Tcm Clock Gating - ARM ARM926EJ-S Technical Reference Manual

Tightly-Coupled Memory Interface
5.9

TCM clock gating

5-32
If the ARM926EJ-S processor is not currently running code from a TCM region, the
idle signal for that TCM (DRIDLE for DTCM, IRIDLE for ITCM) is asserted. This
indicates that a TCM access will not be performed in that cycle, enabling you to stop
the TCM clock. If no clock stopping is required, you can ignore the idle signals.
You can also use the idle signal to disable power to the RAMs if you require more
stringent power control. Removing the RAM power invalidates the RAM contents so
you must only do this if the TCMs are not being used and do not contain valid data.
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