Host Controller Data Manual

4–14

4.17 Self-ID Buffer Pointer Register

The self-ID buffer pointer register points to the 2-Kbyte aligned base address of the buffer in host memory where the

self-ID packets are stored during bus initialization. Bits 31–11 are read/write accessible. Reserved bits 10–0 are

read-only and return 0s when read.

Bit 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16

Name Self-ID buffer pointer

Type R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W

Default X X X X X X X X X X X X X X X X

Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Name Self-ID buffer pointer

Type R/W R/W R/W R/W R/W R R R R R R R R R R R

Default X X X X X 0 0 0 0 0 0 0 0 0 0 0

Type: Read/Write, Read-only

Offset: 64h

Default: XXXX XX00h

4.18 Self-ID Count Register

The self-ID count register keeps a count of the number of times the bus self-ID process has occurred, flags self-ID

packet errors, and keeps a count of the self-ID data in the self-ID buffer. See Table 4–11 for a complete description

of the register contents.

Bit 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16

Name Self-ID count

Type RU R R R R R R R RU RU RU RU RU RU RU RU

Default X 0 0 0 0 0 0 0 X X X X X X X X

Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Name Self-ID count

Type R R R R R RU RU RU RU RU RU RU RU RU R R

Default 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

Type: Read/Update, Read-only

Offset: 68h

Default: X0XX 0000h

Table 4–11. Self-ID Count Register Description

BIT FIELD NAME TYPE DESCRIPTION

31 selfIDError RU

When this bit is 1, an error was detected during the most recent self-ID packet reception. The con-

tents of the self-ID buffer are undefined. This bit is cleared after a self-ID reception in which no errors

are detected. Note that an error can be a hardware error or a host bus write error.

30–24 RSVD R Reserved. Bits 30–24 return 0s when read.

23–16 selfIDGeneration RU

The value in this field increments each time a bus reset is detected. This field rolls over to 0 after

reaching 255.

15–11 RSVD R Reserved. Bits 15–11 return 0s when read.

10–2 selfIDSize RU

This field indicates the number of quadlets that have been written into the self-ID buffer for the current

bits 23–16 (selfIDGeneration field). This includes the header quadlet and the self-ID data. This field is

cleared to 0 when the self-ID reception begins.

1–0 RSVD R Reserved. Bits 1–0 return 0s when read.