DS33R41 Maxim Integrated Products, DS33R41 Datasheet - Page 109
DS33R41
Manufacturer Part Number
DS33R41
Description
Network Controller & Processor ICs Inverse-Multiplexing Ethernet Mapper wit
Manufacturer
Maxim Integrated Products
Datasheet
1.DS33R41.pdf
(335 pages)
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DS33R41 Inverse-Multiplexing Ethernet Mapper with Quad Integrated T1/E1/J1 Transceivers
10.25.3 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
TR.BRP1 should be loaded with ADh, TR.BRP2 with B5h, TR.BRP3 with D6h, and TR.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 TR.BRP1 and TR.BRP2 and the other word should be placed into TR.BRP3 and
TR.BRP4. For example, if the DDS stress pattern “7E” is to be described, the user would place 00h in TR.BRP1,
00h in TR.BRP2, 7Eh in TR.BRP3, and 7Eh in TR.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.
10.25.4 BERT Bit Counter
The BERT Bit Counter is comprised of TR.BBC1, TR.BBC2, TR.BBC3, and TR.BBC4. Once BERT has achieved
synchronization, this 32-bit counter increments for each data bit (i.e., clock) received. Toggling the LC control bit in
TR.BC1 can clear this counter. This counter saturates when full and sets the BBCO status bit.
10.25.5 BERT Error Counter
The BERT Error Counter is comprised of TR.BEC1, TR.BEC2, and TR.BEC3. Once BERT has achieved
synchronization, this 24-bit counter increments for each data bit received in error. Toggling the LC control bit in
TR.BC1 can clear this counter. This counter saturates when full and sets the BECO status bit.
10.25.6 BERT Alternating Word-Count Rate
When the BERT is programmed in the alternating word mode, each word repeats for the count loaded into
TR.BAWC. One word should be placed into TR.BRP1 and TR.BRP2 and the other word should be placed into
TR.BRP3 and TR.BRP4.
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