UM0434 datasheet(105/390 Pages) STMICROELECTRONICS

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4.19.4

Parallel signature low register (PSLR)

PSLR, shown in

Table 4.19.5, provides signature information for the low word (bits 31-0) of

the AHB data read and data write buses. Writing PSLR initializes a seed value prior to

enabling signature accumulation. PSCR[INIT] can also be used to clear the PSLR. PSLR is

unaffected by system reset, thus should be initialized by software prior to performing parallel

signature operations.

4.19.5

Parallel signature counter register (PSCTR)

PSCTR, shown in

Table 4.19.6, provides count information for signature accumulation. It is

incremented on every accumulated transfer or on an mtdcr psulr,rS. Writing to PSCTR

initializes a value before enabling signature accumulation. PSCR[INIT] can also be used to

clear PSCTR. PSCTR is unaffected by system reset, thus should be initialized by software

before performing parallel signature operations.

4.19.6

Parallel signature update high register (PSUHR)

PSUHR, shown in

Table 98, updates the high signature value via software. It can be written

via an mtdcr psuhr, rS instruction to cause signature accumulation to occur in the PSHR

using the data value written. Writing to this register does not cause the PSCTR to

increment.

Table 95.

Parallel signature high register (PSHR)

Field

High signature

Reset

Unaffected

R/W

DCR

DCR 274

Table 96.

Parallel signature low register (PSLR)

Field

Low signature

Reset

Unaffected

R/W

DCR

DCR 275

Table 97.

Parallel signature counter register (PSCTR)

Field

Counter

Reset

Unaffected

R/W

DCR

DCR 276

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