someone asked>> [something like: But what would a TCL user expect].
Hmm,
What does not happen to day, is the ability to "scan out" data bits and
capture them in TCL.
I think the following would be helpful
# Goto this state by any means desired, via any random path, really only
good for RESET
jtag gotostate STATENAME
# Goto next state, must be exactly 1 clock/tms step away, can list
multiple states
jtag nextstate STATENAME [... more STATENAMEs]
# Tell this tap to do a specific scan type
# Tapstate must be CAPTUREDR or CAPTUREIR otherwise error
jtag scan -type DR|IR -bitlen NBITS -iarray ARRAYNAME -oarray
ARRAYNAME -endstate NAME
# Simplistic "ir scans" - of only a few bits
jtag scan -type IR -bitlen 5 -value VALUE
# Run clocks in RESET, IRPAUSE, DRPAUSE, or IDLE/RUN state
jtag idleclocsk NCLOCKS
# Finally,
jtag execute
# NOTE: The above commands are "global"
# and do not account for any tap in bypass, their view is
# effectively at the end of the dongle cable.
# Wiggle "TRST" and/or SRST pins
jtag set TRST 0
jtag set TRST 1
jtag set SRST 0
jtag set SRST 1
Examples
jtag set TRST 0
jtag set SRST 0
sleep 500
jtag set TRST 1
jtag set SRST 1
jtag gotostate RESET
jtag gotostate SHIFTIR
# ? not sure here, the idea is to put the 5 bit value 0x0c in the IR
register
jtag scan -type IR -bitlen 5 -value 0x0c -endstate EXITIR
# Scan out, 35 bits into MYBITS - with, TDI = 1 during the shift.
jtag gotostate CAPTUREDR
jtag scan -type DR -bitlen 35 -tdi 1 -oarray MYBITS -endstate EXITDR
==
-Duane
==
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