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One more BFL Asic board for fun and free design
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Topic: One more BFL Asic board for fun and free design (Read 601 times)
asjfdlksfd
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One more BFL Asic board for fun and free design
September 26, 2013, 02:20:17 AM
Last edit: September 26, 2013, 11:00:42 PM by asjfdlksfd
#1
Cheers,
I try to make my own pcb :-) Details will follow but here the first facts:
Main PCB will get µATX, ATX or E-ATX form factor
Main PSR is default ATX PSR mounted in 19" server rack which the main pcb will be mounted
BFL Chips will be solder on carrier PCB in one of actual CPU Socket form factor (e.g. LGA1155). They will get an copper heat spread on top mounted.
Every Carrier can handle one to max 7 chips (maybe 8 depends on needed adress for PSRs)
On Main PCB CPU sockets will be mounted to connect the BFL carrier and a proper CPU cooler solution
Every BFL will get there own (maybe programmable) psr (which needs one own SPI address for psr controller) with sense lines as near as possible to the chips
Option for external clock is planned (maybe need one more SPI address).
BFL Chip Controller solution is selectable: AVR or Rasberry Pi (or other)
Temperature will be measure by internal chip temp sensor
KiCad will be used for planning the layout and design.
The design files will be shared.
Ready:
Documentation from BFL stored
BFL Chips ordered and fully payed
KiCad installed.
BFL Chip symbol created for KiCad
Next Steps:
Generate simple layout for carrier pcb
Generate simple layout for main pcb
Create chips to socket netlist
Select psr module solution
Open questions:
Documentation from BFL described Done signals in daisy chain mode. On SC Board instead chip done signals are directly connected to AVR. Why?
What are the possible heat spread sizes for different LGA sockets? In fact also what are the dimensions of different cpu's?
How much CPU sockets can be used on main pbc?
Maybe because of large size 2 Layer board could be used for main pcb.
Is the Rasberry Pi strong enough?
When will I get my BFL chip order in hand? In 1st week of october as promised?
How much are the costs of the more expensive parts?
My recent favorites:
8 BFL on LPGA-2011 Carrier with copper heat spread because of needed min. die size 42mm x 42 mm
8 PowerOne DP8120 POL controlled by DM7308 Power controller
Rasberry Pi as Controlller with SPI Mode for controlling BFL Chips
Fallback PSR DeltaOne D12S050201C with trim
References:
BFL Chip description page
https://forums.butterflylabs.com/announcements/3014-butterfly-labs-announces-bulk-chip-sales.html
BFL Chip description link
https://forums.butterflylabs.com/attachments/announcements/1321d1371338930-butterfly-labs-announces-bulk-chip-sales-bfl-sha2-spec-rev2.2-release.pdf
Delta Electronics D12S050201C 20A DC/DC POL
http://www.delta.com.tw/product/ps/dcdc/std/download/data_sheet/DS_D12S05020_10282008.pdf
(Cheap and easy for one chip)
PowerOne ZY1120 20A DC/DC POL
http://www.power-one.com/sites/power-one.com/files/zy1120.pdf
(Expensive still easy to use, parallel configuration possible)
PowerOne DP8120 20A DC/DC POL Digital
http://www.power-one.com/sites/power-one.com/files/documents/power/datasheet/dp8120_data_sheet_1r0.pdf
(Programmable by DM7300G Power Controller)
PowerOne DM7300G Power controller
http://www.power-one.com/sites/power-one.com/files/documents/power/datasheet/dm7300_datasheet_rev_1r0.pdf
(Power controller for PowerOne POL series)
To be continued.
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