4−30
4.40 Diagnostic Register
The diagnostic register is provided for internal TI test purposes. It is a read/write register, but only 0s must be written
to it. See Table 4−18 for a complete description of the register contents.
Bit 7 6 5 4 3 2 1 0
Name Diagnostic
Type RW RRW 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 4−18. Diagnostic Register Description
BIT SIGNAL TYPE FUNCTION
7 ठTRUE_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 = 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.
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 ठDIAG4 RW Diagnostic RETRY_DIS. Delayed transaction disable.
3 ठDIAG3 RW Diagnostic RETRY_EXT. Extends the latency from 16 to 64.
2 ठDIAG2 RW Diagnostic DISCARD_TIM_SEL_CB. Set = 210, reset = 215.
1 ठDIAG1 RW Diagnostic DISCARD_TIM_SEL_PCI. Set = 210, reset = 215.
0 ‡ RSVD RW These bits are reserved. Do not change the value of these bits.
This bit is cleared only by the assertion of GRST.
§This bit is global and is accessed only through function 0.