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How fast are instructions executed by the CLA?

April 26, 2017CLA executed fast instructions

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How fast are instructions executed by the CLA?

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2803x CLA is clocked at the same rate as the main CPU (SYSCLKOUT) which is max 60Mhz. All CLA instructions are single cycle. While a discontinuity (branch/call/return) instruction itself is single cycle, the time for a discontinuity to complete depends on how many “delay slots” around the instruction are used. If no delay slots are used, then the discontinuity completes in 7 cycles (worst case) whether taken or not. A typical time would be 4 cycles taken/not taken. In this case slots before the instruction are used, but slots after are not.