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參數(shù)資料
| 型號： | RH56D-PCI |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | MODEM DEVICE FAMILY FOR DESKTOP APPLICATIONS |
| 中文描述： | 調(diào)制解調(diào)器設(shè)備家庭桌面應(yīng)用程序 |
| 文件頁數(shù)： | 29/60頁 |
| 文件大?。?/td> | 357K |
| 代理商： | RH56D-PCI |
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RH56D-PCI Modem Designer’s Guide
1213
Conexant
3-9
Conexant Proprietary Information
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Label
Pin
I/O Type
Signal Name/Description
TELEPHONE LINE (DAA)/AUDIO INTERFACE
OH#
(GPIO0)
104
Ot12
Off-Hook Relay Control.
Output (typically active low) used to control the normally
open off-hook relay. The polarity of this output is configurable.
CID#
(GPIO1)
103
Ot12
Caller ID Relay Control.
Output (typically active low) used to control the normally open
Caller ID relay. The polarity of this output is configurable.
VOICE#
(GPIO2)
102
Ot12
Voice Relay Control.
Output (typically active low) used to control the normally open
voice relay. The polarity of this output is configurable.
Ring Wakeup.
Not used. Connect to +3.3V through 10K
.
RINGWAKE#
(INPUT 0)
106
It
IRING#
(INPUT3)
110
Itpu
Ring Indicate.
A low-going edge used to indicate presence of a ring frequency.
Typically connected to the output of an optoisolator or equivalent. The idle state (no
ringing) output of the ring detect circuit should be high.
LCS#
(INPUT2)
108
Itpu
Line Current Sense Handset.
Active low input used to indicate local modem handset
off-hook status.
LCS_L#/RH_L#
(INPUT 5)
112
Itpu
Remote Hang-up.
Active low input used to indicate hang-up of the remote modem or
telephone, i.e., the remote modem/telephone has released the line (gone on-hook).
EXT_L#
(INPUT4)
111
Itpu
Extension Offhook.
Active low input used to indicate the telephone line is in use by
the local handset or an extension phone.
SPKMUTE
(GPIO8)
100
It/Ot12
Speaker Mute/Vaux Mode Power Select.
Output (typically active low) used to turn off
(mute) the speaker during normal operation.
Upon device reset, this pin is temporarily an input and is sampled. If sampled high and
VauxDET is high, VpciEN# will be asserted when the device is in D0. If sampled low
(e.g., SPKMUTE signal is pulled down to GND through 10k
) and VauxDET is high,
VauxEN# will be asserted when the device is in D0. VauxEN# is always asserted when
VauxDET is high in D3 with PME enabled. Either VauxEN# or VpciEN#, but not both,
can be asserted at the same time.
RXA
66
I(DA)
Receive Analog.
RXA is a single-ended receive data input from the telephone line
interface or an optional external hybrid circuit. The input impedance is > 70k
.
Transmit Analog 1 and 2.
The TXA1 and TXA2 outputs are differential outputs 180
degrees out of phase with each other. Each output can drive a 300
load.
Modem Speaker Analog Output.
The SPKROUT_M analog output reflects the
received analog input signal. The SPKROUT_M on/off and three levels of attenuation
are controlled by bits in DSP RAM. When the speaker is turned off, the SPKROUT_M
output is clamped to the voltage at the VC pin. The SPKROUT_M output can drive an
impedance as low as 300 ohms. In a typical application, the SPKROUT_M output is an
input to an external LM386 audio power amplifier.
TXA1
TXA2
61
62
O(DF)
SPKOUT
60
O(DF)
DSPKOUT
69
OA
Modem Speaker Digital Output.
The DSPKOUT digital output reflects the received
analog input signal digitized to TTL high or low level by an internal comparator to
create a PC Card (PCMCIA)-compatible signal.
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