XIO2001IPNP datasheet(75/145 Pages) TI2

75 / 145 page

Table 8-45. Control and Diagnostic Register 0 Description (continued)

BIT

FIELD NAME

ACCES

DESCRIPTION

1(1)

RSVD

Reserved. Bit 1 defaults to 0b. If this register is programmed via EEPROM or another

mechanism, the value written into this field must be 0b.

0(1)

FORCE_CLKREQ

Force CLKREQ. When this bit is set, the bridge will force the CLKREQ output to always be

asserted. The default setting for this bit is 1b.

(1)

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

8.4.63 Control and Diagnostic Register 1

The contents of this register are used for monitoring status and controlling behavior of the bridge. See Table

8-46 for a complete description of the register contents. It is recommended that all values within this register be

left at the default value. Improperly programming fields in this register may cause interoperability or other

problems.

PCI register offset:

C4h

Read/Write

Default value:

0012 0108h

BIT NUMBER

RESET STATE

BIT NUMBER

RESET STATE

Table 8-46. Control and Diagnostic Register 1 Description

BIT

FIELD NAME

ACCESS

DESCRIPTION

32:21

RSVD

Reserved. Returns 000h when read.

20:18(1) L1_EXIT_LAT_A

SYNC

L1 exit latency for asynchronous clock. When bit 6 (CCC) of the link control register (offset 80h,

see Section 8.4.54) is set, the value in this field is mirrored in bits 17:15 (L1_LATENCY) field in

the link capabilities register (offset 7Ch, see Section 8.4.53). This field defaults to 100b.

17:15(1) L1_EXIT_LAT_C

OMMON

L1 exit latency for common clock. When bit 6 (CCC) of the link control register (offset 80h, see

Section 8.4.54) is clear, the value in this field is mirrored in bits 17:15 (L1_LATENCY) field in

the link capabilities register (offset 7Ch, see Section 8.4.53). This field defaults to 100b.

14:11(1) RSVD

Reserved. Bits 14:11 default to 0000b. If this register is programmed via EEPROM or another

mechanism, the value written into this field must be 0000b.

10(1)

SBUS_RESET_M

ASK

Secondary bus reset bit mask. When this bit is set, the bridge masks the reset caused by bit 6

(SRST) of the bridge control register (offset 3Eh, see Section 8.4.30). This bit defaults to 0b.

9:6(1)

L1ASPM_TIMER

L1ASPM entry timer. This field specifies the value (in 512-ns ticks) of the L1ASPM entry timer.

This field defaults to 0100b.

5:2(1)

L0s_TIMER

L0s entry timer. This field specifies the value (in 62.5-MHz clock ticks) of the L0s entry timer.

This field defaults to 0010b.

1:0(1)

RSVD

Reserved. Bits 1:0 default to 00b. If this register is programmed via EEPROM or another

mechanism, then the value written into this field must be 00b.

(1)

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

8.4.64 Control and Diagnostic Register 2

The contents of this register are used for monitoring status and controlling behavior of the bridge. See Table

8-47 for a complete description of the register contents. It is recommended that all values within this register be

left at the default value. Improperly programming fields in this register may cause interoperability or other

problems.

PCI register offset:

C8h

Read/Write

Default value:

3214 2000h

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XIO2001

SCPS212J – MAY 2009 – REVISED JANUARY 2021

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