Bert Function | Maxim DS21Q55 specification

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DS21Q55

25. BERT FUNCTION

The BERT (Bit Error Rate Tester) block can generate and detect both pseudorandom and repeating-bit patterns. It is used to test and stress data-communication links.

The BERT block is capable of generating and detecting the following patterns:

§The pseudorandom patterns 2E7, 2E11, 2E15, and QRSS

§A repetitive pattern from 1 to 32 bits in length

§Alternating (16-bit) words that flip every 1 to 256 words

§Daly pattern

The BERT function is assigned on a per-channel basis for both the transmitter and receiver. This is accomplished by using the special per-channel function. Using this function, the BERT pattern can be transmitted and/or received in single or across multiple DS0s, contiguous or broken. Transmit and receive bandwidth assignments are independent of each other.

The BERT receiver has a 32-bit bit counter and a 24-bit error counter. The BERT receiver will report three events: a change in receive-synchronizer status, a bit error detection, and if either the bit counter or the error counter overflows. Each of these events can be masked within the BERT function via the BERT control register 1 (BC1). If the software detects that the BERT has reported an event, then the software must read the BERT information register (BIR) to determine which event(s) has occurred. To activate the BERT block, the host must configure the BERT multiplexer via the BIC register.

SR9 contains the status information on the BERT function. The host can be alerted when there is a change of state of the BERT via this register. A major change of state is defined as either a change in the receive synchronization (i.e., the BERT has gone into or out of receive synchronization), a bit error has been detected, or an overflow has occurred in either the bit counter or the error counter. The host must read SR9 to determine the change of state.

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Maxim DS21Q55 specifications Bert Function

