XRT4500 Datasheet, PDF (92/99 Pages) Exar Corporation – MULTIPROTOCOL SERIAL NETWORK INTERFACE IC

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SCENARIO 20
HDLC (L)
TXD
SCTE
TXC
RXC
RXD
XRT4500
MULTIPROTOCOL SERIAL NETWORK INTERFACE IC
REV. 1.0.7
DTE (#17)
60
TX1
63 ^{TXD 78}
62
79
64
77
67
TX2
65
76
70
70
73
RX3
71
71
72 ^RXC 64
74
RX2
76
65
78 ^RXD 63
1
RX1
79
62
XRT4500
DCE (#20)
HDLC (R)
MUX 1
1
RX1
RXD
74
RX2
RXC
TX3
TX2
TX1
XRT4500
68
TXC
67
SCTE
60
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 (#20)
PIN
#
NAME
STATE
DESCRIPTION
31 DCE/DTE
1
DCE
34
EC
1
No Echo
50 2CK/3CK
X
Don’t care
18
LP
0
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.
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