XR72L52 Datasheet, PDF (25/480 Pages) Exar Corporation – TWO CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER

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TWO CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER
XRT72L52
REV. 1.0.1
PIN DESCRIPTION
PIN #
74
75
76
77
78
79
80
81
82
83
84
85
86
PIN NAME
TxNibFrame[1]/
ValFCS[1]
TxFrame[1]
TxNIBClk[1]/
SndFCS[1]
TxOHInd[1]/
TxHDLCDat6[1]
GND
TxSer[1]/
SndMsg[1]
TxNib3[1]/
TxHDLCDat3[1]
TxNib2[1]/
TxHDLCDat2[1]
TxNib1[1]/
TxHDLCDat1[1]
TxNib0[1]/
TxHDLCDat0[1]
NC
RD_DS
TestMode
TYPE
O
See Description for Pin 129
DESCRIPTION
O See Description for Pin 128
O See Description for Pin 130
I
O See Description for Pin 131
I
**** Ground
I See Description for Pin 133
I See Description for Pin 134
I See Description for Pin 135
I See Description for Pin 136
I See Description for Pin 137
I Read Data Strobe (Intel Mode):
If the microprocessor interface is operating in the Intel Mode, then this input
functions as the RD (READ STROBE) input signal from the local µP. Once this
active-low signal is asserted, then the Framer places 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 is tri-stated.
Data Strobe (Motorola Mode):
If the microprocessor interface is operating in the Motorola mode, then this pin
functions as the active-low Data Strobe signal.
*** Factory Test Pin:
This pin should be tied to Ground.
9