XIO2000AI datasheet(100/159 Pages) TAOS

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Classic PCI Configuration Space

April 2007 Revised October 2008

SCPS155C

4.70 Arbiter Request Mask Register

The arbiter request mask register enables and disables support for requests from specific masters on the

secondary bus. The arbiter request mask register also controls if a request input is automatically masked on

an arbiter time-out. See Table 4−44 for a complete description of the register contents.

PCI register offset:

DDh

Read/Write

Default value:

00h

BIT NUMBER

RESET STATE

Table 4−44. Arbiter Request Mask Register Description

BIT

FIELD NAME

ACCESS

DESCRIPTION

7†

ARB_TIMEOUT

Arbiter time-out. This bit enables the arbiter time-out feature. The arbiter time-out is defined as

the number of PCI clocks after the PCI bus has gone idle for a device to assert FRAME before

the arbiter assumes the device will not respond.

0 = Arbiter time disabled (default)

1 = Arbiter time-out set to 16 PCI clocks

6†

AUTO_MASK

Automatic request mask. This bit enables automatic request masking when an arbiter time-out

occurs.

0 = Automatic request masking disabled (default)

1 = Automatic request masking enabled

5†

REQ5_MASK

Request 5 (REQ5) mask. Setting this bit forces the internal arbiter to ignore requests signal on

request input 5.

0 = Use request 5 (default)

1 = Ignore request 5

4†

REQ4_MASK

Request 4 (REQ4) mask. Setting this bit forces the internal arbiter to ignore requests signal on

request input 4.

0 = Use request 4 (default)

1 = Ignore request 4

3†

REQ3_MASK

Request 3 (REQ3) mask. Setting this bit forces the internal arbiter to ignore requests signal on

request input 3.

0 = Use request 3 (default)

1 = Ignore request 3

2†

REQ2_MASK

Request 2 (REQ2) mask. Setting this bit forces the internal arbiter to ignore requests signal on

request input 2.

0 = Use request 2 (default)

1 = Ignore request 2

1†

REQ1_MASK

Request 1 (REQ1) mask. Setting this bit forces the internal arbiter to ignore requests signal on

request input 1.

0 = Use request 1 (default)

1 = Ignore request 1

0†

REQ0_MASK

Request 0 (REQ0) mask. Setting this bit forces the internal arbiter to ignore requests signal on

request input 0.

0 = Use request 0 (default)

1 = Ignore request 0

† These bits are reset by a PCI Express reset (PERST), a GRST, or the internally-generated power-on reset.

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