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CS61577-IL1Z Datasheet(PDF) 15 Page - Cirrus Logic |
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CS61577-IL1Z Datasheet(HTML) 15 Page - Cirrus Logic |
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15 / 30 page  Simultaneous selection of local and remote loop- back modes is not valid (see Reset). In the Extended Hardware Mode the transmitted data is looped before the AMI/B8ZS/HDB3 en- coder/decoder during remote loopback so that the transmitted signal matches the received signal, even in the presence of received bipolar viola- tions. Data output on RDATA is decoded, however, if RCODE is low. Alarm Indication Signal In the Extended Hardware Mode, the receiver sets the output pin AIS high when less than 3 zeros are detected out of 2048 bit periods. Line Code Encoder/Decoder In the Extended Hardware Mode, three line codes are available: AMI, B8ZS and HDB3. The input to the encoder is TDATA. The outputs from the decoder are RDATA and BPV (Bipolar Violation Strobe). The encoder and decoder are selected using the LEN2, LEN1, LEN0, TCODE a nd RCODE pins as shown in Table 8. Parallel Chip Select In the Extended Hardware Mode, PCS can be used to gate the digital control inputs: TCODE, RCODE, LEN0, LEN1, LEN2, RLOOP, LLOOP and TAOS. Inputs are accepted on these pins only when PCS is low and will immediately change the operating state of the device. Therefore, when cycling PCS to update the operating state, the digital control inputs should be stable for the en- tire PCS low period. The digital control inputs are ignored when PCS is high Driver Performance Monitor To aid in early detection and easy isolation of non-functioning links, the IC is able to monitor transmit drive performance and report when the driver is no longer operational. This feature can be used to monitor either the device’s perform- ance or the performance of a neighboring driver. The driver performance monitor indicator is nor- mally low, and goes high upon detecting a driver failure. The driver performance monitor consists of an ac- tivity detector that monitors the transmitted signal when MTIP is connected to TTIP and MRING is connected to TRING. DPM will go high if the absolute difference between MTIP and MRING does not transition above or below a threshold level within a time-out period. In the Host Mode, DPM is available from the register and pin 11. Whenever more than one line interface IC resides on the same circuit board, the effectiveness of the driver performance monitor can be maximized by having each IC monitor performance of a neigh- boring IC, rather than having it monitor its own performance. Note that a CS61577 can not be used to monitor a CS61574 due to output stage differences. LEN 2/1/0 000 010-111 TCODE (Transmit Encoder Selection) LOW HDB3 Encoder B8ZS Encoder HIGH AMI Encoder RCODE (Receiver Decoder Selection) LOW HDB3 Decoder B8ZS Decoder HIGH AMI Decoder Table 8. Encoder/Decoder Selection CS61577 DS155F 15 |
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