CX06833-4X View Datasheet(PDF) - Conexant Systems

Part Name

Description

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CX06833-4X

SMXXD Modem

Conexant Systems 

CX06833-3x/4x SMXXD Modem Data Sheet

Table 3-3. CX06833 Pin Signal Definitions (Continued)

Label

XTCLK#

(P_GP01)

RDCLK#

(P_PA07)

TDCLK#

(P_PA03)

TXD# (PA2)

RXD# (PA6)

CTS# (PC1)

DSR# (PC0)

RLSD# (PC2)

RI# (PC5)

DTR# (PD4)

RTS# (PD6)

Pin

58

57

60

35

39

124

123

126

130

21

23

I/O I/O Type

Signal Name/Description

SERIAL DTE INTERFACE CONFIGURATION ONLY (PARIF = LOW)

V.24 (EIA/TIA-232-E) DTE Serial Interface

I It/Ot2

External Data Clock. Synchronous External Transmit Data Clock input in

synchronous modes. Leave open if not used.

O Itpu/Ot2 Receive Data Clock. Synchronous Receive Data Clock output in

synchronous modes. The RDCLK frequency is the data rate (±0.01%) with a

duty cycle of 50±1%. Leave open if not used.

O Itpu/Ot2 Transmit Data Clock. Synchronous Transmit Data Clock output in

synchronous modes. The TDCLK# frequency is the data rate (±0.01%) with a

duty cycle of 50±1%. Leave open if not used.

I It/Ot2

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 It/Ot2

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 Ith/Ot8

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 asynchronous

operation, in error correction or normal mode, CTS# is always ON (low)

unless RTS/CTS flow control is selected by the &Kn command.

In synchronous operation, the modem also holds CTS# ON during

asynchronous command state. The modem turns CTS# OFF immediately

upon going off-hook and holds CTS# OFF until both DSR# and RLSD# are

ON and the modem is ready to transmit and receive synchronous data. The

modem can also be commanded by the &Rn command to turn CTS# ON in

response to an RTS# OFF-to-ON transition.

O Ith/Ot8

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 Ith/Ot8

Received Line Signal Detector (EIA CF/ITU-T CT109). When AT&C0

command is not in effect, RLSD# output is ON when a carrier is detected on

the telephone line or OFF when carrier is not detected.

O Ith/Ot8

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 It

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 Ithpu

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#.

In asynchronous operation, the modem ignores RTS# unless RTS/CTS flow

control is selected by the &Kn command. In synchronous on-line operation,

the modem can be commanded by the &Rn command to ignore RTS# or to

respond to RTS# by turning on CTS# after the delay specified by Register

S26.

3-14

Conexant

102228A

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