IDT 89HPES12T3G2, Preliminary User'S Manual

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IDT Configuration Registers
PES12T3G2 User Manual 8 - 10 January 28, 2013
Notes
Register Definitions
Type 1 Configuration Header Registers
VID - Vendor Identification Register (0x000)
DID - Device Identification Register (0x002)
PCICMD - PCI Command Register (0x004)
Bit
Field
Field
Name
Type Default
Value
Description
15:0 VID RO 0x111D Vendor Identification. This field contains the 16-bit vendor ID
value assigned to IDT.
See section Vendor ID on page 1-4.
Bit
Field
Field
Name
Type Default
Value
Description
15:0 DID RO - Device Identification. This field contains the 16-bit device ID
assigned by IDT to this bridge.
See section Device ID on page 1-4.
Bit
Field
Field
Name
Type Default
Value
Description
0 IOAE RW 0x0 I/O Access Enable. When this bit is cleared, the bridge does not
respond to I/O accesses from the primary bus specified by
IOBASE and IOLIMIT.
0x0 -(disable) Disable I/O space.
0x1 - (enable) Enable I/O space.
1 MAE RW 0x0 Memory Access Enable. When this bit is cleared, the bridge does
not respond to memory and prefetchable memory space access
from the primary bus specified by MBASE, MLIMIT, PMBASE and
PMLIMIT.
0x0 - (disable) Disable memory space.
0x1 - (enable) Enable memory space.
2 BME RW 0x0 Bus Master Enable. When this bit is cleared, the bridge does not
issue requests (e.g., memory, I/O and MSIs since they are in-band
writes) on behalf of subordinate devices and handles these as
Unsupported Requests (UR). Additionally, the bridge handles non-
posted transactions in the upstream direction with a Unsupported
Request (UR) completion. This bit does not affect completions in
either direction or the forwarding of non memory or I/O requests.
0x0 - (disable) Disable request forwarding.
0x1 - (enable) Enable request forwarding.
3 SSE RO 0x0 Special Cycle Enable. Not applicable.
4 MWI RO 0x0 Memory Write Invalidate. Not applicable.
5 VGAS RO 0x0 VGA Palette Snoop. Not applicable.
6 PERRE RW 0x0 Parity Error Enable. Not applicable.
7 ADSTEP RO 0x0 Address Data Stepping. Not applicable.