Contents

Applications FeaturesOrdering Information Description Product Preview DS21Q55 Ansi General Feature HighlightsLine Interface Clock Synthesizer System Interface Framer/Formatter Hdlc Controllers Test and DiagnosticsExtended System Information Bus Control Port Product Preview DS21Q55 012103 Table of Contents Signaling Operation Error Count RegistersPER-CHANNEL Idle Code Generation Channel Blocking Registers 170 149177 186 AC Timing Parameters and Diagrams Operating ParametersMechanical Descriptions Document Revision History Block Diagram Figure Block Diagram PIN Function Description Transmit Side Pins TSYNCx Transmit Signaling InputTransmit Sync Input/Output Receive Side Pins Receive Signaling Freeze Receive Signaling OutputRSYNCx Receive Sync Parallel Control Port Pins INTTstrst BTS MUX A7/ALEAS Jtag Test Access Port PinsJtrst Jtms Line Interface Pins Supply Pins Pinout DS21Q55 PIN Description Table PIN Symbol Type Description DVSS4 DVSS3ESIBRD1 ESIBRD2 RFSYNC3 RFSYNC2RFSYNC4 RLCLK1 RSIGF4 RSIGF3RSYNC1 RSYNC2 TLINK4 TLINK3TNEGI1 TNEGI2 TVSS2 TVSS3TVSS4 AD1 Package DS21Q55 Pin DIAGRAM, 27mm BGA Parallel Port Register MapAddress Register Name Abbreviation IMR9 SR9Pcpr PCDR1 RS2 RS1RS3 RS4 TCBR4 TCBR3H1TC H1FC RFDLM2 RFDLM1Iboc RAF Information Register Name Special PER-CHANNEL Register OperationPcpr Rsaoics Rsrcs Rfcs Brcs Thscs Peics Tfcs Btcs PCDR2 PCDR1PCDR3 PCDR4 Programming Sequence Figure Programming Model Master Mode Register Power-Up SequenceTEST1 TEST0 Effect on Output Pins Mstrreg Status Registers Interrupt Handling Interrupt Information Registers Information RegistersIIR1 IIR2 Clock MAP Clock MAP FigureTransmit Clock Source T1 Control Registers T1 FRAMER/FORMATTER Control RegistersT1RCR1 OOF2 OOF1 OUT of Frame Criteria Bit 5/Receive B8ZS Enable RB8ZS = B8ZS disabled Bit 1/Receive Japanese CRC6 Enable RJCBit 6/Receive Frame Mode Select RFM = D4 framing mode T1RCR2 T1TCR1 T1TCR2 Bit 7/Transmit B8ZS Enable TB8ZS = B8ZS disabled06h TB8ZS TSLC96 Tzse FBCT2 FBCT1 TD4YM Tzbtsi TB7ZS T1CCR1 Bit 2/Transmit Frame Mode Select TFM = D4 framing modeT1 Common Control Register 07h T1 Receive-Side Digital-Milliwatt Code Generation T1 Transmit Transparency T1RDMR1 T1RDMR2T1RDMR3 INFO1 T1 Information RegisterInformation Register 10h T1 Alarm Criteria Table Alarm SET Criteria Clear CriteriaYellow Alarm RAI E1 FRAMER/FORMATTER Control Registers E1 Control RegistersE1RCR1 E1RCR2 E1 SYNC/RESYNC Criteria Table34h Rcla E1TCR1 Bit 1/Automatic AIS Generation Aais = disabled Bit 0/Automatic Remote Alarm Generation ARA = disabledBit 2/Automatic E-Bit Enable Aebe E1TCR2 Automatic Alarm Generation E1 Information Registers INFO3INFO7 E1 Alarm Criteria Table Common Control and Status Registers CCR1TCSS1 TCSS0 Transmit Clock Source SR2 IDR IMR2 Bit 2/Receive Unframed All Ones Blue Alarm Condition RUA1Interrupt Mask Register 19h SR3 1AhLspare LDN LUP Lotc Lorc V52LNK Rdma RRA IMR3 Bit 0/Receive Remote Alarm Condition RRA = interrupt masked1Bh Bit 2/V5.2 Link Detected Condition V52LNK 1Ch SR4RSA1 RSA0 TMF TAF RMF Rcmf RAF Bit 2/Receive Multiframe Event RMF IMR4 IOCR1 11. I/O PIN Configuration Options IOCR2 Lbcr