USRP custom registers

GNU Radio
1

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.

2

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

3

Good to hear that.

Thank you.

2009/9/16 Eric B. [email protected]: