DSCX-V34LF-066 View Datasheet(PDF) - Conexant Systems
Part Name
Description
MFG CO.
DSCX-V34LF-066
Conexant Systems
'DSCX-V34LF-066' PDF : 82 Pages View PDF
CX86500 SCXV.xx Modem Data Sheet
Table 3-4. CX86500 Modem 38-Pin TSSOP with Serial Interface Hardware Signal Definitions (Continued)
Label
TXD#
RXD#
Pin
7
6
CTS#
16
RLSD#
22
RI#
23
DTR#
17
RTS#
15
DSR#
27
RXCLK#
8
TXCLK#
12
RESERVED
RESERVED
24
11, 18, 19,
21, 28
NC
2, 37
Note:
I/O Types: See Table 3-7.
I/O I/O Type
Signal Name/Description
V.24 (EIA/TIA-232-E) DTE Serial Interface
I
Ipu/O2
Transmitted Data (EIA BA/ITU-T CT103). The DTE uses the TXD# line
to send data to the modem for transmission over the telephone line or to
transmit commands to the modem.
O
Ipu/O2
Received Data (EIA BB/ITU-T CT104). The modem uses the RXD# line
to send data received from the telephone line to the DTE and to send
modem responses to the DTE. During command mode, RXD# data
represents the modem responses to the DTE.
O
Ipu/O2
Clear To Send (EIA CB/ITU-T CT106). CTS# output ON (low) indicates
that the modem is ready to accept data from the DTE. In error correction
or normal mode, CTS# is always ON (low) unless RTS/CTS flow control
is selected by the &Kn command.
O
Ipu/O2
Received Line Signal Detector (EIA CF/ITU-T CT109). During normal
operation, when AT&C0 command is not in effect, RLSD#/CLKSEL#
output is ON when a carrier is detected on the telephone line or OFF
when carrier is not detected.
Clock Frequency Select. During reset processing: 28.224 MHz
operation is selected by RLSD#/CLKSEL# high (by internal pullup when
no external pullup is connected to the pin); 27.000 MHz operation is
selected by RLSD#/CLKSEL# low (pin connected to GND through a
10 KΩ pulldown resistor).
O
Ipu/O2
Ring Indicator (EIA CE/ITU-T CT125). RI# output ON (low) indicates the
presence of an ON segment of a ring signal on the telephone line.
I
Ipu/O2
Data Terminal Ready (EIA CD/ITU-T CT108). The DTR# input is turned
ON (low) by the DTE when the DTE is ready to transmit or receive data.
DTR# ON prepares the modem to be connected to the telephone line,
and maintains the connection established by the DTE (manual
answering) or internally (automatic answering). DTR# OFF places the
modem in the disconnect state under control of the &Dn and &Qn
commands.
I
Ipu/O2
Request To Send (EIA CA/ITU-T CT105). RTS# input ON (low)
indicates that the DTE is ready to send data to the modem. In the
command state, the modem ignores RTS#.
The modem ignores RTS# unless RTS/CTS flow control is selected by
the &Kn command.
O
Ipu/O2
Data Set Ready (EIA CC/ITU-T CT107). DSR# indicates modem status
to the DTE. DSR# OFF (high) indicates that the DTE is to disregard all
signals appearing on the interchange circuits except Ring Indicator (RI#).
DSR# output is controlled by the AT&Sn command.
O
Ipu/O2
Receive Data Clock. RXCLK# is output in synchronous mode. The
RXCLK# frequency is the data rate (±0.01%) with a duty cycle of 50±1%.
Leave open if not used.
O
Ipu/O2
Transmit Data Clock. TXCLK# is output in synchronous mode. The
TXCLK frequency is the data rate (±0.01%) with a duty cycle of 50±1%.
Leave open if not used.
Reserved
Reserved. Connect to digital ground (GND).
Reserved. Leave open or connect to digital ground (GND).
No Connect
No Internal Connection. Leave open.
3-10
Conexant
102287F
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