XRT72L56 Datasheet, PDF (31/486 Pages) Exar Corporation – SIX CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER

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PRELIMINARY
XRT72L56
SIX CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER
REV. P1.1.2
PIN DESCRIPTION FOR THE XRT72L56
PIN #
C26
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
D16
D17
D18
PIN NAME
RxOHFrame[2]/
RxHDLCDat4[2]
RxAIS[2]
TRST
NC
NC
NC
TxLev[0]
DMO[5]
DMO[0]
RxAIS[0]
RLOOP[0]
RxNib3[0]/
RxHDLCDat3[0]
RxNib1[0]/
RxHDLCDat1[0]
TxNibClk[0]/
SndFCS[0]
TxNib1[0]/
TxHDLCDat1[0]
TxNib2[0]/
TxHDLCDat2[0]
RxOOF[5]
RxFrame[5]
RxSer[5]/
RxIdle[5]
TYPE
O
See Description for Pin A11
DESCRIPTION
O See Description for Pin A5
I
JTAG Reset Pin: Resets Boundary Scan Logic
O See Description for Pin B5
I
"Drive Monitor Output" Input (from the XR-T7300 DS3/E3 Line Inter-
face Unit IC):
This input pin is intended to be tied to the DMO output pin of the XRT7300
DS3/E3 Line Interface Unit IC. The user can determine the state of this
input pin by reading Bit 2 (DMO) within the Line Interface Scan Register
(Address = 0x81). If this input signal is "high", then it means that the drive
monitor circuitry (within the XRT7300 DS3/E3 Line Interface Unit IC) has
not detected any bipolar signals at the MTIP and MRING inputs within the
last 128 (32 bit-periods. If this input signal is "low", then it means that bipo-
lar signals are being detected at the MTIP and MRING input pins of the
XRT7300 device.
If this customer is not using the XR-T7300 DS3/E3 Line Interface Unit IC,
then he/she can use this input pin for a variety of other purposes.
I
See Description for Pin D7
O See Description for Pin A5
O See Description for Pin C3
O See Description for Pin A19
O See Description for Pin A25
O See Description for Pin B20
I
I
Transmit Nibble-Parallel Payload Data Input -1:
NOTE: See Description for pin A23.
Transmit HDLC Data Input- 1:
This pin accepts bit 1 TxHDLC data when the HDLC controller is turned on.
I
See Description for Pin C22
O See Description for Pin B8
O See Description for Pin A9
O See Description for Pin B25
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