DS21458LDK Maxim Integrated, DS21458LDK Datasheet - Page 192

• Manufacturer Part Number: DS21458LDK
• Description: Network Controller & Processor ICs
• Manufacturer: Maxim Integrated

27.2 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 less
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 right-most bit is the one sent
first and received first) then BRP1 should be loaded with ADh, BRP2 with B5h, BRP3 with D6h, and
BRP4 should be loaded with 5Ah. For a pseudorandom pattern, all four registers should be loaded with
all ones (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.
Register Name:
Register Description:
Register Address:
Bit #
Name
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.
Register Name:
Register Description:
Register Address:
Bit #
Name
Default
Bits 0 to 7/BERT Repetitive Pattern Set Bits 8 to 15 (RPAT8 to RPAT15).
Register Name:
Register Description:
Register Address:
Bit #
Name
Default
Bits 0 to 7/BERT Repetitive Pattern Set Bits 16 to 23 (RPAT16 to RPAT23).
Register Name:
Register Description:
Register Address:
Bit #
Name
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.
RPAT15
RPAT23
RPAT31
RPAT7
7
0
7
0
7
0
7
0
RPAT14
RPAT22
RPAT30
RPAT6
BRP1
BERT Repetitive Pattern Set Register 1
DCh
BRP2
BERT Repetitive Pattern Set Register 2
DDh
BRP3
BERT Repetitive Pattern Set Register 3
DEh
BRP4
BERT Repetitive Pattern Set Register 4
DFh
6
0
6
0
6
0
6
0
RPAT13
RPAT21
RPAT29
RPAT5
5
0
5
0
5
0
5
0
RPAT12
RPAT20
RPAT28
RPAT4
4
0
4
0
4
0
4
0
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RPAT11
RPAT19
RPAT27
RPAT3
3
0
3
0
3
0
3
0
DS21455/DS21458 Quad T1/E1/J1 Transceivers
RPAT10
RPAT18
RPAT26
RPAT2
2
0
2
0
2
0
2
0
RPAT17
RPAT25
RPAT1
RPAT9
1
0
1
0
1
0
1
0
RPAT16
RPAT24
RPAT8
RPAT0
0
0
0
0
0
0
0
0