UM0434 datasheet(104/390 Pages) STMICROELECTRONICS

104 / 390 page

UM0434

105/391

4.19.2

Parallel signature status register (PSSR)

PSSR, shown in

Table 93, provides status relative to operation of the parallel signature unit.

The PSSR register fields are described in

Table 94.

4.19.3

Parallel signature high register (PSHR)

The PSHR, shown in

Table 4.19.4, provides signature information for the high word (bits 63–

32) of the AHB data read and data write buses. Writing PSHR initializes a seed value before

enabling signature accumulation. PSCR[INIT] may also be used to clear the PSHR. PSHR

is unaffected by system reset, thus should be initialized by software before performing

parallel signature operations.

WREN

Write enable.

0 Processor write cycles are ignored.

1 Processor write cycles are accumulated. For inactive byte lanes, zeros

are used for the data values.

INIT

This bit can be written with a 1 to set the values in the PSHR, PSLR, and PSCTR

registers to all 0s. (0x00000000). This bit always reads as 0.

Table 92.

PSCR field descriptions (continued)

Bits

Name

Description

Table 93.

parallel signature status register (PSSR)

Field

—

TERR

Reset

Unaffected

R/W

—

w1c

DCR

DCR 273

Table 94.

PSSR field descriptions

Bits

Name

Description

32–62

—

Reserved, should be cleared.

TERR

Transfer error status. Indicates whether a transfer error occurs on accumulated read

data and that the read data values returned are ignored and 0s are used instead.

Hardware does not clear TERR; only a software write of 1 to TERR clears it.

0 No transfer error on accumulated read data since software last cleared

this bit.

1 A transfer error occurred on accumulated read data since software last

cleared this bit.

UM0434 Datasheet(PDF) 104 Page - STMicroelectronics

UM0434 Datasheet(HTML) 104 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL