Device Capabilities (DCAP) – Offset 44 - 1.2 - ID:615146 | Intel® 400 Series Chipset On-Package Platform Controller Hub

Intel® 400 Series Chipset On-Package Platform Controller Hub

Online Register Database

ID	Date	Version	Classification
615146	08/09/2019	1.2	Public

Device Capabilities (DCAP) – Offset 44

Bit Range	Default	Access	Field Name and Description
30:29	-	-	Reserved
28	0b	RO	Function Level Reset Capable (FLRC) Not supported in Root Ports
27:26	00b	RO	Captured Slot Power Limit Scale (CSPS) Not supported
25:18	00h	RO	Captured Slot Power Limit Value (CSPV) Not supported
17:16	-	-	Reserved
15	1b	RO	Role Based Error Reporting (RBER) When Set, this bit indicates that the Function implements the functionality originally defined in the Error Reporting ECN for PCI Express Base Specification, Revision 1.0a, and later incorporated into PCI Express Base Specification, Revision 1.1. This bit must be Set by all Functions conforming to the ECN, PCI Express Base Specification, Revision 1.1, or subsequent PCI Express Base Specification revisions.
14:12	-	-	Reserved
11:9	000b	RO	Endpoint L1 Acceptable Latency (E1AL) Reserved for root ports.
8:6	000b	RO	Endpoint L0 Acceptable Latency (E0AL) Reserved for Root port.
5	0b	RO	Extended Tag Field Supported (ETFS) The root port never needs to initiate a transaction as a Requester with the Extended Tag bits being set. This bit does not affect the root port's ability to forward requests as a bridge as the root port always supports forwarding requests with extended tags.
4:3	00b	RO	Phantom Functions Supported (PFS) No phantom functions supported
2:0	001b	RW/O	Max Payload Size Supported (MPS) BIOS should write to this field during system initialization. Only Max Payload Size of up to 256B is supported. Programming this field to any values other than 128B max payload size will result in aliasing to 128B max payload size. 000b: 128 bytes max payload size. 001b: 256 bytes max payload size. 010b: 512 bytes max payload size. 011b: 1024 bytes max payload size. 100b: 2048 bytes max payload size. 101b: 4096 bytes max payload size. 110b: Reserved. 111b: Reserved. This field applies only to the PCIe link interface.