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DS3142 Datasheet(PDF) 45 Page - Dallas Semiconductor |
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DS3142 Datasheet(HTML) 45 Page - Dallas Semiconductor |
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45 / 88 page  DS3141/DS3142/DS3143/DS3144 Single/Dual/Triple/Quad DS3/E3 Framers 45 of 88 7.9 BERT The BERT block can generate and detect the following patterns: § Maximal-length pseudorandom patterns up to 231 - 1 § A repetitive pattern from 1 to 32 bits in length § Alternating (16-bit) words that alternate every 1 to 256 words The BERT receiver has a 24-bit error counter and 32-bit bit counter to allow testing to proceed for long periods without host processor intervention. It can generate interrupts on detecting a bit error, a change in synchronization, or a counter overflow. The BERT can be selected to transmit and receive on the line side or the equipment side. The synchronization algorithm works on a 32-bit block of data, not in a sliding window fashion. The DS3/E3 formatter can be configured to transmit AIS when the BERT is not being used to test the far end, such as when DLB is active or when BM[1:0] = 1X. When DLB is active, the BERT is used to test the inner workings of the chip, and when BM[1:0] = 1X, the BERT is used to test devices connected on the equipment side (TDAT and RDAT). In either case, BERT patterns are transmitted to the far end on TPOS and TNEG unless the DS3/E3 formatter is configured to transmit AIS by setting T3E3CR1:TAIS = 1. 7.9.1 BERT Register Description Table 7-G. BERT Register Map ADDR REGISTER BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 30h BCR1 BM1 BM0 BENA TINV RINV RESYNC TC LC 31h BCR2 N/A PS2 PS1 PS0 RPL3 RPL2 RPL1 RPL0 32h BCR3 N/A N/A N/A N/A EIB2 EIB1 EIB0 SBE 33h BCR4 AWC7 AWC6 AWC5 AWC4 AWC3 AWC2 AWC1 AWC0 38h BSR N/A N/A RA1 RA0 N/A BBCO BECO SYNC 39h BSRL N/A N/A RA1L RA0L BEDL BBCOL BECOL SYNCL 3Ah BSRIE N/A N/A N/A N/A BEDIE BBCOIE BECOIE SYNCIE 3Ch BRPR1 RP7 RP6 RP5 RP4 RP3 RP2 RP1 RP0 3Dh BRPR2 RP15 RP14 RP13 RP12 RP11 RP10 RP9 RP8 3Eh BRPR3 RP23 RP22 RP21 RP20 RP19 RP18 RP17 RP16 3Fh BRPR4 RP31 RP30 RP29 RP28 RP27 RP26 RP25 RP24 40h BBCR1 BBC7 BBC6 BBC5 BBC4 BBC3 BBC2 BBC1 BBC0 41h BBCR2 BBC15 BBC14 BBC13 BBC12 BBC11 BBC10 BBC9 BBC8 42h BBCR3 BBC23 BBC22 BBC21 BBC20 BBC19 BBC18 BBC17 BBC16 43h BBCR4 BBC31 BBC30 BBC29 BBC28 BBC27 BBC26 BBC25 BBC24 44h BBECR1 BEC7 BEC6 BEC5 BEC4 BEC3 BEC2 BEC1 BEC0 45h BBECR2 BEC15 BEC14 BEC13 BEC12 BEC11 BEC10 BEC9 BEC8 46h BBECR3 BEC23 BEC22 BEC21 BEC20 BEC19 BEC18 BEC17 BEC16 |
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