CS5535 datasheet(271/555 Pages) NSC

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USB Register Descriptions (Continued)

5.5.3.3

Command (USBC_PCI_CMD)

5.5.3.4

Status (USBC_PCI_STS)

Index

04h

Type

R/W

Reset Value

0000h

USBC_PCI_CMD Register Map

9876

5432

RSVD

FB2B_

SERR

WS_

CTL

PAR

VGA_

SNP_

MEMW

_INV

SPC_

CYC

MSTR_

MEM

USBC_PCI_CMD Bit Descriptions

Bit

Name

Description

15:10

RSVD

Reserved. Set to 0.

FB2B_EN (RO)

Fast Back-to-Back Enable (Read Only). USB only acts as a master to a single device,

so this functionality is not needed. It is always disabled (must always be set to 0).

SERR

System Error. USB asserts SERR# when it detects an address parity error.

0: Disable; 1: Enable.

7WS_CTL

Wait Cycle Control. USB does not need to insert a wait state between the address and

data on the AD lines. It is always disabled (bit is set to 0).

6PAR

Parity Error. USB asserts PERR# when it is the agent receiving data and it detects a

data parity error. 0: Disable; 1: Enable.

5VGA_SNP_EN

(RO)

VGA Palette Snoop Enable (Read Only). USB does not support this function. It is

always disabled (bit is set to 0).

4MEMW_INV

Memory Write and Invalidate: Allow USB to run Memory Write and Invalidate com-

mands. 0: Disable; 1: Enable.

The Memory Write and Invalidate commands only occur if the cache line size is set to

32 bytes and the memory write is exactly one cache line.

This bit is ignored by the GeodeLink Adapter and hence the setting is a ‘don’t care’.

SPC_CYC

Special Cycles. USB does not run special cycles on PCI. It is always disabled (bit is

set to 0).

MSTR_EN

PCI Master Enable. Allow USB to run PCI master cycles. 0: Disable; 1: Enable.

1MEM

Memory Space. Allow USB to respond as a target to memory cycles. 0: Disable; 1:

Enable.

0IO

I/O Space. Allow USB to respond as a target to I/O cycles. 0: Disable; 1: Enable.

Index

06h

Type

R/W

Reset Value

0280h

USBC_PCI_STS Register Map

9876

5432

PAR_

ERR

SERR_

STS

RCVD_

MSTR_

ABT_

STS

RCVD_

TRGT_

ABT_

STS

SIG_

TRGT_

ABT_

STS

DEVSEL_TIME DATA_

PAR

FB2B

RSVD

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