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XRT83SH38IB Datasheet(PDF) 11 Page - Exar Corporation |
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XRT83SH38IB Datasheet(HTML) 11 Page - Exar Corporation |
11 / 78 page XRT83SH38 8 REV. 1.0.7 8-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT TRANSMIT SECTION SIGNAL NAME BGA LEAD # TYPE DESCRIPTION TCLKE/µPTS2 L15 I Transmit Clock Edge Hardware Mode This pin is used to select which edge of the transmit clock is used to sample data on the transmitter on the TPOS/TNEG inputs. By default, data is sampled on the falling edge. To sample data on the rising edge, this pin must be pulled "High". Host Mode µPTS[2:1] pins are used to select the type of microprocessor to be used for Host communication. "00" = 8051 Intel Asynchronous "01" = 68K Motorola Asynchronous "10" = x86 Intel Synchronous "11" = 860 Motorola Synchronous NOTE: This pin is internally pulled “Low” with a 50k Ω resistor. TTIP0 TTIP1 TTIP2 TTIP3 TTIP4 TTIP5 TTIP6 TTIP7 E3 G4 F17 C16 R2 N2 N16 P16 O Transmit Differential Tip Output TTIP is the positive differential output to the line interface. Along with the TRING signal, these pins should be coupled to a 1:2 step up transformer for proper opera- tion. TRING0 TRING1 TRING2 TRING3 TRING4 TRING5 TRING6 TRING7 E2 F3 F15 E16 P2 N4 R15 P17 O Transmit Differential Ring Output TRING is the negative differential output to the line interface. Along with the TTIP signal, these pins should be coupled to a 1:2 step up transformer for proper opera- tion. TPOS0 TPOS1 TPOS2 TPOS3 TPOS4 TPOS5 TPOS6 TPOS7 C5 A4 B14 D14 V4 U5 V15 T14 I TPOS/TDATA Input Transmit digital input pin. In dual rail mode, this pin is the transmit positive data input. In single rail mode, this pin is the transmit non-return to zero (NRZ) data input. NOTE: Internally pulled "Low" with a 50K Ω resistor. TNEG0 TNEG1 TNEG2 TNEG3 TNEG4 TNEG5 TNEG6 TNEG7 C4 B5 D13 B15 U4 V5 U14 R14 I Transmitter Negative NRZ Data Input In dual rail mode, this signal is the negative-rail input data for the transmitter. In single rail mode, this pin can be left unconnected while in Host mode. However, in Hardware mode, this pin is used to select the type of encoding/decoding for the E1/ T1 data format. Connecting this pin “Low” enables HDB3 in E1 or B8ZS in T1. Connecting this pin “High” selects AMI data format. NOTE: Internally pulled “Low” with a 50k Ω resistor. |
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