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jtag ftdi: sample TDO on falling edge of TCK 80/3180/13
authorMatthias Welwarsky <matthias@welwarsky.de>
Tue, 19 Jan 2016 21:36:54 +0000 (22:36 +0100)
committerAndreas Fritiofson <andreas.fritiofson@gmail.com>
Sat, 13 Feb 2016 23:04:49 +0000 (23:04 +0000)
commite026d3ff1bf31f531bf97bc151b4693a6a52f8e7
treeb4e41251ac76c393729935d183cb321c24191759tree | snapshot
parentde239311629e684e88a2e60d9d19c77d1fc35ae5commit | diff
jtag ftdi: sample TDO on falling edge of TCK

Due to signal propagation delays, sampling TDO on rising TCK can become
quite peculiar at fast TCK rates. However, FTDI chips offer a possiblity
to sample TDO on falling edge. With this change, stable operation can be
achieved at 30MHz clock even over 10cm ribbon cable.

Change-Id: Icaf240535dae15512e3c60a944e22a5fbc1b0b06
Signed-off-by: Matthias Welwarsky <matthias@welwarsky.de>
Reviewed-on: http://openocd.zylin.com/3180
Tested-by: jenkins
Reviewed-by: Paul Fertser <fercerpav@gmail.com>
doc/openocd.texi diff | blob | history
src/jtag/drivers/ftdi.c diff | blob | history
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