Loopback ConfigurationLoopback Control Register 4Ah Information Per-Channel Loopback PCLR1PCLR2 4Dh PCLR3PCLR4 4Eh Ercnt Error Count Registers T1 Line Code Violation Counting Options Table Line Code Violation Count Register LcvcrE1 Line Code Violation Counting Options Table T1 Operation Line Code Violation Count Register LCVCR142h LCVCR2 Framing Mode Path Code Violation Count Register PcvcrT1 Path Code Violation Counting Arrangements Table Frames Out Of Sync Count Register Foscr Framing Mode Count MOS or F-BIT Errors What is CountedT1 Frames OUT of Sync Counting Arrangements Table ERCNT.1 Information FOSCR1 Bit Counter Register EbcrFOSCR2 EBCR1 Transmit DS0 Monitor Registers 14. DS0 Monitoring FunctionTDS0SEL TDS0M Receive DS0 Monitor Registers RDS0SELRDS0M Signaling Operation Hardware-Based Receive Signaling Processor-Based Receive SignalingReceive-Signaling Reinsertion at Rser Change Of State Receive-Signaling Freeze Force Receive Signaling All OnesSignaling Control Register Sigcr MSB LSB CH2-A CH2-B MSB LSBCH1-A CH1-B CH4-A CH4-B RS1 to RS16 Receive Signaling Registers E1 Mode, CAS Format60h to 6Fh CH9-A CH9-B CH9-C CH9-D RS6 RSCSE1 RSCSE1 , RSCSE2 , RSCSE3 , RSCSE4RSCSE2 RSCSE3 Processor-Based Transmit Signaling 15.2.1.2 E1 Mode 15.2.1.1 T1 ModeTime Slot Numbering Schemes Table Channel Phone TS1 to TS16 Transmit Signaling Registers E1 Mode, CAS Format50h to 5Fh TS1 TS2 TS3 TS4 TS5 TS6 TS7 TS8 TS9 Transmit Signaling Registers E1 Mode, CCS Format 50h to 5Bh Transmit Signaling Registers T1 Mode, ESF Format TS2 CH6-A CH6-B TS1 CH4-A CH4-BTS3 CH8-A CH8-B TS4 Software Signaling Insertion Enable Registers, E1 CAS Mode SSIE1SSIE2 0Ah SSIE3Lcaw SSIE4 Software Signaling Insertion Enable Registers, T1 Mode Hardware-Based Transmit Signaling PER-CHANNEL Idle Code Generation Idle Code Array Address Mapping TableBits 0-5 of Iaar Register Maps to Channel Write Iaar = 40h Write Pcicr = 7Eh Idle Code Programming Examples Pcicr IaarTCICE1 TCICE2 Information TCICE4 TCICE3RCICE1 RCICE2 86h RCICE3RCICE4 87h Channel Blocking Registers RCBR1RCBR2 RCBR4 RCBR3TCBR1 TCBR2 8Eh TCBR3TCBR4 8Fh Elastic Stores Operation Escr Bit 0/Receive Elastic Store Enable ReseElastic Store Control Register 4Fh 1Eh SR5Tesf Tesem Tslip Resf Resem Rslip IMR5 Product Preview DS21Q55 109 012103 18.1.1 T1 Mode 18.1.2 E1 ModeReceive Side Minimum-Delay Mode Elastic Store Delay After Initialization TableTransmit Side Elastic Stores Initialization 112 012103 CRC-4 Recalculate Method Figure 19. G.706 INT Ermediate CRC-4 Updating E1 Mode only 20. T1 BIT Oriented Code BOC Controller Transmit BOCReceive BOC BOC Control Register Bocc37h Rboce RBR RBF1 RBF0 Sboc C0h Receive FDL RegisterSR8 24h IMR8 Additional Sa and International Si BIT Operation E1 only Hardware Scheme MethodInternal Register Scheme Based On Double-Frame Method Rnaf RAF Tnaf TAF RSiAF Internal Register Scheme Based On CRC4 Multiframe MethodReceive Si Bits of the Align Frame C8h RRA Receive Sa4 Bits RSa4CBh RSa5 Receive Sa6 Bits RSa6CDh RSa7 RSa8 Receive Sa8 BitsCFh TSiAF Transmit Si Bits of the Align FrameD2h TRA Transmit Sa4 Bits TSa4D5h TSa5 Transmit Sa6 Bits TSa6D7h TSa7 TSa8 