Drasko DRASKOVIC wrote:
On Wed, Apr 6, 2011 at 3:04 PM, Drasko DRASKOVIC
<[email protected]> wrote:
1.make sure to shift-in 1 in SPrAcc
Yes, this is done.
2. check the shit-out of SPrAcc -> must be one
Whe to check - before of after shifting in data ?
3. check the PrAcc CONTROL regsiter -> must be one
Yes, this is done in mips32_pracc.c, before calling
mips_ejtag_fastdata_scan() (refer to attached patch)
if SPrAcc shifted-out value is one and PrAcc is one
then the FASTDATA acccess succeeds
else failure
Just one important point to clarify over here, do we :
1) first check PrAcc in CONTROL reg *before* initiating FASTDATA acc
(like I implemented), or do we
2) try FASTDATA transfer without first checking PrAcc in CONTROL reg,
then check shifted-ot SPrAcc, and then in the end check PrAcc in
CONTROL, like you suggested ?
Basically, do we check PrAcc in CONTROL reg before or after FASTDATA
transaction ?
BR,
Drasko
Before.
Reading "Figure 6-16 Write Processor Access Example", the PrACC must be
checked first.
Regards,
Laurent Gauch
http://www.amontec.com
http://www.amontec.com/jtagkey.shtml
Amontec USB JTAG Cable solutions Amontec JTAGkey Amontec JTAGkey-2
Amontec JTAGkey-2P
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