XRT75R03D Datasheet, PDF (58/134 Pages) Exar Corporation – THREE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCRONIZER

XRT75R03D
REV. 1.0.2 THREE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCRONIZER
When the XRT75R03D is configured in Host mode, the following input pins,TxLEV_n, TAOS_n, RLB_n,
LLB_n, E3_n, STS-1/DS3_n, REQEN_n, JATx/Rx, JA0 and JA1 are disabled and must be connected to
ground.
The Table 14 below illustrates the functions of the shared pins in either Host mode or in Hardware mode.
TABLE 14: FUNCTIONS OF SHARED PINS
PIN NUMBER
66
67
68
69
71
IN HOST MODE
CS
SClk
SDI
SDO
INT
IN HARDWARE MODE
RxClkINV
TxClkINV
RxON
RxMON
LOSMUT
NOTE: While configured in Host mode, the TxON_n input pins will be active if the TxON_n bits in the control register are set
to “1”, and can be used to turn on and off the transmit output drivers. This permits a system designed for
redundancy to quickly switch out a defective line card and switch-in the backup line card.
53