XRT4500 Datasheet, PDF (86/99 Pages) Exar Corporation – MULTIPROTOCOL SERIAL NETWORK INTERFACE IC

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SCENARIO 9 & 10
XRT4500
MULTIPROTOCOL SERIAL NETWORK INTERFACE IC
REV. 1.0.7
HDLC (L)
TXD
SCTE
DTE (#9)
63
60
TX1
62
64
67
TX2
65
TXD
78
79
77
76
DCE (#10)
RX1
1
74
RX2
HDLC (R)
RXD
RXC
TXC
RXC
RXD
70
73
RX3
71
72
74
RX2
76
78
1
RX1
79
XRT4500
TXC
RXC
RXD
70
71
TX3
64
65
TX2
63
62
TX1
XRT4500
68
TXC
67
SCTE
60
TXD
COMMENTS: 2 CLOCK MODE OPERATION WITHIN THE ‘DCE MODE’. THIS FEATURE IS USEFUL FOR APPLICATIONS
THAT INTERFACE TO A DEVICE WHICH DOES NOT SUPPLY ‘SCTE’ CLOCK SIGNAL
INPUT PIN SETTINGS
DTE (#9)
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 (#10)
PIN
#
NAME
STATE
DESCRIPTION
31 DCE/DTE
1
DCE
34
EC
1
No Echo
50 2CK/3CK
1
2 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.
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