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参数资料
| 型号： | RH56D-PCI |
| 厂商： | Conexant Systems, Inc. |
| 英文描述： | Host Controlled V.90/K56flex Modem device |
| 中文描述： | 主机控制V.90/K56flex调制解调器设备 |
| 文件页数： | 14/60页 |
| 文件大小： | 357K |
| 代理商： | RH56D-PCI |
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RH56D-PCI Modem Designer’s Guide
1-8
Conexant
1213
Conexant Proprietary Information
Serial EEPROM Interface
A serial EEPROM is required to store the Maximum Latency, Minimum Grant, Device ID, Vendor ID, Subsystem ID, and
Subsystem Vendor ID parameters for the PCI Configuration Space Header. The serial EEPROM interface connects to an
Microchip 93LC66B (256 x 16), 93LC56B (128 x 16), Atmel AT93C66 (256 x 16), AT93C56 (128 x 16), or equivalent serial
EEPROM rated at 1 MHz (SROMCLK is 537.6 kHz). Its size can be reduced from the total of 4096 (256 x 16) bits down to
2048 (128 x 16) bits in non-PC card applications.
The interface signals are: a serial data input line from the EEPROM (SROMIN), a serial data output line to the EEPROM
(SROMOUT), Clock to the EEPROM (SROMCLK), and chip select to the EEPROM (SROMCS). The EEPROM is
programmable by the PC via the R6795 device (see Section 5.3).
Audio Interface
A digital speaker output (DSPKOUT), or analog speaker output (SPKOUT) available in the SP models, is supported on
separate pins, as selected by a bit in the INF file. Both outputs cannot be active at the same time.
The digital speaker output (DSPKOUT) provides square wave call progress or carrier signals, which can be optionally
connected to a low-cost on-board speaker, e.g., a sounducer, without the use of an external op-amp. This output is used for
call progress in Data/Fax mode only where sound quality is not important.
The MIC_V and SPKOUT lines, supported in SP model, connect to an external microphone and external speaker to support
functions such as speakerphone mode, telephone emulation, microphone voice record, speaker voice playback, and call
progress monitor. The SPKOUT output should be used in speakerphone designs where sound quality is important.
The analog microphone input (MIC_V) can also accept an external audio signal to support functions such as speakerphone
mode, telephone emulation, microphone voice record, and music on hold.
Also, for the SP models, a telephone input (TELIN) is supported for optionally connecting the modem to a telephone handset
microphone and a telephone output (TELOUT) is supported for optionally connecting the modem to a telephone handset
speaker.
Telephone Line/Telephone/Audio Interface
The Telephone Line/Telephone/Audio Signal Interface can support a 3-relay telephone line interface (Figure 1-3). Signal
routing for Voice mode is shown in Table 1-2.
The following signals are supported:
A single-ended Receive Analog input (RXA) input and a differential Transmit Analog output (TXA1 and TXA2) output.
An Off-hook (OH#) relay control output for connecting the modem to the telephone line.
A Caller ID (CID) relay control output for optionally connecting the telephone line to the modem for Caller ID data extraction.
A Voice (VOICE#) relay control output for optionally switching the telephone line connection between the modem and the
telephone handset.
A Ring Indicate (IRING#) input for sensing a raw incoming ring signal.
A Loop Current Sense (LCS#) input for optionally sensing the local primary telephone off-hook status.
An Extension Off-Hook (EXT_L#) input for optionally sensing local extension telephone off-hook status.
Remote Hang-up (LCS_L#/RH_L#) input for optionally sensing remote telephone off-hook status.
Telephone input (TELIN) for connection to a microphone or telephone handset (SP model).
Telephone output (TELOUT) for connection to a speaker or telephone handset (SP model).
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