XRT4500 Datasheet, PDF (47/99 Pages) Exar Corporation – MULTIPROTOCOL SERIAL NETWORK INTERFACE IC

XRT4500
MULTIPROTOCOL SERIAL NETWORK INTERFACE IC
REV. 1.0.7
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1.3.1 M[2:0] - The (Communication Interface)
Mode Control Select Pins.
As mentioned earlier, the XRT4500 is capable of sup-
porting each of the following “Communication Inter-
face” standards.
• ITU-T V.35
• ITU-T V.28 (EIA-232)
• EIA-449
• ITU-T V.36
• ITU-T X.21
• EIA-530
• EIA-530(A)
The XRT4500 can be configured to operate in either
one of these “Communication Interface” standards, by
setting the “M[2:0]” bit-fields to the appropriate val-
ues, as listed in Table 5.
TABLE 5: THE RELATIONSHIP BETWEEN THE SETTINGS FOR THE M[2:0] BIT-FIELDS AND THE CORRESPONDING
COMMUNICATION INTERFACE THAT IS SUPPORTED
COMMUNICATION INTERFACE M2 M1 M0
COMMENTS
RS423 (V.10)
0 0 0 All Transmitters and Receivers are functioning in the V.10 Mode.
NOTE: This is not a standard Communication Interface.
EIA-530A (V.11)
001
EIA-530 (V.36)
010
RS449
010
X.21
011
V.35
100
Reserved
101
RS232 (V.28)
110
Power Down Mode
1 1 1 All Transmitters and Receivers are shut-off. Transmitter outputs are tri-stated
and all internal loads are disconnected. The charge pump and DC-DC con-
nect continues to operate.
NOTE: The M[2:0] input pins are internally pulled “high”. As ured into the “POWER-DOWN” Mode, if the M[2:0] input
a consequence, the XRT4500 will automatically be config- pins are left “floating”.
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