XIO2001 datasheet(80/131 Pages) TI

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4.64 Subsystem Access Register

XIO2001 PCI Express™ to PCI Bus Translation Bridge

SCPS212B – MAY 2009 – REVISED JULY 2009

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BIT NUMBER

RESET STATE

BIT NUMBER

RESET STATE

Table 4-37. Control and Diagnostic Register 2 Description

BIT

FIELD NAME

ACCESS

DESCRIPTION

31:24(1) N_FTS_

N_FTS for asynchronous clock. When bit 6 (CCC) of the link control register (offset A0h, see

ASYNC_CLK

Section 4.53) is clear, the value in this field is the number of FTS that are sent on a transition from

L0s to L0. This field shall default to 32h.

23:16(1) N_FTS_

N_FTS for common clock. When bit 6 (CCC) of the link control register (offset A0h, see Section 4.53)

COMMON_

is set, the value in this field is the number of FTS that are sent on a transition from L0s to L0. This

CLK

field defaults to 14h.

15:13

PHY_REV

PHY revision number

12:8(1)

LINK_NUM

Link number

7(1)

EN_L2_PWR_

Enable L2 Power Savings

SAVE

0= Power savings not enabled when in L2

1= Power savings enabled when in L2.

RSVD

Reserved. Returns 0b when read.

5(1)

BAR0_EN

BAR 0 Enable.

0 = BAR at offset 10h is disabled (default)

1 = BAR at offset 10h is enabled

4:0(1)

RSVD

Reserved. Bits 4:0 default to 00000b. If this register is programmed via EEPROM or another

mechanism, then the value written into this field must be 00000b.

(1)

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

The contents of this read/write register are aliased to the subsystem vendor ID and subsystem ID registers

at PCI offsets 84h and 86h. See Table 4-38 for a complete description of the register contents.

PCI register offset:

D0h

Read/Write

Default value:

0000 0000h

BIT NUMBER

RESET STATE

BIT NUMBER

RESET STATE

Table 4-38. Subsystem Access Register Description

BIT

FIELD NAME

ACCESS

DESCRIPTION

31:16(1)

SubsystemID

Subsystem ID. The value written to this field is aliased to the subsystem ID register at PCI

offset 46h (see Section 4.33).

15:0(1)

SubsystemVendorID

Subsystem vendor ID. The value written to this field is aliased to the subsystem vendor ID

(1)

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

Classic PCI Configuration Space

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