IDT 89HPES12T3G2, Preliminary User'S Manual

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IDT Configuration Registers
PES12T3G2 User Manual 8 - 38 January 28, 2013
Notes
SSIDSSVID - Subsystem ID and Subsystem Vendor ID (0x0F4)
Extended Configuration Space Access Registers
ECFGADDR - Extended Configuration Space Access Address (0x0F8)
ECFGDATA - Extended Configuration Space Access Data (0x0FC)
15:8 NXTPTR RWL 0x00 Next Pointer. This field contains a pointer to the next capability
structure.
31:16 Reserved RO 0x0 Reserved field.
Bit
Field
Field
Name
Type Default
Value
Description
15:0 SSVID RWL 0x0 SubSystem Vendor ID. This field identifies the manufacturer of
the add-in card or subsystem.
SSVID values are assigned by the PCI-SIG to insure uniqueness.
31:16 SSID RWL 0x0 Subsystem ID. This field identifies the add-in card or subsystem.
SSID values are assigned by the vendor.
Bit
Field
Field
Name
Type Default
Value
Description
1:0 Reserved RO 0x0 Reserved field.
7:2 REG RW 0x0 Register Number. This field selects the configuration register
number as defined by Section 7.2.2 of the PCI Express Base
Specification, Rev. 1.0a
11:8 EREG RW 0x0 Extended Register Number. This field selects the extended con-
figuration register number as defined by Section 7.2.2 of the PCI
Express Base Specification, Rev. 1.0a
31:12 Reserved RO 0x0 Reserved field.
Bit
Field
Field
Name
Type Default
Value
Description
31:0 DATA RW 0x0 Configuration Data. A read from this field will return the configura-
tion space register value pointed to by the ECFGADDR register. A
write to this field will update the contents of the configuration space
register pointed to by the ECFGADDR register with the value writ-
ten. For both reads and writes, the byte enables correspond to
those used to access this field.
When the ECFGADDR register points to the ECFGDATA register,
then reads from ECFGDATA return zero and writes are ignored.
When the ECFGADDR register points to itself, writes to the ECFG-
DATA register modify the contents of the ECFGADDR register.
SMBus reads of this field return a value of zero and SMBus writes
have no effect.
Bit
Field
Field
Name
Type Default
Value
Description