XIO2213A_10 Datasheet, PDF (68/186 Pages) Texas Instruments – PCI Express to 1394b OHCI with 3-Port PHY

XIO2213A PCI Express to 1394b OHCI with 3-Port PHY
SCPS183A – OCTOBER 2007 – REVISED MARCH 2008
www.ti.com
4.51 Device Control Register
The device control register controls PCI Express device specific meters. See Table 4-27 for a complete
description of the register contents.
PCI register offset:
98h
Register type:
Read-only, Read/Write
Default value:
2800h
BIT NUMBER
RESET STATE
15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
0
0
0
1
0
1
0
0
0
0
0
0
0
0
0
0
0
BIT
15
14:12
11
10
9
8
7:5
4
3
FIELD NAME
CFG_RTRY_ENB
MRRS
ENS
APPE
PFE
ETFE
MPS
ERO
URRE
Table 4-27. Device Control Register Description
ACCESS
RW
RW
RW
RW
R
R
RW
R
RW
DESCRIPTION
Configuration retry status enable. When this read/write bit is set to 1b, the bridge returns a
completion with completion retry status on PCI Express if a configuration transaction
forwarded to the secondary interface did not complete within the implementation specific
time-out period. When this bit is set to 0b, the bridge does not generate completions with
completion retry status on behalf of configuration transactions. The default value of this bit is
0b.
Maximum read request size. This field is programmed by host software to set the maximum
size of a read request that the bridge can generate. The bridge uses this field in conjunction
with the cache line size register (offset 0Ch, see Section 7.6) to determine how much data to
fetch on a read request. This field is encoded as:
000 = 128B
001 = 256B
010 = 512B (default)
011 = 1024B
100 = 2048B
101 = 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 (VC) other than
VC0 through the upstream decode windows.
0 = No snoop field is 0b
1 = No snoop field is 1b (default)
Auxiliary power PM enable. This bit has no effect in the bridge.
0 = AUX power is disabled (default)
1 = AUX power is enabled
Phantom function enable. Since the bridge does not support phantom functions, this bit is
read-only 0b.
Extended tag field enable. Since the bridge does not support extended tags, this bit is
read-only 0b.
Maximum payload size. This field is programmed by host software to set the maximum size of
posted writes or read completions that the bridge can initiate. This field is encoded as:
000 = 128B (default)
001 = 256B
010 = 512B
011 = 1024B
100 = 2048B
101 = 4096B
110 = Reserved
111 = Reserved
Enable relaxed ordering. Since the bridge does not support relaxed ordering, this bit is
read-only 0b.
Unsupported request reporting enable. If this bit is set, then the bridge sends an
ERR_NONFATAL message to the root complex when an unsupported request is received.
0 = Do not report unsupported requests to the root complex (default)
1 = Report unsupported requests to the root complexd
68
Classic PCI Configuration Space
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