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XRT81L27 Datasheet(PDF) 7 Page - Exar Corporation |
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XRT81L27 Datasheet(HTML) 7 Page - Exar Corporation |
7 / 30 page áç áç áç áç XRT81L27 SEVEN CHANNEL E1 LINE INTERFACE UNIT WITH CLOCK RECOVERY REV. 1.1.0 5 43 TClk_6 I Transmitter 6 Clock Input: E1 rate at 2.048MHz ± 50ppm. 44 TPOS_6/ TDATA_6 I Transmitter 6 Positive Data/ NRZ Input: (see pin 38) 45 TNEG_6/ CODE_6 I-L Transmitter 6 Negative Data Input: (see pin 39) 46 TAOS_6 I-L Transmit All Ones Channel_6: (see pin 40) 47 SDO LBM O I Serial Data Output: (Host Mode) This pin is the Serial Data Output port for the Microprocessor Serial Interface access. Loop-back Mode: (Hardware Mode) When this pin is tied "High", Analog Local loop-back is selected. Connect this pin "Low" to select remote loop-back. Digital Local loop- back is not supported in Hardware Mode. 48 SDI B1 I Serial Data Input Port: Host Mode, this pin is the serial data input port (see Figure 5). Hardware Mode, B1, together with B2 (pin 49) and B3 (pin 50) are con- trol bits used to select which one of the seven channels to be placed in Loop-back mode. Analog or Remote Loop-back is determined by LBM (pin 47). 49 SClk B2 I Microprocessor Serial Interface Clock: Host Mode, this clock signal is used to clock SDI/SDO for the Serial Interface. Hardware Mode, B2, together with B1 and B3 are control bits to select which of the seven channels to be placed in Loop-back mode.(see pin 48 description) 50 CS B3 I Chip Select Input: Host Mode, this pin must be asserted "Low" in order to enable commu- nication with the device via the Serial Interface. Hardware Mode, B3, together with B1 and B2 are control bits to select which of the seven channels to be placed in Loop-back mode. (see pin 48 description) 51 TAOS_5 I-L Transmit All Ones Channel_5: (see pin 40) PIN DESCRIPTIONS NOTE: I -H indicates an input pin with a 50k Ω pull-up Resistor, I-L indicates an input pin with a 50kΩ pull-down resistor. PIN #NAME TYPE DESCRIPTION Loop-back Channel Control B1 B2 B3 Chan. # 000 0 001 1 010 2 011 3 100 4 101 5 110 6 111 All |
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