PCI1620 Datasheet, PDF (98/164 Pages) Texas Instruments – DUAL-SOCKET PL CARD AND UITRAMEDIA CONTROLLER

4.42 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 4−17 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:
Offset:
Type:
Default:
Diagnostic
93h (functions 0, 1)
Read/Write
60h
Table 4−17. Diagnostic Register Description
BIT
SIGNAL
TYPE
FUNCTION
This bit defaults to 0. This bit is encoded as:
7†
TRUE_VAL
RW
0 = Reads true values in PCI vendor ID and PCI device ID registers (default)
1 = Returns all 1s to reads from the PCI vendor ID and PCI device ID registers
6
RSVD
R Reserved. This bit is read-only and returns 1 when read.
CSC interrupt routing control
5
CSC
RW
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 = 210, reset = 215.
1†
DIAG1
RW Diagnostic DISCARD_TIM_SEL_PCI. Set = 210, reset = 215.
Zoomed-video enable
0
STDZV_EN
RW
0 = Enable new ZV register model (default)
1 = Disable new ZV register mode
† _{This bit is global and is accessed only through function 0.}
4−30