Datasheet
4−20
4.34 Diagnostic Register
The diagnostic register is provided for internal TI test purposes. It is a read/write register, but only 00h should be
written to it. See Table 4−12 for a complete description of the register contents.
Bit 7 6 5 4 3 2 1 0
Default 0 1 1 0 0 0 0 0
Register: Diagnostic
Offset: 93h
Type: Read/Write
Default: 60h
Table 4−12. Diagnostic Register Description
BIT SIGNAL TYPE FUNCTION
7 TRUE_VAL RW
This bit defaults to 0b. This bit is encoded as:
0 = Reads true values in PCI vendor ID and PCI device ID registers (default)
1 = Reads all 1s in reads from the PCI vendor ID and PCI device ID registers
6 RSVD R Reserved. Bit 6 returns 1b when read.
5 CSC RW
CSC interrupt routing control
0 = CSC interrupts routed to PCI if ExCA 803 bit 4 = 1b
1 = CSC interrupts routed to PCI if ExCA 805 bits 7−4 = 0000b (default)
In this case, the setting of ExCA 803 bit 4 is a don’t care.
4 DIAG4 RW Diagnostic RETRY_DIS. Delayed transaction disable.
3 DIAG3 RW Diagnostic RETRY_EXT. Extends the latency from 16 to 64.
2 DIAG2 RW Diagnostic DISCARD_TIM_SEL_CB. Set = 2
10
, reset = 2
15
.
1 DIAG1 RW Diagnostic DISCARD_TIM_SEL_PCI. Set = 2
10
, reset = 2
15
.
0 STDZVEN RW
Standardized zoomed video register model enable.
0 = Enable the standardized zoomed video register model (default)
1 = Disable the standardized zoomed video register model
4.35 Capability ID Register
The capability ID register identifies the linked list item as the register for PCI power management. The register returns
01h when read, which is the unique ID assigned by the PCI SIG for the PCI location of the capabilities pointer and
the value.
Bit 7 6 5 4 3 2 1 0
Default 0 0 0 0 0 0 0 1
Register: Capability ID
Offset: A0h
Type: Read-only
Default: 01h
4.36 Next-Item Pointer Register
The next-item pointer register indicates the next item in the linked list of the PCI power-management capabilities.
Because the controller function includes only one capabilities item, this register returns 00h when read.
Bit 7 6 5 4 3 2 1 0
Default 0 0 0 0 0 0 0 0
Register: Next-item pointer
Offset: A1h
Type: Read-only
Default: 00h