ω Resistor	0603	Pull-up for `RUN` on U16, with C44 as the reset delay
R15,R16	5.1k Ω Resistor	0603	USB-C CC1 / CC2 pull-downs for J16
R17,R18	5.1k Ω Resistor	0603	USB-C CC1 / CC2 pull-downs for J14
R19	10k Ω Resistor	0603	Pull-up for JTAG `TDI` to 3V3
R20	10k Ω Resistor	0603	Pull-down for JTAG `TCK`
R21	10k Ω Resistor	0603	Pull-up for /CFGIN to +5V (J2 pin 2)
R22	10k Ω Resistor	0603	Pull-up for `ESP32_RTS`
R23	10k Ω Resistor	0603	Pull-down for `PROG_DET`
R24	10k Ω Resistor	0603	Pull-up for the ESP32-C5 `EN` pin, forms an RC reset delay with C46
R25	10k Ω Resistor	0603	Pull-up for `CP_D_OE` on the 3V3 side
R26,R27	10k Ω Resistor	0603	Pull-ups for JP2 and JP3
RN1	Resistor pack 10k Ω (CAY16-103J4LF)	1206	Pull-ups for RAMSZ0-RAMSZ3 (S1) CAY16-103J4LF
RN2	Resistor pack 10k Ω (CAY16-103J4LF)	1206	Pull-ups for JP1, `TMS`, `CONF_DONE` and `nSTATUS`
RN3	Resistor pack 10k Ω (CAY16-103J4LF)	1206	Pull-ups for `ESP32_CTS`, `nCONFIG`, `SD_D2` and `SD_CS`
RN4	Resistor pack 10k Ω (CAY16-103J4LF)	1206	Pull-ups for `SD_CD`, `SD_D1`, `SD_MISO` and `SD_MOSI`
RN5	Resistor pack 10k Ω (CAY16-103J4LF)	1206	Pull-ups for `CP_IOWR`, `CP_IORD`, `CP_CS` (3V3 side) and `SS_W25Q16`
RN6	Resistor pack 10k Ω (CAY16-103J4LF)	1206	Pull-ups to +5V for `RST`, `CP_RTC_CS`, `CP_RTC_DS` and `CP_INT6` on the clockport
C1	Polarized Electrolytic Capacitor 100uF	CP_Elec_6.3x7.7 mm	Wurth SMD WCAP-AS5H 100uF
C2	Polarized Electrolytic Capacitor 22uF	CP_Elec_5x5.8 mm	Wurth SMD WCAP-AS5H 22uF
C3-C8	Ceramic Capacitor 10uF	1206	Bulk on the 3V3, 4V3, 3V3_C5 and clockport +5V rails
C9-C11	Ceramic Capacitor 4.7uF	1206	RP2354A supplies and core buck output
C12	Ceramic Capacitor 0.47uF = 470nF	1206
C13	Ceramic Capacitor 0.22uF = 220nF	1206	Local reservoir at the ESP32-C5 3V3 pin
C14-C19	Ceramic Capacitor 0.1uF = 100nF	0805
C20-C46	Ceramic Capacitor 0.1uF = 100nF	0603	Decoupling
C47,C48	Ceramic Capacitor 0.01uF = 10nF	0603
C49,C50	Ceramic Capacitor 15pF	0603	Load capacitors for Y1
C51-C72	Ceramic Capacitor 0.1uF = 100nF	0402	The cluster on the underside directly beneath U8 and U11

Rev. 3A board layout

Four layer stackup. The top and bottom layers carry the signal routing with a GND pour filling the gaps, the second layer is a solid GND plane and the third layer is a 3.3V plane.
Top layer, and the GND plane on inner layer 1:

The 3.3V plane on inner layer 2, and the bottom layer:

