Hi Glenn: Thanks for your help. The only thing I am surprised is I could read the snap_ram out by specifying the offset.
Cheers Wan ________________________________ From: G Jones [mailto:glenn.calt...@gmail.com] Sent: Wednesday, 27 May 2009 11:31 AM To: Cheng, Wan (ATNF, Marsfield) Cc: casper@lists.berkeley.edu Subject: Re: [casper] FW: How to use snap? Wan, The simplest operation of the snap block is as follows: Write 0 to the snap_ctrl file/register Write 7 to the snap_ctrl file/register to force enable, trigger, and write enable to be true (look under the snap mask to see how it works) Read snap_addr and wait for it to be snaplength - 1 (2047 by default). Usually this is essentially instantaneous, so no need to actually check unless you want to be sure the snap captured something. Read the snap_bram file, which should be snaplength 4-byte words (2048x4 bytes). Glenn On Tue, May 26, 2009 at 4:47 PM, <wan.ch...@csiro.au> wrote: Hi Henry: Could you please give me some idea about snap block? Thanks Wan ________________________________ From: Cheng, Wan (ATNF, Marsfield) Sent: Tuesday, 26 May 2009 4:44 PM To: 'casper-boun...@lists.berkeley.edu<mailto:casper-boun...@lists.berkeley.edu>' Subject: FW: How to use snap? Any idea? How can I access the whole block ram of snap from the CPU? Thanks Wan ________________________________ From: Cheng, Wan (ATNF, Marsfield) Sent: Monday, 25 May 2009 5:10 PM To: 'casper-boun...@lists.berkeley.edu<mailto:casper-boun...@lists.berkeley.edu>' Subject: How to use snap? Hi: I find the snap_addr of snap block is output only. Is there anyway, I can read out all the data from the snap block memory. Is there anyway I can specify the read address? Thanks Wan
