Overview

The TrbNetPriorityArbiter takes an INPUT_IN pattern and generate an RESULT_OUT pattern with only one bit enabled. Fixed priority is possible as well as round robin. The RESULT_OUT pattern is delayed by one CLK cycle, but it tries to look-forward and set one of the bits in advance, when INPUT_IN is zero.

Signal description

Line	Decription
INPUT_IN	Input pattern
RESULT_OUT	Output pattern
ENABLE	Set to 1, otherwise RESULT_OUT always 0
CTRL	see below

CTRL

PIN	Name	Description
0-7	RR_PATTERN	Round robin cyclic pattern
8	WRITE_MASK	Write the RR_PATTERN now
9	ROL	Enable rolling of the RR_PATTERN

Functional description

Round robin is used, when the first bit of the RR_PATTERN is enabled. In order to mix RR with fixed priority, the RR_PATTERN should be constructed with a mixture of 1's and 0's, and the ROL bit should be enabled. In this case, with each CLK cycle the pattern is rolled.

-- IngoFroehlich - 14 Feb 2007