參數(shù)資料
型號: XRT4500
廠商: Exar Corporation
英文描述: MULTIPROTOCOL SERIAL NETWORK INTERFACE IC
中文描述: 多協(xié)議串行網(wǎng)絡(luò)接口芯片
文件頁數(shù): 47/99頁
文件大小: 1384K
代理商: XRT4500
XRT4500
MULTIPROTOCOL SERIAL NETWORK INTERFACE IC
REV. 1.0.7
á
44
1.3.1
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
M[2:0] - The (Communication Interface)
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.
N
OTE
:
The M[2:0] input pins are internally pulled “high”. As
a consequence, the XRT4500 will automatically be config-
ured into the “POWER-DOWN” Mode, if the M[2:0] input
pins are left “floating”.
T
ABLE
5: T
HE
R
ELATIONSHIP
BETWEEN
THE
SETTINGS
FOR
THE
M[2:0]
BIT
-
FIELDS
AND
THE
C
ORRESPONDING
C
OMMUNICATION
I
NTERFACE
THAT
IS
SUPPORTED
C
OMMUNICATION
I
NTERFACE
M2
M1
M0
C
OMMENTS
RS423 (V.10)
0
0
0
All Transmitters and Receivers are functioning in the V.10 Mode.
N
OTE
:
This is not a standard Communication Interface.
EIA-530A (V.11)
0
0
1
EIA-530 (V.36)
0
1
0
RS449
0
1
0
X.21
0
1
1
V.35
1
0
0
Reserved
1
0
1
RS232 (V.28)
1
1
0
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.
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