XRT4500 Datasheet, PDF (80/99 Pages) Exar Corporation – MULTIPROTOCOL SERIAL NETWORK INTERFACE IC

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SCENARIO 3 &2 DTE LOOP-BACK MODE
HDLC (L)
TXD
DTE (#3)
MUX 1
60
TX1
67
SCTE
TX2
XRT4500
MULTIPROTOCOL SERIAL NETWORK INTERFACE IC
REV. 1.0.7
DCE (#2)
63
TXD
78
RX1
1
62
79
64
SCTE
77
74
RX2
65
76
HDLC (R)
RXD
RXC
73
TXC
74
RXC
RXD
1
70
RX3
71
77
RX2
76
78
RX1
79
XRT4500
TXC
RXC
RXD
70
68
71
TX3
64
67
TX2
65
63
60
62
TX1
XRT4500
TXC
SCTE
TXD
INPUT PIN SETTINGS
DTE (#3)
PIN
#
NAME
STATE
DESCRIPTION
31 DCE/DTE
0
DTE
34
EC
1
No Echo
50 2CK/3CK
0
3 clock
18
LP
0
Loopback
54
CKINV
1
No Invert
55
DTINV
1
No Invert
53
OSCEN
1
No Internal OSC
DCE (#2)
PIN
#
NAME
STATE
DESCRIPTION
31 DCE/DTE
1
DCE
34
EC
1
No Echo
50 2CK/3CK
0
3 clock
18
LP
1
No Loopback
54
CKINV
1
No Invert
55
DTINV
1
No Invert
53
OSCEN
1
No Internal OSC
NOTE: When M0=1, M2=1, M2=0 the XRT4500 is in the 1 clock (X.21) mode and the 2CK/3CK input pin is ignored.
77