BOM Rev. 2B

Designator	Name/Value	Package	Notes
U1	Voltage Regulator 3.3V, LM1117-3.3 or AMS1117-3.3	SOT-223	3.3V 1A Low Drop-Out (LDO) Linear Voltage regulator
U2	Voltage Regulator 4.3V, ABLIC S-1132B43-M5T1U or TPS73643DBVR	SOT-23-5	4.3V LDO Linear Voltage Regulator S-1132B43-M5T1U
U3	Voltage Regulator 1.2V, TLV73312PDBVR	SOT-23-5	1.2V LDO Linear Voltage Regulator TLV73312PDBVR
U4,U5,U6	Digital Bus Switch ICs 24-Bit FET, SN74CBT16211CDGGR or SN74CBT16811CDGGR	TSSOP-56	FET Level-shifter SN74CBT16211CDGGR or SN74CBT16811CDGGR
U7	Dual XOR gate SN74LVC2G86DCUR	VSSOP-8_2.3x2mm_P0.5mm	Generates 7 MHz CLK from ~(CCK XOR CCKQ) SN74LVC2G86DCUR
U8	Efinix Trion T8 FPGA T8Q144C3	LQFP-144_20x20mm_P0.5mm	FPGA - Field Programmable Gate Array, 7384 LE, 97 I/O T8Q144C3
U9	W25Q16JVSNIQ 16 Mbit SPI NOR Flash memory	SOIC-8_3.9x4.9mm_P1.27mm (150-mil Narrow JEDEC SOIC)	W25Q16JVSNIQ or AT25SF161B-SSHD-T
U10	Motorola CPU MC68SEC000AA20 20MHz	QFP-64_14x14mm_Pitch0.8mm	MC68SEC000AA20
U11	SST39LF802C-55-4C-EKE or SST39LF800A-55-4C-EKE	TSOP-I-48_18.4x12mm_P0.5mm	NOR Flash 3.0 to 3.6V 8Mbit Multi-Purpose Flash (for Kickstart) S39LF802C554CEKE S39LF800A554CEKE
U12	74AHCT14PW, Six Channel Schmitt Trigger Inverter	TSSOP-14_4.4x5mm_P0.65mm	74AHCT14PW,118 or SN74AHCT14PWR
U13	NOR Flash SST39LF040-55-4C-NHE-T	PLCC-32	NOR Flash 3.0 to 3.6V SST39LF040554CN (or 39LF020, 39LF010)
U14,U15	SRAM ISSI IS61WV20488FBLL-10TLI	TSOP-44	First 4 MB SRAM High-Speed, Async, 2Mbx8, 10ns, 2.4v-3.6v, 44 Pin TSOP II, RoHS IS61WV20488FBLL-10TLI
U16,U17	SRAM ISSI IS61WV20488FBLL-10TLI	TSOP-44	Second 4 MB (Optional) --"--
J1	Goldfingers on PCB	ENIG	Order PCB with Goldfingers, ENIG and 45 degrees chamfered edge (or chamfer the edge yourself with a file)
J2	CFGIN-header Two-Pin Header	2.54mm pitch	Put a Jumper shunt here to activate autoconfig, or a CONFIGOUT-wire from other device to the right (pin 2) in this header.
J3	JTAG-header	Dual row 2.54mm (2 x 5) Pin Male Header
J4	JP-header JP2	2.00mm (2 x 1) Pin Male Header	Generate E-CLK (if internal 68k is removed from socket)
J5	JP-header JP3	2.00mm (2 x 1) Pin Male Header	Rom overlay jumper
J6	JP-header JP4	2.00mm (2 x 1) Pin Male Header	4/8 MB SRAM Config
J7	VCC/GND Two-Pin Header	2.54mm pitch	VIN +5V used when programming FPGA standalone (card not installed in the Amiga). Be careful with orientation, check polarity BEFORE plugging-in a phone charger or similar here.
J8	Sunrom Micro SD Card Holder	9-pin Micro SD card slot connector	Sunrom Micro-SD card holder
J9	SD_LED header, Two-Pin Header	2.54mm pitch	Driven by U12 inverter buffer when /SD_CS is being asserted. Connect to here in order to drive an external HDD-LED
J10	SD_ACTIVE low signal, Right angle Single-Pin Header	0.64 mm square pin angled	Driven by U12 inverter buffer when /SD_CS is being asserted. Connect to here in order to drive a LED-board (Active low +5V-signal)
J11	Rom-bank selector	2.00mm (2 x 1) Pin Male Header	Select first or second bank, address line A15 (pin 3) on U13 (SST39LF040)
J12	CLOCKPORT-header	2.00mm 22-Pin (2x11) Pin Male Header	Caution: This header is +5V levels. Be careful with orientation.
J13	JP-header JP1	2.54mm (2 x 1) Pin Male Header	7 MHz / Turbo selector
X1	Crystal Oscillator 20 MHz	Oscillator_7.0x5.0mm
R1	33 Ω Resistor	0805	Damping resistor for 20 MHz clock-signal coming from X1 oscillator
R2	33 Ω Resistor	0805	Damping resistor for 7 MHz clock-signal coming from U7 (SN74LVC2G86DCUR)
R3	33 Ω Resistor	0805	Damping resistor for CLKCPU clock-signal coming from FPGA pin 33
R4	~220 Ω Resistor	0805	Series resistor for SD_LED header J9, adjust R-value to your type of LED and preferred brightness
R5	10k Ω Resistor	0805	Pull-up resistor for /FLASH_OE to 3V3
R6	10k Ω Resistor	0805	Pull-up resistor for JP2 to 3V3
R7	10k Ω Resistor	0805	Pull-up resistor for /CFGIN to 5V
R8	100k Ω Resistor	0805	Pull-up resistor for CRESET_N to 3V3
RN1-RN6	Resistor pack 10k Ω (CAY16-103J4LF)	1206	CAY16-103J4LF
C1	Polarized Electrolytic Capacitor 100uF	CP_Elec_6.3x7.7 mm	Wurth SMD WCAP-AS5H 100uF
C2	Polarized Electrolytic Capacitor 22uF	CP_Elec_5x5.8 mm	Wurth SMD WCAP-AS5H 22uF
C3-C7	Ceramic Capacitor 10uF	1206
C8	Ceramic Capacitor 2.2uF	1206
C9	Ceramic Capacitor 0.47uF = 470 nF	1206
C10-C39	Ceramic Capacitor 0.1uF = 100nF	0805
C40-C54	Capacitor 0.01uF = 10nF	0805

