Datasheet

TUSB7320, TUSB7340
www.ti.com SLLSE76E–MARCH 2011– REVISED JULY 2011
Table 4-54. Device Capabilities Register Description (continued)
Max Payload Size Supported. This field indicates the maximum payload
2:0 MPSS r 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.
4.40 Device Control Register
The Device Control Register controls PCI Express device specific parameters.
PCI register offset: 78h
Register type:Read/Write
Default value: 2810h
Table 4-55. PCI Register 78h
Bit
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
No.
Reset
0 0 1 0 1 0 0 0 0 0 0 1 0 0 0 0
State
Table 4-56. Device Control Register Description
Bit Field Name Access Description
Initiate Function Level Reset. A write of 1b initiates Function Level Reset
15 INITIATE_FLR rw
to the Function. The value read by software from this bit is always 0b.
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
14:12 MRRS rw
010 – 512B (default)
011 – 1024B
100 – 2048B101 – 4096B
110 – Reserved
111 – Reserved
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
11 ENS rw
Decode Windows.
0 – No snoop field is ‘0’
1 – No snoop field is ‘1’ (default)
10 APPE rw Auxiliary Power PM Enable. This bit is only reset by a Global Reset.
Phantom Function Enable. Since the TUSB73X0 does not support
9 PFE r
phantom functions this bit is read only zero.
8 ETFE rw Extended Tag Field Enable.
7:5 MPS rw Max Payload Size.
4 ERO rw Enable Relaxed Ordering.
3 URRE rw Unsupported Request Reporting Enable.
2 FERE rw Fatal Error Reporting Enable.
1 NFERE rw Non-Fatal Error Reporting Enable.
0 CERE rw Correctable Error Reporting Enable.
Copyright © 2011, Texas Instruments Incorporated CLASSIC PCI CONFIGURATION SPACE 47
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Product Folder Link(s): TUSB7320 TUSB7340