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MD211
The external bus connects to the MDP, the optional
RCDSVD SCP, and to OEM-supplied memory. The
memory is 1Mbit (128k x 8) SRAM and 2Mbit (256k x 8)
ROM/flash ROM, or for the RC336 and RC144, can
alternatively be 32k x 8 SRAM and 128k x 8 ROM/flash
ROM.
Telephone Line/Telephone Interface
MCU. Relay control outputs to the line interface are
supported:
•
~RLY1: Off-hook (~OH)
•
~RLY2: Voice (~VOICE), if needed. Pulse (~PULSE) relay
function can be enabled by ConfigurACE II.
•
~RLY3: Mute (~MUTE), if needed, can be enabled by
ConfigurACE II.
•
~RLY4: Caller ID (~CALLID) if needed. The DAAs shown
in Figure 3 and Figure 4 support the Caller ID function
without use of a separate relay.
Ring signal (RINGD) and loop current sense (LCS) inputs
are supported.
Telephony extensions are supported by the Extension Off-
Hook (~EXTOH) input.
MDP. A single-ended receive analog input (RIN) and a
differential transmit analog output (TXA1/TXA2) are
supported. A digitized speaker output (SPKMD) is
provided for call progress monitoring.
Speakerphone Interface (SP and SVD Models)
Microphone input (MICV) and a speaker output (SPKM)
lines connect to handset, headset, or a microphone and
speaker to support functions such as AudioSpan headset
and speakerphone modes, FDSP, telephone emulation,
microphone voice record, speaker voice playback, and
call progress monitor. The speaker output (SPKM) carries
the normal speakerphone audio or reflects the received
analog signals in the modem.
An input from the telephone microphone (TELIN) and an
output to the telephone speaker (TELOUT) are supported
in AudioSpan modes. These lines connect voice
record/playback and AudioSpan audio to the local
handset.
RCDSVD SCP Interface (SVD Models)
The Line In (LINEIN) and Line Out (LINEOUT) lines
connect DSVD audio to the local telephone handset.
Microphone input (MICIN) and speaker output (SPKP)
lines connect to the microphone and speaker to support
DSVD headset and speakerphone modes.
Hardware Interface Signals
The modem hardware interface signals are shown in
Figure 5 (serial DTE interface) and Figure 6 (parallel host
interface).
The MCU pin assignments for the 80-pin PQFP with serial
DTE interface are shown in Figure 7.
The MCU pin assignments for the 80-pin PQFP with
parallel host interface are shown in Figure 8.
The MDP pin assignments for the 100-pin PQFP are
shown in Figure 9.
The RCDSVD SCP pin assignments for the 100-pin PQFP
are shown in Figure 10.
Electrical and Environmental Specifications
The current and power requirements are listed in Table 2.
The absolute maximum ratings are listed in Table 3.
Additional Information
Additional information is described in the RC56D,
RC336D, and RC144D Designer’s Guide (Order No.
1154), the Plug and Play (PnP) ISA Bus Interface Device
Data Sheet (Order No. MD144), the RCDVSD Speech
Codec Processor Device Hardware Description (Order
No. 1087), and the AT Command Reference Manual
(Order No. 1199).