Digital Discovery 48-Bit SPI

[bobql]

Hello,

I'm new to using Digilent tools.  I have been evaluating the SPI feature using Waveforms (ver 3.22.16 64bit) and am able to read and write from my slave device using 32-bit protocol.  Our new device will feature a 48-bit protocol, but I cannot get the protocol to work.  Is the tool limited to 32bit max?  If so, is there anyway to increase to 48bit?

Thanks,

Bob

[UPDATE]: Fixed the issue:

Instead of sending all 32bits like 0x12345678, I have to split it up 8bits at a time.

For Example:  instead of this command Write(48, 0x0620004D55aa );  I need to use Write(8, 0x06, 0x20, 0x00, 0x4D, 0x55, 0xaa );

Edited April 11 by bobql
Found solution myself.

[JColvin]

Hi @bobql,

I believe you'll only be able to get up to 40 bits wide:

but otherwise I believe the protocol tool itself is limited to 32 bits per word. I haven't tried outside of direct loopback, but I believe you should be able to send 32-bit words at a time. Splitting up the transaction into multiple 8-bit words would be the way to proceed for samples larger than that though.

Let me know if you have any questions.

Thanks,
JColvin