4 layers84.5 × 32.5 mm
4 layers59 × 32 mm
Cp pi if fit shield
niklasekstrom/clockport_pi_interface61Amiga clock port to Raspberry Pi interface
- Size
- 59 × 32 mm
- Copper layers
- 4
- Thickness
- 1.59 mm
- Parts
- 15
- Nets
- 79
- Pads
- 214
- Tracks, vias
- 484, 39
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 15 Jun 2022
- Updated
- 18 Nov 2023
Overview
Cp pi if fit shield is an open-source printed circuit board by niklasekstrom, from the niklasekstrom/clockport_pi_interface repository on GitHub, published under the GPL-3.0 licence. It is a 4-layer board of 59 × 32 mm with 15 parts on 79 nets, routed with 484 tracks and 39 vias.
It is built around the SN74LVC573APWRE4 and IS63WV1288DBLL-10TLI. Its parts include 8 capacitors, 4 ICs and 2 connectors. It belongs with the retro computing and games and lEDs and displays boards and the FPGA and CPLD boards of this library.
Main components
2README
README.mdAmiga clock port to Raspberry Pi interface
This interface has a small 64 kB SRAM memory that is shared between an Amiga and a Raspberry Pi. The Amiga connects to the interface through the clock port.
The A314 software has been adapted to this interface so that it is possible to run services such as a314fs and the SANA-II network driver. This board has later become referenced to as A314-cp. The software for all variants of A314 is available in the main branch of the a314 repository. The instructions for how to install the software is in the Software/README.md file.
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Details about how the interface works
Either side, the Amiga or the Pi, can read from and write to the SRAM. The interface is 8 bits wide, meaning that each access reads or writes one byte. The interface is symmetric between the sides, so in this description we describe how the Amiga is communicating with the interface, but the communicating between the Pi and the interface works in the same way.
The Amiga can perform two commands towards the interface:
- Read a register
- Write a register
The interface exposes four registers:
- REG_SRAM = 0
- REG_IRQ = 1
- REG_A_LO = 2
- REG_A_HI = 3
The interface has the following state variables:
- Amiga address pointer, 16 bits
- Pi address pointer, 16 bits
- Amiga interrupt request, 1 bit
- Pi interrupt request, 1 bit
The actions that the Amiga can do, and their effects:
- Write REG_A_LO or REG_A_HI: update the Amiga address pointer.
- Write REG_IRQ: write 0 to clear the Amiga interrupt request bit, and write 1 to set the Pi interrupt request bit.
- Read REG_SRAM: reads and returns the byte in SRAM that the Amiga address pointer points to, and then increments the pointer.
- Write REG_SRAM: same as above but writes a byte to SRAM and increments address pointer.
So in order to read and write to the SRAM, either side must set the address pointer, and then repeatedly read (or write) REG_SRAM in order to read (or write) subsequent positions in the memory.
Bill of materials
| References | Value | Footprint | Quantity |
|---|---|---|---|
| C1, C2, C3, C4, C5, C6, C7, C8 | 0.1u | C_0603_1608Metric | 8 |
| U1 | XC9572XL-VQ64 | TQFP-64_10x10mm_P0.5mm | 1 |
| IC2, IC3 | SN74LVC573APWRE4 (alt: 74LVC573APW,118) | SOP65P640X120-20N | 2 |
| IC1 | IS63WV1288DBLL-10TLI (alt: IS61WV1288EEBLL-10TLI) | SOIC127P1176X120-32N | 1 |
| J1 | Raspberry_Pi_2_3 | PinSocket_2x20_P2.54mm_Vertical | 1 |
| J2 | Conn_02x11_Odd_Even | PinSocket_2x11_P2.00mm_Vertical | 1 |
Parts
15| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | 0.1u | Capacitor_SMD:C_0603_1608Metric | C1, C2, C3, C4, C5, C6, C7, C8 |
| 2 | SN74LVC573APWRE4 | SamacSys_Parts:SOP65P640X120-20N | IC2, IC3 |
| 1 | Conn_02x11_Odd_Even | Connector_PinSocket_2.00mm:PinSocket_2x11_P2.00mm_Vertical | J2 |
| 1 | IS63WV1288DBLL-10TLI | SamacSys_Parts:SOIC127P1176X120-32N | IC1 |
| 1 | Raspberry_Pi_2_3 | Connector_PinSocket_2.54mm:PinSocket_2x20_P2.54mm_Vertical | J1 |
| 1 | XC9572XL-VQ64 | Package_QFP:TQFP-64_10x10mm_P0.5mm | U1 |
The 14 most common of 15 parts.
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Questions
How big is the Cp pi if fit shield PCB?
It measures 59 × 32 mm and has 4 copper layers, 1.59 mm thick.
What parts does the Cp pi if fit shield use?
15 parts, built around the SN74LVC573APWRE4 and IS63WV1288DBLL-10TLI. 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 Cp pi if fit shield KiCad files?
From the niklasekstrom/clockport_pi_interface repository on GitHub, at the commit this page was made from: the board is Hardware/cp_pi_if_fit_shield.kicad_pcb and its schematic Hardware/cp_pi_if.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Cp pi if fit shield design in my own project?
Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).