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XRT83VSH316 Datasheet(PDF) 8 Page - Exar Corporation |
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XRT83VSH316 Datasheet(HTML) 8 Page - Exar Corporation |
8 / 96 page XRT83VSH316 PRELIMINARY 6 16-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT REV. P1.0.3 RECEIVER SECTION NAME PIN TYPE DESCRIPTION RxON Y16 I Receive On/Off Input Upon power up, the receivers are powered off. Turning the receivers On or Off can be selected through the microprocessor interface by programming the appropriate channel register if the hardware pin is pulled "High". If the hard- ware pin is pulled "Low", all channels are automatically turned off. NOTE: Internally pulled "Low" with a 50K Ω resistor. RxTSEL A16 I Receive Termination Control Upon power up, the receivers are in "High" impedance. Switching to internal termination can be selected through the microprocessor interface by program- ming the appropriate channel register. However, to switch control to the hard- ware pin, RxTCNTL must be programmed to "1" in the appropriate global register. Once control has been granted to the hardware pin, it must be pulled "High" to switch to internal termination. NOTE: Internally pulled "Low" with a 50k Ω resistor. RLOS T4 O Receive Loss of Signal (Global Pin for All 16-Channels) When a line side receive loss of signal occurs for any one of the 16-channels according to ITU-T G.775, the RLOS pin will go "High" for a minimum of one RCLK cycle. RLOS will remain "High" until the loss of signal condition clears. See the Receive Loss of Signal section of this datasheet for more details. NOTE: This pin is for redundancy applications to initiate an automatic switch to the backup card. For individual channel RLOS, see the register map. SRLOS T5 O System Receive Loss of Signal (Global Pin for All 16-Channels) When a system side receive loss of signal occurs for any one of the 16-chan- nels according to ITU-T G.775, the SRLOS pin will go "High" for a minimum of one TCLK cycle. SRLOS will remain "High" until the loss of signal condition clears. See the Receive Loss of Signal section of this datasheet for more details. RxTSEL (pin) Rx Termination External Internal 0 1 Note: RxTCNTL (bit) must be set to "1" |
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