UM0434 datasheet(102/390 Pages) STMICROELECTRONICS

102 / 390 page

UM0434

103/391

4.19

Parallel signature unit registers

To support applications requiring system integrity checking during operation, the e200z3

provides a Parallel Signature unit to monitor the CPU data read and data write AHB buses

and to accumulate a pair of 32-bit MISR signatures of the data values transferred over these

buses.

The primitive polynomial used is P(X)=1+X10+X30+X31+X32. Values are accumulated based

on an initially programmed seed value and are qualified based on active byte lanes of the

data read and data write buses (

p_d_hrdata[63:0], p_d_hwdata[63:0]) as indicated via the

p_d_hbstrb[7:0] signals. Inactive byte lanes use a value of all zeros as input data to the

MISRs. Refer to

Table 170 for active byte lane information. If a transfer error occurs on any

accumulated read data, the returned read data is ignored, a value of all zeros is used

instead, and the error is logged. Errors occurring on data writes are not logged, since the

data driven by the CPU is valid.

The unit can be independently enabled for read cycles and write cycles, allowing for flexible

usage. Software can also control accumulation of software-provided values via a pair of

update registers. In addition, there is a counter for software to monitor the number of beats

of data compressed.

Updates are performed when the parallel signature registers are initialized, when a qualified

bus cycle is terminated, when a software update is performed via a high or low update

instruction.

Note:

Updates due to qualified bus transfers are suppressed for the duration of a debug session.

SRR0

Unaffected 1

SRR1

Unaffected 1

SVR 3

—

TBL

Unaffected 1

TBU

Unaffected 1

TCR

0x0000_0000

TLB0CFG– TLB1CFG

—

TSR

Undefined on power-on reset; otherwise, 0x(0b00||WRS)000_0000

USPRG0

Unaffected 1

XER

0x0000_0000

Undefined on

m_por assertion, unchanged on p_reset_b assertion.

For CTXCR 0 only, others unaffected.

Read-only register.

Table 90.

Reset settings for e200z3 resources (continued)

Resource

System reset setting

UM0434 Datasheet(PDF) 102 Page - STMicroelectronics

UM0434 Datasheet(HTML) 102 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