Datasheet

4−24
4.34 Diagnostic Register
The diagnostic register is provided for internal TI test purposes. It is a read/write register, but only 0s should be written
to it. See Table 4−13 for a complete description of the register contents.
Bit 7 6 5 4 3 2 1 0
Name Diagnostic
Type RW R RW RW RW RW RW RW
Default 0 1 1 0 0 0 0 0
Register: Diagnostic
Offset: 93h (functions 0, 1)
Type: Read/Write
Default: 60h
Table 4−13. Diagnostic Register Description
BIT SIGNAL TYPE FUNCTION
7
†
TRUE_VAL RW
This bit defaults to 0. 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 1 when read.
5 CSC RW
CSC interrupt routing control
0 = CSC interrupts routed to PCI if ExCA 803 bit 4 = 1
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.
†
This bit is global and is accessed only through function 0.