Progress April - II : Hardware costs
Added 2016-04-09 14:46:44 +0000 UTCDid some more component selection, most of the ICs are chosen.
Still nothing definitive, and the people making the IcoBoard informed me that their hardware might suit my needs. Decisions will have to be taken :)
Here's the current BOM if I chose to go for a completely custom board. Digikey part numbers are in parenthesis:
* XC6SLX16-2FTG256C (122-1672-ND) - Main FPGA
* XC9572XL-10TQG100C (122-1386-ND) - Graphics serializer CPLD, saves I/Os
* ADV7125 (ADV7125KSTZ50-ND) - Video DAC
* IS62C256AL-45ULI-TR (706-1310-1-ND) - Work SRAM
* SST39VF020-70-4C-WHE (SST39VF020-70-4C-WHE-ND) - SFIX ROM
* M29W400DT55N6E (M29W400DT55N6E-ND) - System ROM
* 74ALVC164245 (568-4985-1-ND) - 16bit level adapters/buffers
* 193-8MS (CT1938MS-ND) - Dipswitch
* A-DS 15 A/KG-T2S(AE10974-ND) - Joypad connector
* MD-90S (CP-2490-ND) - MiniDIN-9 A/V connector
* 345-100-520-201 (151-1301-ND) - Cartridge connector
Counting one part more than required for each, it sums up to $131.
I'm estimating power supply parts and passives to add $30 more.
Regarding the board itself, I've read Marshallh's BGA slides (again) and tried breaking out the FPGA: 4 layers is definitely enough !
I got an ad for Gold Phoenix's new 4-layer pooling service last week. The best deal I can get from them is $90 + $45 shipping (ouch) = $135 for one 6x3.4in board. PCBShopper gives about the same price for other Chinese board houses but for 5 boards and a stencil (nice !). OSHPark tells $205 for the same size and 3 boards.
TL;DR: The complete board will end up costing around $400. No surprises :)
