XRT4500 Datasheet, PDF (81/99 Pages) Exar Corporation – MULTIPROTOCOL SERIAL NETWORK INTERFACE IC

XRT4500
MULTIPROTOCOL SERIAL NETWORK INTERFACE IC
REV. 1.0.7
SCENARIO 4
áç
HDLC (L)
TXD
SCTE
TXC
RXC
RXD
INPUT PIN SETTINGS
DTE (#1)
60
TX1
63 TXD ⁷⁸
62
79
67
TX2
64 SCTE 77
65
76
DCE (#4)
MUX 1
1
RX1
HDLC (R)
RXD
74
RX2
RXC
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
COMMENTS: DCE LOOP-BACK MODE
68
TXC
67
SCTE
60
TXD
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 (#4)
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
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.
78