Broadcom BCM5722 - Table 335: Functional Truth Table for the Combination of the Valid, Skip, and Pass Bits

BCM5722 Programmer’s Guide
10/15/07
Broadcom Corporation
Page 329 Flow-Through Queues Document 5722-PG101-R
Table 335 shows the functional truth table for the combination of the Valid, Skip, and Pass bits.
Table 335: Functional Truth Table for the Combination of the Valid, Skip, and Pass Bits
Valid Skip Pass Scenario
0 X X Head entry invalid.
100Waiting for CPU to peek the head entry.
101Waiting for WDMA to process the head entry.
110CPU has finished peeking the head entry, the head of RDIQ will be popped in the next cycle.
111Entry will be popped the next cycle. The WDMA might or might not have latched the head entry.
(Not recommended).