Texas Instruments TSB12LV26 - Manual (Page 52)

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
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
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.