XRT72L56 Datasheet, PDF (30/486 Pages) Exar Corporation – SIX CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER

XRT72L56
SIX CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER
REV. P1.1.2
áç
PRELIMINARY
PIN DESCRIPTION FOR THE XRT72L56
PIN #
C11
C12
C13
C14
C15
C16
C17
C18
C19
C20
C21
C22
C23
C24
C25
PIN NAME
RxOHInd[0]
RxOHEnable[0]/
RxHDLCDat5[0]
TxOHInd[0]/
TxHDLCDat6[0]
TxNib0[0]/
TxHDLCDat0[0]
TxSer[0]/
SndMsg[0]
RxOHFrame[5]/
RxHDLCDat4[5]
RxOH[5]/
RxHDLCDat6[5]
RxNib2[5]/
RxHDLCDat2[5]
RxOHInd[5]
TxOHEnable[5]/
TxHDLCDat7[5]
TxOH[5]/
TxHDLCDat3[5]
TxNib2[5]/
TxHDLCDat2[5]
RxOOF[2]
RxNib3[2]/
RxHDLCDat3[2]
RxOHInd[2]
TYPE
O
O
DESCRIPTION
Receive Overhead Bit Indicator:
The function of this pin depends on whether the Framer IC is operating in
either the “Serial” or “Nibble-Parallel” Mode.
Serial Mode Operation:
This output pin pulses "high" (for one bit-period) whenever an "overhead" bit
is being output via the "RxSer" output pin, by the "Receive Payload Data
Output Interface" block.
Nibble-Parallel Mode Operation:
This output pin pulses “high” (for one nibble-period) whenever an “over-
head” nibble is being output via the “RxNib[3:0] output pins, by the “Receive
Payload Data Output Interface” block.
NOTE: The purpose of this output pin is to alert the "Receive Terminal
Equipment" that an overhead bit is being output via the "RxSer" output pin,
and that this data should be ignored.
See Description for Pin A17
O See Description for Pin A21
I
I
See Description for Pin A23
I
See Description for Pin A24
O See Description for Pin A11
O See Description for Pin B11
O See Description for Pin A10
O See Description for Pin C11
O See Description for Pin A14
I
I
See Description for Pin A15
I
Transmit Nibble-Parallel Payload Data Input -2:
See Description for pin A23.
Transmit HDLC Data Input - 2:
This pin accepts bit 2 TxHDLC data when the HDLC controller is turned on.
O See Description for Pin B8
O See Description for Pin A19
O See Description for Pin C11
11