Texas Instruments TSB12LV26 manual Self-ID Buffer Pointer Register, Self-ID Count Register

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

Register:

Self ID-buffer pointer

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
	Register:		Self-ID count
	Type:		Read/Update, Read-only
	Offset:		68h
	Default:		X0XX 0000h

Table 4±11. Self-ID Count Register Description

BIT	FIELD NAME	TYPE	DESCRIPTION
			When this bit is 1, an error was detected during the most recent self-ID packet reception. The con-
31	selfIDError	RU	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.
			This field indicates the number of quadlets that have been written into the self-ID buffer for the current
10±2	selfIDSize	RU	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.

4±14