you have to read it complete:
CMP SELB & CMP SEL A
Configures the Comparison B and
Comparison A Options for compare
block >>>1<<<. The CMP SEL field of the RAM
configuration determines if the A or B
option is in effect for a given cycle.
Note: Compare block 0 can compare
only D0 and a masked value from A0.
Thanks for your reply.
I took for granted CMP SELA is for COMPARE BLOCK 0 and CMP SELB is for COMPARE BLOCK 1.
You are right, that is my misunderstanding.