Ohci Operational Registers (Mem_Reg) - AMD SB600 Technical Reference Manual

Target Timeout Control (OHCI0 only) – RW - 32 bits - [PCI_Reg : 74h]
Field Name
Retry counter
Reserved
Timeout Timer
Field Name
MSI USB
Next Item Pointer
MSI Control Out
Reserved
MSI Control
Reserved
Field Name
MSI Address
Field Name
MSI Data
2.2.1.2

OHCI Operational Registers (MEM_Reg)

The Host Controller (HC) contains a set of on-chip operational registers, which are mapped into a non-
cacheable portion of the system addressable space. These registers are used by the Host Controller Driver
(HCD) and should be read and written as Dwords.
Reserved bits may be allocated in future releases and should not be assumed to contain 0. The Host
Controller Driver should always preserve the value(s) of the reserved field. When a write to set/clear register
is written, bits written to reserved fields should be 0.
HcControlCurrentED
©2008 Advanced Micro Devices, Inc.
AMD SB600 Register Reference Manual
Bits Default
7:0 FFh
23:8 0000h
31:24 80h
MSI Control – RW - 32 bits - [PCI_Reg : D0h]
Bits Default
7:0 05h
15:8 00h
16 0b
19:17 0h
22:20 0h
31:23 00h
MSI Address – RW - 32 bits - [PCI_Reg : D4h]
Bits Default
31:0 0h
MSI Data – RW - 16 bits - [PCI_Reg : D8h]
Bits Default
15:0 0h
Register Name
HcRevision
HcControl
HcCommandStatus
HcInterruptStatus
HcInterruptEnable
HcInterruptDisable
HcHCCA
HcPeriodCurrentED
HcControlHeadED
HcBulkHeadED
Description
Counter to control the purge of the delay queue when the
host controller does not return the ack. After the counter
expires the transaction is target aborted.
The retry counter can be disabled by writing 00h in this
Register.
Reserved
Timer to control the purge of the delay queue when the
master that has initiated the access does not return to
complete the transaction. After the timer expires the queue
is invalidated and the next transaction is serviced.
Description
MSI USB ID. Read only.
Pointer to next capability structure
Set to 1 to disable IRQ. Use MSI instead.
Reserved
MSI control field
Reserved
Description
System-specified message address.
Description
System-specified message.
OCHI USB 1.1 and EHCI USB 2.0 Controllers
Proprietary
Offset Address
0h
4h
8h
Ch
10h
14h
18h
1Ch
20h
24h
28h
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