
Chapter 4
Registers
297
24674
Rev. 3.00
April 2003
AMD-8111 HyperTransport I/O Hub Data Sheet
AMD Preliminary Information
USB Interrupt Enable Register
ECAP38
Default:
Bits
31:6
5
0000_0000h.
Description
Reserved. Hardwired to 0000000h.
IAAE. Interrupt on Async Advance Enable
.
Read-write. When this bit is a one, and the Interrupt on Async Advance bit in the ECAP34 register is
a one, the host controller issues an interrupt at the next interrupt threshold. The interrupt is
acknowledged by software clearing the Interrupt on Async Advance bit.
HSEE. Host System Error Enable
.
Read-write. When this bit is a one, and the Host System Error Status bit in the ECAP34 register is a
one, the host controller issues an interrupt. The interrupt is acknowledged by software clearing the
Host System Error bit.
FLRE. Frame List Rollover Enable
.
Read-write. When this bit is a one, and the Frame List Rollover bit in the ECAP34 register is a one,
the host controller issues an interrupt. The interrupt is acknowledged by software clearing the Frame
List Rollover bit.
PCIE. Port Change Interrupt Enable
.
Read-write. When this bit is a one, and the Port Change Detect bit in the ECAP34 register is a one,
the host controller issues an interrupt. The interrupt is acknowledged by software clearing the Port
Change Detect bit.
UEIE. USB Error Interrupt Enable
.
Read-write. When this bit is a one, and the USBERRINT bit in the ECAP34 register is a one, the host
controller issues an interrupt at the next interrupt threshold. The interrupt is acknowledged by
software clearing the USBERRINT bit.
UIE. USB Interrupt Enable
.
Read-write. When this bit is a one, and the USBINT bit in the ECAP34 register is a one, the host
controller issues an interrupt at the next interrupt threshold. The interrupt is acknowledged by
software clearing the USBINT bit.
Attribute:
See below.
USB Frame Index Register
ECAP3C
Default:
Bits
31:14 Reserved. Hardwired to 0000h.
13:0
FIND. Frame Index
.
Read-write. The value in this register increments at the end of each time frame (e.g., micro-frame).
Bits [N:3] are used for the Frame List current index. This means that each location of the frame list is
accessed 8 times (frames or micro-frames) before moving to the next index.
ECAP30[FLS] Number ElementsN
00b
(1024)
01b
(512)
10b
(256)
11b
Reserved
0000_0000h.
Description
Attribute: See below (only doubleword access supported).
4
3
2
1
0
12
11
10