V.90/K56flex Modem Device Sets with SmartDAA Technology for Low Power Applications

SmartACFL



Doc. No. 100444A

Conexant

7

Proprietary Information

Hardware Description

SmartDAA

 technology (patent pending) eliminates

the need for a costly analog transformer, relays, and

opto-isolators that are typically used in discrete DAA

implementations. The programmable SmartDAA

architecture simplifies product implementation in

worldwide markets by eliminating the need for

country-specific components.

Microcontroller (MCU/MCUP)

The microcontroller is a Conexant 8-bit

microcomputer with pins to support serial

DTE/parallel host bus/PC Card, MDP, voice/TAM,

speakerphone, and RCDSVD SCP interface

operation. The operating voltage is +3.3V with +5V

tolerant inputs.

The MCUP incorporates a built-in PC Card interface

and CIS memory allowing the MCUP to directly

connect to the PC Card 68-pin socket without

requiring external PICA and CIS devices.

The MCU connects to the DTE/host via a V.24

(EIA/TIA-232-E) serial DTE interface or a parallel

host bus depending on installed firmware, whereas

the MCUP connects to a PC Card socket via built-in

PC Card interface. Unless otherwise stated,

references to general microcontroller functions

include both the MCUP and MCU.

The MCU performs the command processing and

host interface functions. The crystal frequency is

28.224 MHz. The MCU outputs a 28.224 MHz clock

to the MDP eliminating need for a separate MDP

crystal circuit.

The MCU connects to the MDP via dedicated lines

and the external bus. The external bus also connects

to OEM-supplied RAM (56 models), ROM/flash

ROM, and to the optional RCDSVD SCP.

The MCU connects to a serial EEPROM over a

dedicated serial interface.

Two independent functions are supported; the

modem function and an optional user-defined

Function 2. A Card Option Configuration Register

and a Configuration and Status Register for each

function allow independent configuration/control and

status reporting of the respective function.

The MCUP PC Card interface features include:

• PC Card interface logic and memory

− Internal 512-byte Card Information Structure

(CIS) provides the tuple information needed to

define the PC Card functionality.

− CIS Table is configurable from ROM/flash

memory (default) or from NVRAM (option)

− Address decode logic

• Modem Function

− Decoding for standard COM ports in

Overlapping I/O Address Mode

− Independent I/O Address Mode support

− Power-down mode control

− Digital speaker pass-through

− Supports two ring handling methods

− Ring Indicate pass-through to Status Change

− Six 8-bit Modem Function Card Configuration

Registers

Configuration Option Register (full support)

Configuration and Status Register (full support)

Pin Replacement Register (CREADY and

RREADY)

Extended Status Register (RIEvt and RIEnab)

I/O Base Register 0

I/O Base Register 1

• Optional User-defined Function 2

− Reset and chip select control

− Power-down mode control

− 16-bit data transfer control

− Disable EEPROM control

− Interrupt request pass through

− Four 8-bit Card Configuration Registers

Configuration Option Register (full support)

Configuration and Status Register (full support)

I/O Base Register 0

I/O Base Register 1

• MCU and MCUP packaged in 128-pin TQFP