Datasheet
xHCI Controller Registers (D20:F0)
434 Intel® Xeon® Processor D-1500 Product Family
Datasheet - Volume 1 of 4: Integrated Platform Controller Hub
March 2015
11.2.31 U2OCM1 - XHCI USB2 Overcurrent Mapping Register1
(USB xHCI—D20:F0)
Address Offset: C0–C3h Attribute: R/W, RO
Default Value: 00000000h Size: 32 bits
11.2.32 U2OCM2 - XHCI USB2 Overcurrent Mapping Register 2
(USB xHCI—D20:F0)
Address Offset: C4–C7h Attribute: R/W, RO
Default Value: 00000000h Size: 32 bits
Bit Description
31:24 OC3 Mapping Each bit position maps OC3# to a set of ports as follows: The OC3# pin is
ganged to the overcurrent signal of each port that has its corresponding bit set. It is software
responsibility to ensure that a given port‘s bit map is set only for one OC pin.
23:16 OC2 Mapping Each bit position maps OC2# to a set of ports as follows: The OC2# pin is
ganged to the overcurrent signal of each port that has its corresponding bit set. It is software
responsibility to ensure that a given port‘s bit map is set only for one OC pin.
15:8 OC1 Mapping Each bit position maps OC1# to a set of ports as follows: The OC1# pin is
ganged to the overcurrent signal of each port that has its corresponding bit set. It is software
responsibility to ensure that a given port‘s bit map is set only for one OC pin.
7:0 OC0 Mapping Each bit position maps OC0# to a set of ports as follows: The OC0# pin is
ganged to the overcurrent signal of each port that has its corresponding bit set. It is software
responsibility to ensure that a given port‘s bit map is set only for one OC pin.
Bit 3130292827262524
PortXXXXXX10
Bit 2322212019181716
PortXXXXXX10
Bit 151413121110 9 8
PortXXXXXX10
Bit 76543210
PortXXXXXX10
Bit Description
31:30 Reserved
29:24 OC7 Mapping Each bit position maps OC7 to a set of ports as follows: The OC7 pin is ganged
to the overcurrent signal of each port that has its corresponding bit set. It is software
responsibility to ensure that a given port‘s bit map is set only for one OC pin.
23:22 Reserved
21:16 OC6 Mapping Each bit position maps OC6 to a set of ports as follows: The OC6 pin is ganged
to the overcurrent signal of each port that has its corresponding bit set. It is software
responsibility to ensure that a given port‘s bit map is set only for one OC pin.
15:14 Reserved
Bit 292827262524
PortXXXX54
Bit 212019181716
PortXXXX54