Zynq UltraScale+ Devices Register Reference > Module Summary > PCIE_ATTRIB Module > ATTR_27 (PCIE_ATTRIB) Register
Register Name | ATTR_27 |
---|---|
Relative Address | 0x000000006C |
Absolute Address | 0x00FD48006C (PCIE_ATTRIB) |
Width | 32 |
Type | rwNormal read/write |
Reset Value | 0x00002138 |
Description | ATTR_27 |
This register should only be written to during reset of the PCIe block
Field Name | Bits | Type | Reset Value | Description |
---|---|---|---|---|
attr_dev_cap_role_based_error | 13 | rwNormal read/write | 0x1 | Indicates that compliant error reporting is supported |
attr_dev_cap_phantom_functions_support | 12:11 | rwNormal read/write | 0x0 | Phantom Function Support. Indicates number of Function Number that are reallocated to be Tag bits. |
attr_dev_cap_max_payload_supported | 10:8 | rwNormal read/write | 0x1 | Specifies maximum payload supported. Valid settings are: 0- 128 bytes, 1- 256 bytes, 2- 512 bytes, 3- 1024 bytes. Transferred to the Device Capabilities register. The values: 4-2048 bytes, 5- 4096 bytes are not supported |
attr_dev_cap_function_level_reset_capable | 7 | rwNormal read/write | 0x0 | Function Level Reset Capability. Indicates support for option FLR is allowed. Only applies to endpoints. |
Reserved | 6 | rwNormal read/write | 0x0 | reserved. |
attr_dev_cap_endpoint_l1_latency | 5:3 | rwNormal read/write | 0x7 | Endpoint L1 Acceptable Latency. Records the latency that the endpoint can withstand on transitions from L1 state to L0 (if L1 state supported). Valid settings are: 0h less than 1us, 1h 1 to 2us, 2h 2 to 4us, 3h 4 to 8us, 4h 8 to 16us, 5h 16 to 32us, 6h 32 to 64us, 7h more than 64us. For Endpoints only. Must be 0h for other devices. |
attr_dev_cap_endpoint_l0s_latency | 2:0 | rwNormal read/write | 0x0 | Endpoint L0s Acceptable Latency. Records the latency the endpoint can withstand on transitions from L0s state to L0. Valid settings are: 0h less than 64ns, 1h 64 to 128ns, 2h 128 to 256ns, 3h 256 to 512ns, 4h 512ns to 1us, 5h 1 to 2us, 6h 2 to 4 us, 7h more than 4us. For Endpoints only. Must be 0h for other devices. |