Datasheet

4–2
A bit description table is typically included that indicates bit field names, a detailed field description, and field access
tags. Table 4–2 describes the field access tags.
Table 4–2. Bit Field Access Tag Descriptions
ACCESS
TAG
NAME MEANING
R Read Field may be read by software.
W Write Field may be written by software to any value.
S Set Field may be set by a write of 1. Writes of 0 have no effect.
C Clear Field may be cleared by a write of one. Writes of 0 have no effect.
U Update Field may be autonomously updated by PCI2040.
4.1 Vendor ID Register
This 16-bit value is allocated by the PCI Special Interest Group (SIG) and identifies TI as the manufacturer of this
device. The vendor ID assigned to TI is 104Ch.
Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Name Vendor ID
Type R R R R R R R R R R R R R R R R
Default 0 0 0 1 0 0 0 0 0 1 0 0 1 1 0 0
Register: Vendor ID
Type: Read-only
Offset: 00h
Default: 104Ch
4.2 Device ID Register
This 16-bit value is allocated by the vendor and identifies the PCI device. The device ID for the PCI2250 is AC23h.
Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Name Device ID
Type R R R R R R R R R R R R R R R R
Default 1 0 1 0 1 1 0 0 0 0 1 0 0 0 1 1
Register: Device ID
Type: Read-only
Offset: 02h
Default: AC23h