XRT4500 Datasheet, PDF (85/99 Pages) Exar Corporation – MULTIPROTOCOL SERIAL NETWORK INTERFACE IC

XRT4500
MULTIPROTOCOL SERIAL NETWORK INTERFACE IC
REV. 1.0.7
SCENARIO 8
áç
HDLC (L)
TXD
SCTE
DCE (#1)
60
TX1
63 TXD ⁷⁸
62
79
76
TX2
64 SCTE 77
65
76
DCE (#8)
MUX 1
RX1
HDLC (R)
1
RXD
74
RX2
RXC
TXC
RXC
RXD
73
RX3
74
RX2
1
RX1
XRT4500
70 TXC 70
71
71
72 RXC 64
76
65
78 RXD 63
79
62
TX3
TX2
TX1
XRT4500
68
TXC
67
SCTE
60
TXD
INPUT PIN SETTINGS
DTE (#1)
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
1
No Invert
55
DTINV
1
No Invert
53
OSCEN
1
No Internal OSC
DCE (#8)
PIN
#
NAME
STATE
DESCRIPTION
31 DCE/DTE
1
DCE
34
EC
1
No Echo
50 2CK/3CK
0
3 clock
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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