Transmit Sa8 BitsD9h Tsacr Basic Operation Details Hdlc Controllers Hdlc Controller Registers Table H1TC, H2TC Hdlc ConfigurationHdlc #1 Transmit Control, Hdlc #2 Transmit Control 90h, A0h H1RC, H2RC Bit 0/Receive SS7 Fill In Signal Unit Delete RsfdHdlc #1 Receive Control, Hdlc #2 Receive Control 31h, 32h H1FC, H2FC Fifo ControlRFHWM2 RFHWM1 RFHWM0 Receive Fifo Watermark Bytes TFLWM2 TFLWM1 TFLWM0 Transmit Fifo Watermark Bytes Receive Hdlc MappingRegister Channels H2RCS1, H2RCS2, H2RCS3, H2RCS4 H1RTSBS, H2RTSBS 96h, A6hRCB8SE RCB7SE RCB6SE RCB5SE RCB4SE RCB3SE RCB2SE RCB1SE Transmit 97h, 98h, 99h, 9Ah A7h, A8h, A9h, AAhTHCS7 THCS6 THCS5 THCS4 THCS3 THCS2 THCS1 THCS0 H1TTSBS, H2TTSBS 9Bh, AbhTCB8SE TCB7SE TCB6SE TCB5SE TCB4SE TCB3SE TCB2SE TCB1SE Hdlc #1 Status Register Hdlc #2 Status Register SR6, SR720h, 22h Tmend RPE RPS Rhwm RNE Tlwm TNF IMR6, IMR7 INFO5, INFO6 PS2 PS1 PS0 Packet StatusINFO4 Receive Packet Bytes Available Fifo InformationH1TFBA, H2TFBA H1RPBA, H2RPBA 22.3.5 H1TF, H2TFH1RF, H2RF Legacy FDL Support T1 Mode Receive Hdlc Code ExampleReceive Section Rfdl RFDL7 RFDL6 RFDL5 RFDL4 RFDL3 RFDL2 RFDL1 RFDL0RFDLM1, RFDLM2 Transmit Section 22.6 D4/SLC-96 OperationTfdl Transmit FDL Register Basic Network Connections Figure Line Interface Unit LIU LIU Receiver LIU Operation Receive G.703 Synchronization Signal E1 Mode Monitor ModeTypical Monitor Application Figure Transmit G.703 Synchronization Signal E1 Mode Transmit BPV Error InsertionLIU Transmitter Transmit Short-Circuit Detector/Limiter Mclk Prescaler CMI Code Mark Inversion OptionCMI Coding Figure LIC1 23.7 LIU Control Registers Application Return Loss E1 Mode Tlbc Network Mode GC5 GC4 GC3 GC2 GC1 GC0Transmit Line Build-Out Control 7Dh 79h LIC2ETS Lirst Ibpv TUA1 Jamux Scld Clds Bit 7/E1/T1 Select ETS MM1 MM0 LIC3 TT1 TT0 Internal Transmit Termination Configuration RT1 RT0 Internal Receive Termination ConfigurationLIC4 MPS1 MPS0 Jamux LIC2.3 RL3 RL2 RL1 RL0 INFO2 CCR4 SR1 Ilut Timer Rscos16h Lrcl Tcle Tocd Lolitc Timer Rscos IMR117h 1µF Recommended Circuits Basic Interface Figure Protected Interface Using Internal Receive Termination Specification Recommended Value Component Specifications Transformer Specifications Table T1 Transmit Pulse Template Figure E1 Transmit Pulse Template Figure Jitter Tolerance E1 Mode Figure Jitter Tolerance T1 Mode Figure Jitter Attenuation E1 Mode Figure Jitter Attenuation T1 Mode Figure Programmable IN-BAND Loop Code Generation and Detection RDN2 RDN1 RDN0 IbccRUP2 RUP1 RUP0 TC1 TC0 Transmit Code Definition Register TCD1B7h TCD2 RUPCD2 RUPCD1 RDNCD1 RDNCD2 RsccRSC2 RSC1 RSC0 Receive -Spare Code Definition Register RSCD1BEh RSCD2 Bert Function Bert Register Description BC1PS2 PS1 PS0 Pattern Definition BC2 EIB2 EIB1 EIB0 Error Rate InsertedE1h Length Bits BIC Bit 0/BERT Enable Berten = Bert disabledBER T Interface Control Register EAh SR9 26hBbed Bbco BEC0 BRA1 BRA0 Brlos Bsync Bawc IMR9 BRP1 Bert Repetitive Pattern SetBRP2 BRP3 BBC1 Bert Bit CounterBBC2 BBC3 BEC1 Bert Error CounterBEC2 BEC3 Payload Error Insertion Function Transmit Error Insertion Setup Sequence TableStep Action Bits 0 to 3/Error Insertion