TUSB7340 datasheet(55/122 Pages) TI2

55 / 122 page

Table 8-54. Device Capabilities Register Description (continued)

BIT

FIELD NAME

ACCESS

DESCRIPTION

4:3

PFS

Phantom Functions Supported. This field is read only 00b indicating that

function numbers are not used for phantom functions.

2:0

MPSS

Max Payload Size Supported. This field indicates the maximum payload

size that the device can support for TLPs. This field is encoded as 011b

indicating the Max Payload size for a TLP is 1 Kbyte.

8.1.40 Device Control Register

The Device Control Register controls PCI Express device specific parameters.

PCI register offset: 78h

Default value: 2810h

Table 8-55. PCI Register 78h

Bit

No.

Reset

State

Table 8-56. Device Control Register Description

BIT

FIELD NAME

ACCESS

DESCRIPTION

INITIATE_FLR

Initiate Function Level Reset. A write of 1b initiates Function Level Reset

to the Function. The value read by software from this bit is always 0b.

14:12

MRRS

Max Read Request Size. This field is programmed by host software

to set the maximum size of a read request that the TUSB73X0 can

generate. This field is encoded as:

000 – 128B

001 – 256B

010 – 512B (default)

011 – 1024B

100 – 2048B101 – 4096B

110 – Reserved

111 – Reserved

ENS

Enable No Snoop. Controls the setting of the No Snoop flag within the

TLP header for upstream memory transactions mapped to any traffic

class mapped to a virtual channel other than VC0 through the Upstream

Decode Windows.

0 – No snoop field is 0

1 – No snoop field is 1 (default)

APPE

Auxiliary Power PM Enable. This bit is only reset by a Global Reset.

PFE

Phantom Function Enable. Because the TUSB73X0 does not support

phantom functions this bit is read only zero.

ETFE

Extended Tag Field Enable.

7:5

MPS

Max Payload Size.

ERO

Enable Relaxed Ordering.

URRE

Unsupported Request Reporting Enable.

FERE

Fatal Error Reporting Enable.

NFERE

Non-Fatal Error Reporting Enable.

CERE

Correctable Error Reporting Enable.

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TUSB7320, TUSB7340

SLLSE76Q – MARCH 2011 – REVISED MARCH 2024

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