Predication support in CtrlBox

[yaqiz01]

Add predication unit in ctrlbox to support data dependent pop on fifo. Currently assume each PCU has two such predication unit dedicated for accumulation and fifo that are hardwired. If more needed change this to a pool of predication units that can be mapped. The predication has # inputs = # counters. And output of the predication unit is

(inputs, ops, consts, masks).zip { case (ctr, op, const, mask) => mask || (ctr op const) }.reduce { _ & _ }

• [x] spade simulation
• [x] mapping
• [ ] add plasma config for
• predication operation (comparator operation <, <=, ==, >=, >)
• constant to compare to
• counter index
• [ ] hardware support