BOM Rev. 1B

Designator	Name/Value	Package	Notes
U1	Voltage Regulator 3.3V, LM1117-3.3 or AMS1117-3.3	SOT-223	3.3V 1A Low Drop-Out (LDO) Voltage regulator. https://www.aliexpress.com/item/32869037691.html
U2	Voltage Regulator 4.3V, TPS73643DBVR or ABLIC S-1200B43-M5T1U or MIC5205YM5-TR ADJ (with R1,R2 and C7 populated)	SOT-23-5	4.3V LDO Voltage Regulator * TPS73643DBVR * S-1132B43-M5T1U * MIC5205YM5-TR (Adjustable, populate R1,R2,C7)
U3	Inverter Schmitt Trigger 74LVC2G14GV,125	TSOP-6/SOT457/SC-74	* LVC2G14GV125
U4,U5,U6	Digital Bus Switch ICs 24-Bit FET, SN74CBT16211ADGGR	TSSOP-56	FET Level-shifter * SN74CBT16211ADGGR * SN74CBT16811CDGG
U7	XNOR gate w/ Schmitt Trigger SN74AUP1T87DCKR	TSSOP-5/SC-70-5/SOT-353-1	Generates 7 MHz CLK from CCK XNOR CCKQ * SN74AUP1T87DCKR
U8	Gowin FPGA GW1N-UV9LQ144C6/I5	LQFP-144	FPGA - Field Programmable Gate Array, 8640 LE, 120 I/O * GW1N-UV9LQ144C6/I5
U9	Motorola CPU MC68SEC000AA20	QFP-64	MPU 32-bit 20MHz Contact Eriond to buy a NOS CPU for a reasonable price
U10,U11	SRAM ISSI IS61WV20488FBLL-10TLI	TSOP-44	First 4 MB SRAM High-Speed, Async, 2Mbx8, 10ns, 2.4v-3.6v, 44 Pin TSOP II, RoHS * 61W20488FBLL10TI
U12,U13	SRAM ISSI IS61WV20488FBLL-10TLI	TSOP-44	Second 4 MB (Optional) --"--
U14	NOR Flash SST39LF040-55-4C-NHE-T	PLCC-32	NOR Flash 3.0 to 3.6V (For Oktagon/Oktapus. IDE-driver) * SST39LF040554CN (or 39LF020, 39LF010)
U15	SST39LF802C-55-4C-EKE	TSOP-48	NOR Flash 3.0 to 3.6V 8Mbit Multi-Purpose Flash (for Kickstart) * S39LF802C554CEKE
U16,U17,U18	Bus Transceiver 74LVC245APW,118	TSSOP-20	* 74LVC245APW-T
J1	Goldfingers on PCB	ENIG	Order PCB with Goldfingers, ENIG and 45 degrees chamfered edge (or chamfer the edge yourself)
J2	JTAG-header	Dual row 2.54mm (2 x 5) Pin Male Header Strip
J3	JP-header JP2,JP3,JP4	Dual row 2.00mm (2 x 3) Pin Male Header Strip	Turbo speed selector
J4	JP-header JP5	2.00mm (2 x 1) Pin Male Header	Generate E-CLK (if internal 68k is removed from socket)
J5	IDE/ATA-header	2.00mm 44-Pin (2x22 Pin) Straight Male Shrouded PCB Box header IDC Socket	For A2000: * Shrouded header For A500 internal mount a right angled female header can be used (2x25 and cut down to 2x22): * Right Angle Female Connector
J6	Sunrom Micro SD Card Holder	9-pin Micro SD card slot connector	* Sunrom Micro-SD card holder
J7	VCC/GND Two-Pin Header 2.54mm pitch	2.54mm pitch	VIN +5V used when programming FPGA standalone (card not installed in the Amiga). Be careful with orientation, check polarity BEFORE plugging-in a phone charger or similar here.
J8	JP-header JP6	2.00mm (2 x 1) Pin Male Header	4/8 MB SRAM Config
J9,J10	JP-header JP7,JP8	2.00mm (2 x 2) Pin Male Header	JP7 Autoboot IDE OFF/ON Selector, JP8 Oktagon/Oktapus. IDE-driver Selector
J11	LED Two-Pin Header 2.54mm pitch	2.54mm pitch	Driven by U3 inverter buffer when /Active on IDE is being asserted. Connect to here to drive an external HDD-LED
