PCI1221 datasheet(65/123 Pages) TI

65 / 123 page

PCI1221 GHK/PDV

PC CARD CONTROLLERS

SCPS042 – JULY 1998

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

retry status register

Bit

Name

Retry status

Type

R/W

R/C

Default

Retry status

Type:

Read only, read/write, read/clear (see individual bit descriptions)

Offset:

90h (functions 0, 1)

Default:

C0h

Description: The retry status register enables the retry timeout counters and displays the retry expiration

status. The flags are set when the PCI1221 retries a PCI or CardBus master request, and the

master does not return within 215 PCI clock cycles. The flags are cleared by writing a 1 to the

bit. These bits are expected to be incorporated into the PCI command, PCI status, and bridge

control registers by the PCI SIG. Access this register only through function 0. See Table 23 for

a complete description of the register contents.

Table 23. Retry Status Register

BIT

SIGNAL

TYPE

FUNCTION

PCIRETRY

R/W

PCI retry timeout counter enable. Bit 7 is encoded:

0 = PCI retry counter disabled

1 = PCI retry counter enabled (default)

6†

CBRETRY

R/W

CardBus retry timeout counter enable. Bit 6 is encoded:

0 = CardBus retry counter disabled

1 = CardBus retry counter enabled (default)

TEXP_CBB

R/C

CardBus target B retry expired. Write a 1 to clear bit 5.

0 = Inactive (default)

1 = Retry has expired

RSVD

Reserved. Bit 4 returns 0 when read.

3†

TEXP_CBA

R/C

CardBus target A retry expired. Write a 1 to clear bit 3.

0 = Inactive (default)

1 = Retry has expired.

RSVD

Reserved. Bit 2 returns 0 when read.

TEXP_PCI

R/C

PCI target retry expired. Write a 1 to clear bit 1.

0 = Inactive (default)

1 = Retry has expired.

RSVD

Reserved. Bit 0 returns 0 when read.

† These bits are global and should be accessed only through function 0.

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