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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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CDB61535 데이터시트(PDF) 8 Page - Cirrus Logic |
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CDB61535 데이터시트(HTML) 8 Page - Cirrus Logic |
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8 / 44 page  THEORY OF OPERATION CS61577 Enhancements Relative to CS61574 Existing designs using the CS61574 can be con- verted to the higher performance, pin-compatible CS61577 with no changes to the PCB, external component or system software. The CS61577 provides higher performance and more features than the CS61574 including: • Selection of 75 Ω or 120 Ω E1 output op- tions under software or hardware control, • 50 mARMS transmitter short-circuit current limiting for E1 (per OFTEL OTR-001), • internally controlled pulse width for E1 output options, • 35% lower power consumption, • Increased transmitter immunity to signal re- flections for improved signal quality, • Optional AMI, B8ZS, HDB3 encoder/de- coder or external line coding support, • Receiver AIS (unframed all ones) detection, • Improved receiver Loss of Signal handling (LOS set at power-up, reset upon receipt of 3 ones in 32 bit periods with no more than 15 consecutive zeros), • Transmitter TTIP and TRING outputs are forced low when TCLK is static, • The Driver Performance Monitor operates over a wider range of input signal levels. Introduction to Operating Modes The CS61577 supports three operating modes which are selected by the level of the MODE pin as shown in Tables 1 and 2, Figure 7, and Figures A1-A3 of the Applications section. The modes are Hardware Mode, Extended Hard- ware Mode, and Host Mode. In Hardware and Extended Hardware Modes, discrete pins are used to configure and monitor the device. The Ex- tended Hardware Mode provides a parallel chip select input which latches the control inputs al- lowing individual ICs to be configured using a common set of control lines. In the Host Mode, an external processor monitors and configures the device through a serial interface. There are thir- teen multi-function pins whose functionality is determined by the operating mode. (see Table 2). Hardware Mode Extended Hardware Mode Host Mode Control Method Control Pins Control Pins with Parallel Chip Select Serial Interface MODE Pin Level <0.2 V Floating or 2.5 V >(RV+)-0.2 V Line Coding External Internal- AMI, B8ZS, or HDB3 External AIS Detection No Yes No Driver Performance Monitor Yes No Yes Table 1. Differences Between Operating Modes MODE FUNCTION PIN HARDWARE EXTENDED HARDWARE HOST TRANSMITTER 3TPOS TDATA TPOS 4TNEG TCODE TNEG RECEIVER/DPM 6 RNEG BPV RNEG 7RPOS RDATA RPOS 11 DPM AIS DPM 17 MTIP RCODE MTIP 18 MRING - MRING CONTROL 18 - PCS - 23 LEN0 LEN0 INT 24 LEN1 LEN1 SDI 25 LEN2 LEN2 SDO 26 RLOOP RLOOP CS 27 LLOOP LLOOP SCLK 28 TAOS TAOS CLKE Table 2. Pin Definitions CS61577 8 DS155PP2 |
유사한 부품 번호 - CDB61535 |
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유사한 설명 - CDB61535 |
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