XRT4500 Datasheet, PDF (82/99 Pages) Exar Corporation – MULTIPROTOCOL SERIAL NETWORK INTERFACE IC

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SCENARIO 5 & 2
HDLC (L)
TXD
SCTE
TXC
RXC
RXD
XRT4500
MULTIPROTOCOL SERIAL NETWORK INTERFACE IC
REV. 1.0.7
DTE (#5)
60
TX1
67
TX2
63
TXD
62
DCE (#2)
78
RX1
1
79
64
SCTE
77
74
RX2
65
76
70
73
RX3
71
72
74
RX2
76
78
1
RX1
79
XRT4500
TXC
RXC
RXD
70
68
71
TX3
64
67
65
TX2
63
60
62
TX1
XRT4500
HDLC (R)
RXD
RXC
TXC
SCTE
TXD
INPUT PIN SETTINGS
COMMENTS: TXC CLOCK INVERSION IN DTE MODE
DTE (#5)
PIN
#
NAME
STATE
DESCRIPTION
31 DCE/DTE
0
DTE
34
EC
1
No Echo
50 2CK/3CK
0
3 clock
18
LP
1
No Loopback
54
CKINV
0
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.
79