DS56-L490-001 Просмотр технического описания (PDF) - Conexant Systems

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DS56-L490-001

V.90/K56flex™ PC Card Device Sets for Host-Controlled, Low Power Applications

Conexant Systems 

V.90/K56flex PC Card Device Sets for Host-Controlled, Low Power Applications

HCFL/56

Cellular Phone Support

Cell phone operation is supported by a generic

hardware interface conforming to multiple standards,

and by host software for specific cell phone types.

Conexant provides a software developer’s kit to

assist with software development for specific cell

phone types. The kit enables straightforward porting

of analog cell phone drivers to the modem. Refer to

the software release notes for a list of the latest

supported cell phone models.

Modem Data Pump (MDP)

The data/fax/voice/speakerphone modem data pump

(MDP) is a Conexant R6785 packaged in a 144-pin

TQFP or an R6764 packaged in a 100-pin PQFP.

The input clock frequency is 28.224 MHz and is

supplied by the L5502-11 PCMCIA BIF. An internal

phase locked loop (PLL) circuit supports 56.448 MHz

internal operation. The operating voltage is +3.3V

supplied by the L5502-11 PCMCIA BIF with +5V

tolerant inputs. The R6785 supports either +3.3V

(~SET3V is tied to AGND) or +5V (~SET3V pin is

NC) analog signal interface; the R6764 supports

+3.3V analog signal interface.

Supported Interfaces

The major hardware signal interfaces of the modem

device set are identified in Figure 4.

PCMCIA Bus Interface (L5502-11 BIF)

The L5502-11 PCMCIA BIF connects to a PC Card

socket via built-in PC Card interface and is packaged

in a 128-pin TQFP. The operating voltage is +3.3V

with +5V tolerant inputs.

The L5502-11 PCMCIA BIF performs the host

interface functions. The crystal frequency is 28.224

MHz. The device outputs a 28.224 MHz clock to the

MDP eliminating need for a separate MDP crystal

circuit.

The L5502-11 PCMCIA BIF connects to the MDP via

dedicated lines and the external bus. The L5502-11

PCMCIA BIF also has 32 kbytes of internal RAM.

PC Card Interface

The L5502-11 PCMCIA BIF incorporates a built-in

PC Card interface and CIS memory allowing the

L5502-11 PCMCIA BIF to directly connect to the PC

Card 68-pin socket without requiring external PICA

and CIS devices.

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.

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 internal modified

ROM code 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

The Card Information Structure (CIS) is also

addressed in attribute memory, and contains

information about the PC Card and its features.

The address decode logic controls access to the

card configuration registers in attribute memory,

decodes valid accesses to the CIS, generates chip

selects to the Ethernet controller and to the modem,

and generates the input acknowledge signal

(-INPACK) to the host.

Doc. No. 100586C

Conexant

7

November 10, 1999

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