J12	/Active signal, Single-Pin Header 2.54mm	2.54mm pitch	/Active signal from IDE. Connect from here to a * LED-board
J13	Pmod Type 2A (SPI) Female header, 12-Pin (2x6)	2.54mm pitch	For connecting SPI peripherals. * Right-Angled (A2000) or * Straight (A500) to not interfere with RGBtoHDMI-adapter inside A500
R1	1.2k Ω Resistor	0805	Feedback resistor, Only populate if U2 is of ADJ-ustable type (e.g. MIC5205YM5-TR)
R2	3k Ω Resistor	0805	Feedback resistor, Only populate if U2 is of ADJ-ustable type (e.g. MIC5205YM5-TR)
R3	10k Ω Resistor	0805	Pull-up resistor for /CFGIN (5V-side)
R4	10k Ω Resistor	0805	Pull-up resistor in RC-debounce circuit
R5	10k Ω Resistor	0805	Series resistor in RC-debounce circuit
R6	~220 Ω Resistor	0805, 200 mW	Series resistor for IDE-LED header J11, adjust R-value to your type of LED and preferred brightness
R7	1k Ω Resistor	0805	Pull-down resistor for IDE_IRQ
R8	4.7k Ω Resistor	0805	Pull-up resistor for IDE_IORDY
R9	10k Ω Resistor	0805	Pull-up resistor for JP6
R10	1k Ω Resistor	0805	Pull-down resistor for MODE0 (Gowin FPGA boot/configure from embFlash)
R11	1k Ω Resistor	0805	Pull-down resistor for MODE1 (Gowin FPGA boot/configure from embFlash)
R12	10k Ω Resistor	0805	Pull-up resistor for RECONFIG_N (Gowin FPGA) and /SPI_CS (in J13 Pmod-header)
R13	10k Ω Resistor	0805	Pull-up resistor for /ACTIVE (IDE)
RN1-RN2,RN5	Resistor pack 10k Ω (CAY16-103J4LF)	1206	* CAY16-103J4LF Pull-up resistors.
RN3-RN4	Resistor pack 10k Ω (CAY16-103J4LF) or 4.7k (CAY16-4701F4LF)	1206	* CAY16-4701F4LF Pull-up resistors for SD0-SD3,SD_CD,SD_CMD,JP7,JP8
C1-C2	Capacitor 10uF	1206
C3	Capacitor 0.1uF = 100nF	0805
C4	Polarized Capacitor 100uF	CP_Elec_6.3x7.7	* Wurth SMD WCAP-AS5H 100uF
C5	Polarized Capacitor 22uF	CP_Elec_5x5.8	* Wurth SMD WCAP-AS5H 22uF
C6	Capacitor 10uF to 0.22uF	1206	Check datasheet for U2 what is suitable here.
C7	Capacitor 0.33uF = 330nF	1206	(Not needed if U2 is TPS73643DBVR, check your U2-datasheet)
C8	Capacitor 10uF	1206
C9-C25	Capacitor 0.1uF = 100nF	0805	C24 capacitor in RC-debounce circuit
C26-C27	Capacitor 10uF	1206
C28-C46	Capacitor 0.01uF = 10nF	0805

A SF2000 shared shopping cart with most of the stuff in the list, no 3V3-regulator though and not all birdseed (passives): https://www.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=fdb374e26b

The FPGA used in this Accelerator board, please note it has to be the Voltage UV version because of 3.3V is being used for all VCC/VCCIO on the Accelerator:

Ordering details (JLCPCB):

*** ### MC68SEC000

The SF2000 is based on the MC68SEC000 CPU
https://www.nxp.com/docs/en/product-brief/MC68SEC000.pdf

You can contact Eriond, https://github.com/eriond (over at A314 or Retro Tinkering or SUGA (Swedish User Group Amiga) discord) to buy a NOS MC68SEC000 at a reasonable price.

