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| -rw-r--r-- | doc/openocd.texi | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/doc/openocd.texi b/doc/openocd.texi index 9f2e8227..6d88d832 100644 --- a/doc/openocd.texi +++ b/doc/openocd.texi @@ -1509,9 +1509,12 @@ Tap Uses: parameters'', the required parameters are: @comment START REQUIRED @itemize @bullet -@item @b{-irlen NUMBER} - the length in bits of the instruction register -@item @b{-ircapture NUMBER} - the ID code capture command. -@item @b{-irmask NUMBER} - the corresponding mask for the ir register. +@item @b{-irlen NUMBER} - the length in bits of the instruction register, mostly 4 or 5 bits. +@item @b{-ircapture NUMBER} - the IDCODE capture command, usually 0x01. +@item @b{-irmask NUMBER} - the corresponding mask for the IR register. For +some devices, there are bits in the IR that aren't used. This lets you mask +them off when doing comparisons. In general, this should just be all ones for +the size of the IR. @comment END REQUIRED @end itemize An example of a FOOBAR Tap |