XRT4500 Datasheet, PDF (93/99 Pages) Exar Corporation – MULTIPROTOCOL SERIAL NETWORK INTERFACE IC

XRT4500
MULTIPROTOCOL SERIAL NETWORK INTERFACE IC
REV. 1.0.7
SCENARIO 21
HDLC (L)
60
TXD
67
SCTE
DTE (#21)
TX1
TX2
63 TXD 78
62
79
64
77
65
76
DCE (#18)
1
RX1
74
RX2
73
TXC
74
RXC
RXD
1
70
70
68
RX3
71
61
TX3
72 _RXC 64
67
RX2
76
65
TX2
78 _RXD 63
60
RX1
79
62
TX1
XRT4500
XRT4500
INPUT PIN SETTINGS (1 CLOCK MODE)
áç
HDLC (R)
RXD
RXC
TXC
SCTE
TXD
DTE (#21)
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
0
Invert
55
DTINV
1
No Invert
53
OSCEN
1
No Internal OSC
DCE (#18)
PIN
#
NAME
STATE
DESCRIPTION
31 DCE/DTE
1
DCE
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
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.
90