DS2155 datasheet(206/262 Pages) DALLAS

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DS2156

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26.4 BERT Repetitive Pattern Set

These registers must be properly loaded for the BERT to generate and synchronize to a repetitive pattern,

a pseudorandom pattern, alternating word pattern, or a Daly pattern. For a repetitive pattern that is fewer

than 32 bits, the pattern should be repeated so that all 32 bits are used to describe the pattern. For

example, if the pattern was the repeating 5-bit pattern …01101… (where the rightmost bit is the one sent

first and received first), then BRP1 should be loaded with ADh, BRP2 with B5h, BRP3 with D6h, and

BRP4 with 5Ah. For a pseudorandom pattern, all four registers should be loaded with all 1s (i.e., FFh).

For an alternating word pattern, one word should be placed into BRP1 and BRP2 and the other word

should be placed into BRP3 and BRP4. For example, if the DDS stress pattern “7E” is to be described,

the user would place 00h in BRP1, 00h in BRP2, 7Eh in BRP3, and 7Eh in BRP4 and the alternating

word counter would be set to 50 (decimal) to allow 100 bytes of 00h followed by 100 bytes of 7Eh to be

sent and received.

BRP1

BERT Repetitive Pattern Set Register 1

DCh

Bit #

Name

RPAT7

RPAT6

RPAT5

RPAT4

RPAT3

RPAT2

RPAT1

RPAT0

Default

Bits 0 to 7/BERT Repetitive Pattern Set Bits 0 to 7 (RPAT0 to RPAT7). RPAT0 is the LSB of the 32-bit

repetitive pattern set.

BRP2

BERT Repetitive Pattern Set Register 2

DDh

Bit #

Name

RPAT15

RPAT14

RPAT13

RPAT12

RPAT11

RPAT10

RPAT9

RPAT8

Default

Bits 0 to 7/BERT Repetitive Pattern Set Bits 8 to 15 (RPAT8 to RPAT15)

BRP3

BERT Repetitive Pattern Set Register 3

DEh

Bit #

Name

RPAT23

RPAT22

RPAT21

RPAT20

RPAT19

RPAT18

RPAT17

RPAT16

Default

Bits 0 to 7/BERT Repetitive Pattern Set Bits 16 to 23 (RPAT16 to RPAT23)

BRP4

BERT Repetitive Pattern Set Register 4

DFh

Bit #

Name

RPAT31

RPAT30

RPAT29

RPAT28

RPAT27

RPAT26

RPAT25

RPAT24

Default

Bits 0 to 7/BERT Repetitive Pattern Set Bits 24 to 31 (RPAT24 to RPAT31). RPAT31 is the LSB of the 32-bit

repetitive pattern set.

DS2155 Datasheet(PDF) 206 Page - Dallas Semiconductor

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