XRT72L54 Datasheet, PDF (44/484 Pages) Exar Corporation – FOUR CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER

XRT72L54
FOUR CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER
REV. P1.1.2
áç
PRELIMINARY
PIN DESCRIPTION
PIN #
V12
V13
V14
V15
V16
V17
V18
V19
V20
PIN NAME
TxNib2[3]/
TxHDLCDat2[3]
TxNib0[3]/
TxHDLCDat0[3]
TxNIBClk[3]/
SndFCS[3]
TxNibFrame[3]/
ValFCS[3]
RxNib3[2]/
RxHDLCDat3[2]
RxNib1[2]/
RxHDLCDat1[2]
RxSer[3]/
RxIdle[3]
RxFrame[3]
RD_DS
W1
W2
W3
W4
W5
W6
W7
W8
W9
W10
LLOOP[2]
TAOS[2]
RxRed[2]
TxLev[2]
Req[2]
TxOHIns[2]/
TxHDLCDat4[2]
RxOH[3]/
RxHDLCDat6[3]
RxOHFrame[2]/
RxHDLCDat4[2]
RxOHClk[2]/
RxHDLCClk[2]
TxOHClk[2]
TYPE
I
I
O
I
O
O
O
O
O
I
O
O
O
O
O
I
O
O
O
O
DESCRIPTION
See Description for Pin C20
See Description for Pin D18
See Description for Pin F18
See Description for Pin G17
See Description for Pin H19
See Description for Pin G20
See Description for Pin F19
See Description for Pin F20
Read Data Strobe (Intel Mode):
If the microprocessor interface is operating in the Intel Mode, then this
input will function as the RD (READ STROBE) input signal from the
local µP. Once this active-low signal is asserted, then the Framer will
place the contents of the addressed registers (within the Framer) on the
Microprocessor Data Bus (D(7:0)). When this signal is negated, the
Data Bus will be tri-stated.
Data Strobe (Motorola Mode):
If the microprocessor interface is operating in the Motorola mode, then
this pin will function as the active-low Data Strobe signal.
See Description for Pin C7
See Description for Pin C6
See Description for Pin B5
See Description for Pin C3
See Description for Pin A5
See Description for Pin C14
See Description for Pin C12
See Description for Pin A13
See Description for Pin D12
See Description for Pin A14
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