cx20493-35/app Conexant Systems, Inc., cx20493-35/app Datasheet - Page 51

• Manufacturer Part Number: cx20493-35/app
• Description: With Cx20493 Smartdaa?
• Manufacturer: Conexant Systems, Inc.

Table 3-4. CX81801 Modem Pin Signal Definitions for Serial Interface (PARIF = Low) (Continued)
102247B
RXCLK# (P_PB01)
TXCLK# (P_PA04)
XTCLK# (GP00)
AAIND# (PC4)
TMIND# (PB7)
DTRIND# (PD0)
OHIND# (PE0)
CX81801-7x/8x SmartV.XX Modem in 128-Pin LQFP with CX20493 in 32-Pin LQFP Data Sheet
Label
51
54
52
127
109
6
14
Pin
V.24 (EIA/TIA-232-E) DTE Serial Interface (Continued)
O
O
I
O
O
O
O
I/O
Itpu/Ot2
Itpu/Ot2
It/Ot2
Ith/Ot8
It/Ot8
Ithpd/Ot2
It/Ot8
I/O Type
LED Indicator Interface
Conexant
Receive Data Clock. A synchronous Receive Data Clock
(RXCLK) is output in synchronous modes. The RXCLK frequency
is the data rate (±0.01%) with a duty cycle of 50±1%. Leave open
if not used.
Transmit Data Clock. A synchronous Transmit Data Clock
(TXCLK) is output in synchronous modes. The TXCLK frequency
is the data rate (±0.01%) with a duty cycle of 50±1%. Leave open
if not used.
External Data Clock. A synchronous External Transmit Data
Clock (XTCLK) is input in synchronous modes.
Auto Answer Indicator. AAIND# output ON (low) corresponds to
the indicator on. AAIND# output is active when the modem is
configured to answer the ring automatically (ATS0 command ≠ 0).
Test Mode Indicator. TMIND# output ON (low) corresponds to the
indicator on. TMIND# output pulses (indicator flashes) when the
modem is in test mode and if an error is detected.
DTR Indicator. DTRIND# output ON (low) corresponds to the
indicator on. The DTRIND# state reflects the DTR# output state
except when the &D0 command is active, in which case DTRIND#
is low.
Off-Hook Indicator. OHIND# (PE0) indicates the status of the off-
hook relay.
Signal Name/Description
3-19