Installing in A500 or A2000:

Internal A500 installation with this adapter:
https://github.com/jbilander/A500_Edge_Expansion_adapter

External A500 installation with this adapter:
https://github.com/jbilander/POC86

A2000 Co-pro slot:

***

Building

Follow the dots to get the correct orientation of the chips when soldering, don't rely on the silkscreen text.

You can solder the 3V3 LDO and the FPGA first and then check that you can communicate via JTAG programming a simple LED-blink example or similar. +5V you can take from a USB phone-charger or similar, check polarity before you plug it in.

Make sure you populate the 4V3 LDO like this if you are using TPS73643DBVR or ABLIC S-1200B43-M5T1U, populating R1,R2,C7 is only for a ADJ-regulator to achieve 4V3.

For A2000 and ribbon cable use you can solder a 44 pin IDE-header like this:

Performance

Some MC68SEC000 can be overclocked to 42 MHz and running with only one wait state for the IDE/ATA interface we can reach really good performance:

Flashing a ROM (in this case 3.1.4) to the FlashROM chip U15 (using LIV2's excellent sfflash-tool) and closing JP9 even better performance can be achieved:

Demo video:
https://drive.google.com/file/d/1dCBK24LUC5VLB2dshrW_5n82D2emHB5-/view?usp=sharing

But for running more stable a few wait states can be added to the IDE/ATA,
https://github.com/jbilander/SF2000-FW/blob/main/rtl/ata.v#L56
resulting in a bit slower IDE:

JTAG-header description:

Happy Hackin'

This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.