Rate Select Bits ER0 to ER3 Error Rate Control RegisterER3 ER2 ER1 ER0 Error Rate ERC Error Insertion Examples Table Number Of Error RegistersValue Write Read NOE1 Number Of Errors Left Register NOEL1NOEL2 Channel Interleave Mode Frame Interleave ModeInterleaved PCM BUS Operation Iboc DA0 Device PositionIBS1 IBS0 BUS Size DS21Q55 #1 Rser DS21Q55 #3 Rser IBO Example Figure Esib Group of Four DS21Q55s Figure Extended System Information BUS Esib Extended System Information Bus Control Register ESIBCR1B0h ESIBSEL2 ESIBSEL1 ESIBSEL0 BUS BIT Driven ESI4SEL2 ESI4SEL1 ESI4SEL0 Status Output T1 Mode E1 Mode ESI3SEL2 ESI3SEL1 ESI3SEL0 Status Output T1 Mode E1 ModeESIBCR2 B1h ESIB2 ESIB1ESIB3 ESIB4 Programmable Backplane Clock Synthesizer CCR2BPCS1 BPCS0 CCR3 Fractional T1/E1 Support72h Tdatfmt Tgpcken Rdatfmt Rgpcken Jtag Functional Block Diagram Figure JTAG-BOUNDARY-SCAN Architecture and TEST-ACCESS Port Update-DR Test-Logic-ResetTAP Controller State Machine Run-Test-Idle Select-IR-Scan Update-IRCapture-IR Shift-IR TAP Controller State Diagram Figure Instruction Register Instruction Codes for Ieee 1149.1 Architecture TableInstruction Selected Register Instruction Codes Device ID Codes Table ID Code Structure TableMSB LSB Device BIT ID Boundary Scan Register Test RegistersBypass Register Identification Register Boundary Scan Control Bits Table BIT PIN Symbol Type Control BIT DescriptionRchblk Jtms Bpclk Jtclk Jtrst ESIBS0 ESIBS1 MUX Tsig Teso NXA Tdata NXA Tsysclk Tssync TchclkDvss Dvdd Esibrd Rsysclk Rsync RLOS/LOTC Receive Side ESF Timing Figure Rclk Rsysclk Rsysclk Rser Transmit Side D4 Timing Figure Transmit Side ESF Timing Figure Transmit Side Boundary Timing With Elastic Store Disabled Tsysclk TSER1 32.2 E1 Mode Receive Side Timing Figure Receive Side Boundary Timing With Elastic Store Disabled RSYNC2 Rmsync RSYNC3 Rchclk Rchblk 221 012103 Receive IBO Channel Interleave Mode Timing Figure Receive IBO Frame Interleave Mode Timing Figure TIMING, E1 Mode only Figure Transmit Side Timing Figure Tser LSB Si Tssync Tchclk Tchblk 228 012103 Transmit IBO Channel Interleave Mode Timing Figure Transmit IBO Frame Interleave Mode Timing Figure Thermal Characteristics Operating Parameters Absolute Maximum RatingsTHETA-JA θJA vs Airflow Parameter Symbol MIN TYP MAX DC CharacteristicsRecommended DC Operating Conditions Capacitance Parameter Symbol MIN TYP MAX Units AC Timing Parameters and Diagrams Intel BUS Write Timing BTS = 0 / MUX = 1 Figure Intel BUS Read Timing BTS = 0 / MUX = 1 Figure Motorola BUS Timing BTS = 1 / MUX = 1 Figure 236 012103 Intel BUS Read Timing BTS = 0 / MUX = 0 Figure Motorola BUS Read Timing BTS = 1 / MUX = 0 Figure Receive Side AC Characteristics AC CHARACTERISTICS-RECEIVE SideParameter Symbol MIN TYP MAX Units Receive Side Timing T1 Mode Figure Receive Side TIMING, Elastic Store Enabled T1 Mode Figure Receive Line Interface Timing Figure Parameter Symbol MIN Transmit AC CharacteristicsTYP E1 MAX Units Tsysclk = 8.192MHz Tsysclk = 16.384MHz Transmit Side TIMING, Elastic Store Enabled Figure Transmit Line Interface Timing Figure Mechanical Descriptions Product Preview DS21Q55 248 012103