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FPGA serial programming interface

Added by stephan berner almost 6 years ago

hi,

are the pins CCLK, DIN and the MODE pins available on the OMAP-138 as GPIOs, or are they open/hardcoded on the PCB.

SB


Replies (6)

RE: FPGA serial programming interface - Added by Alexander Block almost 6 years ago

SB,

The FPGA is configured using 8 bit parallel slave select mode via the EMIFA bus connection to the Omap L138 processor.

Please reference this Wiki page for information about programming the FPGA: https://support.criticallink.com/redmine/projects/arm9-platforms/wiki/Programming_the_FPGA

Alex

RE: FPGA serial programming interface - Added by stephan berner almost 6 years ago

I understand that. However, I would like to configure the FPGA in serial slave mode.

RE: FPGA serial programming interface - Added by Alexander Block almost 6 years ago

SB,

I apologize.

The M0 and M1 FPGA pins are tied to resistors on the module to GND (M0) and 3.3V (M1) forcing the mode to Slave SelectMAP. The CCLK and DIN connections are tied to the OMAP-L138 processor.

It may be possible to "remove" the M0 and M1 resistors which would allow the internal default pull-up signals to allow the Slave Serial mode to be used (Note 4 - Page 23: http://www.xilinx.com/support/documentation/user_guides/ug380.pdf). I will work with some of our engineering staff to see if there are any further considerations.

Alex

RE: FPGA serial programming interface - Added by Alexander Block almost 6 years ago

I discussed this with one of our engineers here and it may be possible however they is likely a bit of work required in order to make it functional.

As well he wanted to know what the reasoning is behind programming the FPGA in the Slave Serial mode vs the current 8-bit parallel?

Thank you.

RE: FPGA serial programming interface - Added by stephan berner almost 6 years ago

Thanks for the information.

We are prototyping a future product and due to pin count restrictions we can't use parallel slave mode.

How are the two resistors called, Rxxx and Ryyy ?

RE: FPGA serial programming interface - Added by Alexander Block almost 6 years ago

We are happy to provide further assistance with this issue, however I will be contacting you directly at your e-mail address that is on-file.

Thank you.

Alex

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