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

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 4−18. 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.

 

 

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.

4−30

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Texas Instruments PCI7411, PCI7611, PCI7621, PCI7421 manual 18. Diagnostic Register Description