Problems with Decelerator prototype v0.2

rkujawa commented 8 years ago

Lets use this issue to track problems with PCB design v0.2

[x] Provide a way to terminate the _FPUCS by generating _BERR when FPU is absent.
[x] Some local bus slot pins are incorrectly numbered (rows 2/3 and 6/7).
[ ] Provide a way to block _AS/_DS delivery to main board, in case we are decoding the address on a card (not really a problem now, as we just use _RAMSLOT, but in the future we might want to decode it in CPLD).
[x] Connect _CIIN to CPLD, without that we can't control cache inhibit and possibly violate timings.
[x] Pins 119 and 120 of QFP are mismatched.
[x] The PCB has wrong dimensions that potentially conflicts with A3000. The board size should be based on CyberStorm Mk-III/PPC, which is known to be compatible with all existing Amiga models featuring local bus slot.

rkujawa commented 8 years ago

Local bus slot pin numbering fixed by @jarob10 commit Sakura-IT/kicad-myparts@5dbb072d767a63a529620fdeb88b01f66f8d56a8 .

Pinout correction image

rkujawa commented 8 years ago

_BERR generation when FPU is absent and QFP CPU pins mismatch fixed by @jarob10 commit c009a9950c43db73c895c168a1be03c1ebc944dd.

jarob10 commented 8 years ago

Connect _CIIN to CPLD and add pullup resistors to the Jtag by @jarob10 commit 28ce795.

jarob10 commented 8 years ago

Fix wrong PCB dimensions in rev0.3 board by @jarob10 commit 6349a9f

Sakura-IT / decelerator4030