Parts

160

Qty	Value	Footprint	References
27	0.1uF	Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder	C20, C21, C22, C23, C24, C25, C26, C27, C28, C29, C30, C31, C32, C33, C34, C35 +11
22	0.1uF	Capacitor_SMD:C_0402_1005Metric_Pad0.74x0.62mm_HandSolder	C51, C52, C53, C54, C55, C56, C57, C58, C59, C60, C61, C62, C63, C64, C65, C66 +6
9	10k	Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder	R19, R20, R21, R22, R23, R24, R25, R26, R27
7	33	Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder	R2, R3, R4, R5, R6, R7, R8
6	10k_Pack04	SF2000:RESCAF80P320X160X60-8N	RN1, RN2, RN3, RN4, RN5, RN6
5	0.1uF	Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder	C14, C15, C16, C17, C18
5	10uF	Capacitor_SMD:C_1206_3216Metric_Pad1.42x1.75mm_HandSolder	C3, C4, C5, C7, C8
4	5k1	Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder	R15, R16, R17, R18
4	BT_Push	SF2000:Sunrom_Tactile_Switch_3x4x2mm_SMD_2-Pin	BT1, BT2, BT3, BT4
3	4.7uF	Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder	C9, C10, C11
3	Conn_01x02	Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical	J2, J6, J11
3	Conn_02x01	Connector_PinHeader_2.54mm:PinHeader_2x01_P2.54mm_Vertical	J7, J9, J13
2	0.01uF	Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder	C47, C48
2	15pF	Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder	C49, C50
2	1k	Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder	R12, R13
2	27	Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder	R9, R10
2	74LVC8T245PW,118	Package_SO:TSSOP-24_4.4x7.8mm_P0.65mm	U14, U15
2	SN74CBT16211	Package_SO:TSSOP-56_6.1x14mm_P0.5mm	U4, U5
2	USB_C_Receptacle_USB2.0	Connector_USB:USB_C_Receptacle_HRO_TYPE-C-31-M-12	J14, J16
1	0.1uF	Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder	C19
1	0.22uF	Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder	C13
1	0.47uF	Capacitor_SMD:C_1206_3216Metric_Pad1.42x1.75mm_HandSolder	C12
1	100uF	Capacitor_SMD:CP_Elec_6.3x7.7	C1
1	10M02SCU324C8G	Package_BGA:BGA-324_15.0x15.0mm_Layout18x18_P0.8mm_Ball0.5mm_Pad0.4mm_NSMD	U8
1	10uF	Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder	C6
1	22	Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder	R1
1	22uF	Capacitor_SMD:CP_Elec_5x5.8	C2
1	3.3uH	SF2000:AOTAB201610S3R3101T	L1
1	330	Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder	R11
1	4.7k	Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder	R14
1	68000D	SF2000:QFP-64_14x14mm_Pitch0.8mm	U10
1	74HCT2G14GV,125	Package_SO:TSOP-6_1.65x3.05mm_P0.95mm	U12
1	74LVC1G57GV	Package_SO:TSOP-6_1.65x3.05mm_P0.95mm	U17
1	ABLIC S-1132B43-M5T1U	Package_TO_SOT_SMD:SOT-23-5	U2
1	ABM8-272-T3	Crystal:Crystal_SMD_Abracon_ABM8G-4Pin_3.2x2.5mm	Y1
1	AS4C16M16SA-6BIN	SF2000:BGA54C80P9X9_800X800X120	U11
1	Conn_01x01	Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Horizontal	J10
1	Conn_01x03	Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical	J5
1	Conn_01x06	Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical	J15
1	Conn_02x02_Odd_Even	Connector_PinHeader_2.54mm:PinHeader_2x02_P2.54mm_Vertical	J4
1	Conn_02x05_Odd_Even	Connector_PinHeader_2.54mm:PinHeader_2x05_P2.54mm_Vertical	J3
1	Conn_02x11_Odd_Even	Connector_PinHeader_2.00mm:PinHeader_2x11_P2.00mm_Vertical	J12
1	Conn_2Rows-86Pins_even_odd	SF2000:A500_86pin_Edge_Connector	J1
1	ESP32-C5-WROOM-1U-N8R8	SF2000:ESP32C5WROOM1UN8R8	U13
1	LM1117-3.3	Package_TO_SOT_SMD:SOT-223	U1
1	LOGO	SF2000:Parachute	G***
1	LOGO	SF2000:Spitfire2	G***
1	LOGO	SF2000:Falcon	G***
1	LOGO	SF2000:Wings	G***
1	LOGO	SF2000:Eagle	G***
1	LOGO	SF2000:Fokker_plane	G***
1	LOGO	SF2000:Spitfire	G***
1	LOGO	SF2000:Hot-Air-Balloon	G***
1	Micro_SD_Card_Socket	SF2000:GCT-MEM2055-00-190-01-A	J8
1	Oscillator_5.0x3.2mm	Oscillator:Oscillator_SMD_SeikoEpson_SG8002LB-4Pin_5.0x3.2mm	X1
1	RP2354A	SF2000:SC150913A4	U16
1	SN74CBT3244PW	Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm	U6
1	SN74LVC16245ADGGR	Package_SO:TSSOP-48_6.1x12.5mm_P0.5mm	U7
1	TDB04H0SB1R	SF2000:TDB04H0SB1	S1
1	TLV75533PDBVR	Package_TO_SOT_SMD:SOT-23-5_HandSoldering	U3
1	W25Q16JVSNIQ	Package_SO:SOIC-8_3.9x4.9mm_P1.27mm	U9

The 154 most common of 160 parts.

Questions

How big is the SF2000 PCB?

It measures 111.5 × 83.9 mm and has 4 copper layers, 1.6 mm thick.

What parts does the SF2000 use?

160 parts, built around the 10M02SCU324C8G, RP2354A, ESP32-C5-WROOM-1U-N8R8 and W25Q16JVSNIQ. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.

Where can I download the SF2000 KiCad files?

From the jbilander/SF2000 repository on GitHub, at the commit this page was made from: the board is KiCad/SF2000.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.

Can I use the SF2000 design in my own project?

Its repository publishes it under the CC-BY-SA-4.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).

Category and platform

ESP32 RP2350 RISC-V FPGA and CPLD

Project files

Show this board on your page

A live frame, for any web page

<iframe src="https://pcbkit.io/embed/boards/jbilander-sf2000" title="SF2000 in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe>

A picture

<img src="https://pcbkit.io/embed/boards/jbilander-sf2000.jpg" alt="SF2000" width="1200" height="900">

A picture that opens the board, for a README

[![SF2000](https://pcbkit.io/embed/boards/jbilander-sf2000.jpg?size=s)](https://pcbkit.io/boards/jbilander-sf2000)

Source

Repository: jbilander/SF2000
Board file: KiCad/SF2000.kicad_pcb
Commit: 4309599
Licence: CC-BY-SA-4.0

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