DESCRIPTOR_BYPASS (0x090) - 4.0 English

QDMA Subsystem for PCI Express Product Guide (PG302)

Document ID
PG302
Release Date
2022-05-20
Version
4.0 English
Table 1. Descriptor Bypass (0x090)
Bit Default Access Type Field Description
[31:3] 0 NA Reserved
[2:1] 0 RW c2h_dsc_bypass C2H descriptor bypass loopback. When set, the C2H descriptor bypass-out port is looped back to the C2H descriptor bypass-in port.

2'b00: No bypass loopback.

2'b01: C2H MM desc bypass loopback and C2H Stream cache bypass loopback.

2'b10: C2H Stream Simple descriptor bypass loopback.

2'b11: H2C stream 64 byte descriptors are looped back to Completion interface.

[0] 0 RW h2c_dsc_bypass H2C descriptor bypass loopback. When set, the H2C descriptor bypass-out port is looped back to the H2C descriptor bypass-in port.

1'b1: H2C MM and H2C Stream descriptor bypass loopback

1'b0: No descriptor loopback