The two GPIO banks are labelled "led" and "gpio" in the yellow block. You do not need to set any direction buffers as with ROACH1, though as a result, the voltage levels are somewhat different as they come straight out of the FPGA (lower, LVCMOS15 if memory serves).
"led" is the 8 bit GPIO bank that is hard wired together with the eight onboard LEDs, aka P15/FPGA GPIO/LEDs. "gpio" is the 8 bit bank P13/FPGA GPIO. I have noticed that the schematics on the wiki are outdated (rev 0) and that the ROACH2 stuff still isn't up on github (https://github.com/ska-sa/). I will chat with the relevant people to try'n get this fixed later today so that you have the actual schematics. Jason On 08 Feb 2012, at 21:33, Nimish Sane wrote: > Hi all, > > Is there any documentation for ROACH 2 specific GPIO interface? If not, can > someone throw light on how to configure the GPIO yellow block for ROACH 2. > From the available configurations in the yellow block, I understand that > there are no GPIO groups A and B, and need for direction selector yellow > blocks as in Roach 1. The image of ROACH 2 GPIO header on wiki shows there > are two groups with pins 0 -7 on one header and 8-15 on the other. Are there > any specifications/constraints on pins available for input/output and how > they should be configured? Also, do pin numbers in the yellow block match the > physical layout? > > I am using libraries available from the ska-sa fork. > > Thanks, > > Nimish
