USRP custom registers

Hello,

We are working on a custom FPGA build that is going to need more then
the 32 registers available for user’s builds. I looked at
fpga_regs_standard.v/fpga_regs_common.v and
seems that the registers 96-127 are not being used. Is there a problem
in using these registers ? Or in extending the registers address space
beyond 127?

Thanks.

On Wed, Sep 16, 2009 at 04:40:33PM -0300, Tiago Rogério Mück wrote:

Hello,

We are working on a custom FPGA build that is going to need more then
the 32 registers available for user’s builds. I looked at
fpga_regs_standard.v/fpga_regs_common.v and
seems that the registers 96-127 are not being used. Is there a problem
in using these registers ? Or in extending the registers address space
beyond 127?

You should be good up to 127. The host code, the FX2 firmware and the
FPGA code limit the register number to 7-bits (1 bit is used to code
for read vs write in the SPI transaction that is used to read or write
the FPGA registers).

Eric

Good to hear that.

Thank you.

2009/9/16 Eric B. [email protected]:

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