Global Address Space Access Registers - IDT 89HPES64H16G2 User Manual

IDT PCI to PCI Bridge and Proprietary Port Specific Registers

Global Address Space Access Registers

GASAADDR - Global Address Space Access Address (0xFF8)
Bit
Field
1:0
18:2
31:19
GASADATA - Global Address Space Access Data (0xFFC)
Bit
Field
31:0
PES64H16G2 User Manual
Field Default
Type
Name Value
Reserved RO 0x0
GADDR RW 0x0
Reserved RO 0x0
Field Default
Type
Name Value
DATA RW 0x0
Description
Reserved field.
Global Address. This field selects the system address of the reg-
ister to be accessed via the GASADATA register.
The value of this register must not be programmed to point to the
address of the GASAADDR or GASADATA register in this or any
other port.
Similarly, the value of this register must not be programmed to
point to the address of the Extended Configuration Address (ECF-
GADDR) or Extended Configuration Data registers (ECFGDATA)
in this or any other function.
Violations of these rules produce undefined results.
Reserved field.
Description
Data. A read from this field will return the global space register
value pointed to by the GASAADDR register. A write to this field
will update the contents of the global space register pointed to by
the GASAADDR register with the value written. For both reads and
writes, the byte enables correspond to those used to access this
field.
SMBus reads of this field return a value of zero and SMBus writes
have no effect.
16 - 72 April 5, 2013