XRT4500 Datasheet, PDF (96/99 Pages) Exar Corporation – MULTIPROTOCOL SERIAL NETWORK INTERFACE IC

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SCENARIO 48
HDLC (L)
60
TXD
67
SCTE
XRT4500
MULTIPROTOCOL SERIAL NETWORK INTERFACE IC
REV. 1.0.7
DTE (#17)
TX1
TX2
63 TXD 78
62
79
64
77
65
76
DCE #48)
1
RX1
74
RX2
HDLC (R)
RXD
RXC
73
TXC
74
RXC
RXD
1
70
70
68
RX3
71
61
TX3
72 _RXC 64
RX2
76
65
78 _RXD 63
RX1
79
62
67
TX2
60
TX1
CLK
Q
D
XRT4500
XRT4500
TXC
SCTE
TXD
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 (#48)
PIN
#
NAME
STATE
DESCRIPTION
31 DCE/DTE
1
DCE
34
EC
0
Echo Mode
50 2CK/3CK
X
Don’t care
18
LP
0
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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