Datasheet

4−2

A bit description table, typically included when a register contains bits of more than one type or purpose, indicates

bit field names, which appear in the signal column; a detailed field description, which appears in the function column;

and field access tags, which appear in the type column of the bit description table. 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 1. Writes of 0 have no effect.

U Update Field may be autonomously updated by the PCI1520.

4.2 Vendor ID Register

This 16-bit register contains a value allocated by the PCI Special Interest Group (SIG) and identifies the manufacturer

of the PCI 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

Offset: 00h (functions 0, 1)

Type: Read-only

Default: 104Ch

4.3 Device ID Register

This 16-bit register contains a value assigned to the PCI1520 by TI. The device identification for the PCI1520 is

AC55h.

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 1 0 1 0 1 0 1

Offset: 02h (functions 0, 1)

Type: Read-only

Default: AC55h