
DS3112
86 of 135
AWC
VALUE
00h
01h
02h
06h
07h
FFh
ALTERNATING COUNT ACTION
Send the word in BERTRP0
1
time followed by the word in BERTRP1
1
time…
Send the word in BERTRP0
2
times followed by the word in BERTRP1
2
times…
Send the word in BERTRP0
3
times followed by the word in BERTRP1
3
times…
Send the word in BERTRP0
7
times followed by the word in BERTRP1
7
times…
Send the word in BERTRP0
8
times followed by the word in BERTRP1
8
times…
Send the word in BERTRP0
256
times followed by the word in BERTRP1
256
times…
Register Name:
Register Description:
Register Address:
Bit #
Name
Default
Bit #
Name
Default
Register Name:
Register Description:
Register Address:
Bit #
Name
Default
Bit #
Name
Default
Note:
Bits that are underlined are read-only; all other bits are read-write.
Bits 0 to 31/BERT Repetitive Pattern Set (RP0 to RP31).
RP0 is the LSB and RP31 is the MSB. These
registers must be properly loaded for the BERT to properly generate and synchronize to either a repetitive
pattern, a pseudorandom pattern, or a alternating word pattern. For a repetitive pattern that is less than 17
bits, then 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 right most bit is one sent first and received
first) then BERTRP0 should be loaded with xB5AD and BERTRP1 should be loaded with x5AD6. For a
pseudorandom pattern, both registers should be loaded with all ones (i.e., xFFFF) For an alternating
word pattern, one word should be placed into BERTRP0 and the other word should be placed into
BERTRP1. For example, if the DDS stress pattern “7E” is to be described, the user would place x0000 in
BERTRP0 and x7E7E in BERTRP1 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.
BERTRP0
BERT Repetitive Pattern 0 (lower word)
74h
7
6
5
4
3
2
1
0
RP7
0
RP6
0
RP5
0
RP4
0
RP3
0
RP2
0
RP1
0
RP0
0
15
14
13
12
11
10
9
8
RP15
0
RP14
0
RP13
0
RP12
0
RP11
0
RP10
0
RP9
0
RP8
0
BERTRP1
BERT Repetitive Pattern 1 (upper word)
76h
7
6
5
4
3
2
1
0
RP23
0
RP22
0
RP21
0
RP20
0
RP19
0
RP18
0
RP17
0
RP16
0
15
14
13
12
11
10
9
8
RP31
0
RP30
0
RP29
0
RP28
0
RP27
0
RP26
0
RP25
0
RP24
0