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, <[email protected]> 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:* '[email protected]' > *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:* '[email protected]' > *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 >
