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XRT72L53 Datasheet(PDF) 11 Page - Exar Corporation |
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XRT72L53 Datasheet(HTML) 11 Page - Exar Corporation |
11 / 467 page XRT72L53 áç áç áç áç THREE CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER REV. P1.1.7 PRELIMINARY 11 C6 TAOS[0] O Transmit All Ones Signal (TAOS) Command Input - Channel 0 (for the DS3/E3 LIU IC): This output pin is intended to be connected to the TAOS input pin of the DS3/E3 Line Interface Unit IC. The user can control the state of this out- put pin by writing a '0' or '1' to Bit 4 (TAOS) of the Line Interface Drive Register (Address = 0x80). If the user commands this signal to toggle "High" then it will force the Line Interface Unit IC to transmit an "All Ones" pattern onto the line. Conversely, if the user commands this out- put signal to toggle "Low" then the DS3/E3 Line Interface Unit IC will proceed to transmit data based upon the pattern that it receives via the TxPOS[0] and TxNEG[0] output pins. Writing a "1" to Bit 4 of the Line Interface Drive Register (Address = 0x80) will cause this output pin to toggle "High". Writing a "0" to this bit- field will cause this output pin to toggle "Low". If the customer is not using an Exar “XRT73L0X Family of DS3/E3 LIU ICs then this output pin can be used for a variety of other purposes. C7 LLOOP[0] O Local Loopback Output Pin - Channel 0 (to be connected to the DS3/E3 Line Interface Unit IC): This output pin is intended to be connected to the LLOOP input pin of the DS3/E3 LIU IC. The user can command this signal to toggle "High" and, in turn, force the LIU into the Local Loopback mode. Writing a "1" to bit 1 of the Line Interface Drive Register (Address = 0x80) will cause this output pin to toggle "High". Writing a "0" to this bit- field will cause the RLOOP output to toggle "Low". NOTE: This output pin can be used as a General Purpose Output. C8 RLOL[1] I Receive Loss of Lock Indicator input - Channel 1 (from the DS3/E3 LIU IC): See Description for Pin B8 C9 DMO[0] I Drive Monitor Output Input pin - Channel 0 (from the DS3/E3 Line Interface Unit IC): This input pin is intended to be tied to the DMO output pin of the DS3/ E3 Line Interface Unit IC. The user can determine the state of this input pin by reading Bit 2 (DMO) within the Line Interface Scan Register (Address = 0x81). If this input signal is "High", then it means that the drive monitor circuitry (within the DS3/E3 Line Interface Unit IC) has not detected any bipolar signals at the MTIP and MRING inputs within the last 128 (32 bit-periods. If this input signal is "Low", then it means that bipolar signals are being detected at the MTIP and MRING input pins of the DS3/E3 LIU device. NOTE: This input pin can be used as a General Purpose Input pin. C10 RxOHFrame[1]/ RxHDLCDat4[1] O Receive Overhead Frame Boundary Indicator/Receive HDLC Con- troller Data Output - Bit 4; Channel 1: See Description for Pin A13 C11 TxOHEnable[1]/ TxHDLCDat7[1] O I Transmit Overhead Data Input Enable/Transmit HDLC Controller Data Output - Bit 7; Channel 1: See Description for Pin B14 PIN DESCRIPTION CONNECTED PINS PIN #PIN NAME TYPE DESCRIPTION |
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