diff options
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/openocd.texi | 22 |
1 files changed, 12 insertions, 10 deletions
diff --git a/doc/openocd.texi b/doc/openocd.texi index 35c1b0d3..e4609e40 100644 --- a/doc/openocd.texi +++ b/doc/openocd.texi @@ -2309,19 +2309,9 @@ a JTAG TAP; that TAP should be named @code{sdma}. Every TAP requires at least the following @var{configparams}: @itemize @bullet -@item @code{-ircapture} @var{NUMBER} -@*The bit pattern loaded by the TAP into the JTAG shift register -on entry to the @sc{ircapture} state, such as 0x01. -JTAG requires the two LSBs of this value to be 01. -The value is used to verify that instruction scans work correctly. @item @code{-irlen} @var{NUMBER} @*The length in bits of the instruction register, such as 4 or 5 bits. -@item @code{-irmask} @var{NUMBER} -@*A mask for the IR register. -For some devices, there are bits in the IR that aren't used. -This lets OpenOCD mask them off when doing IDCODE comparisons. -In general, this should just be all ones for the size of the IR. @end itemize A TAP may also provide optional @var{configparams}: @@ -2340,6 +2330,18 @@ found when the JTAG chain is examined. These codes are not required by all JTAG devices. @emph{Repeat the option} as many times as required if more than one ID code could appear (for example, multiple versions). +@item @code{-ircapture} @var{NUMBER} +@*The bit pattern loaded by the TAP into the JTAG shift register +on entry to the @sc{ircapture} state, such as 0x01. +JTAG requires the two LSBs of this value to be 01. +By default, @code{-ircapture} and @code{-irmask} are set +up to verify that two-bit value; but you may provide +additional bits, if you know them. +@item @code{-irmask} @var{NUMBER} +@*A mask used with @code{-ircapture} +to verify that instruction scans work correctly. +Such scans are not used by OpenOCD except to verify that +there seems to be no problems with JTAG scan chain operations. @end itemize @end deffn |