XRT4500 Datasheet, PDF (94/99 Pages) Exar Corporation – MULTIPROTOCOL SERIAL NETWORK INTERFACE IC

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SCENARIO 22
XRT4500
MULTIPROTOCOL SERIAL NETWORK INTERFACE IC
REV. 1.0.7
HDLC (L)
60
TXD
67
SCTE
DTE (#17)
63
TX1
62
64
TX2
65
TXD
78
79
77
76
DCE (#22)
HDLC (R)
RX1
1
RXD
74
RX2
RXC
73
TXC
74
RXC
1
RXD
70
70
RX3
71
71
RXC
72
64
RX2
76
65
RXD
78
63
RX1
79
62
XRT4500
68
TX3
TXC
67
TX2
SCTE
60
TX1
TXD
XRT4500
INPUT PIN SETTINGS (1 CLOCK MODE)
DTE (#17)
PIN
#
NAME
STATE
DESCRIPTION
31 DCE/DTE
0
DTE
34
EC
1
No Echo
50 2CK/3CK
X
Don’t care
18
LP
1
No Loopback
54
CKINV
1
No Invert
55
DTINV
1
No Invert
53
OSCEN
1
No Internal OSC
DCE (#22)
PIN
#
NAME
STATE
DESCRIPTION
31 DCE/DTE
1
DCE
34
EC
1
No Echo
50 2CK/3CK
X
Don’t care
18
LP
1
No Loopback
54
CKINV
0
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.
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