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FM209-VS

9600/14400 bps MONOFAX Modem Family

Conexant Systems 

 

 


Software Interface

Modem functions are implemented in firmware

executing in the modem DSP. The DSP RAM interface

memory bits, access functions, codes, and registers

are defined in the Designer’s Guide.

Interface Memory

The DSP communicates with the host processor by

means of a dual-port, interface memory. This interface

memory contains thirty-two 8-bit registers, labeled

register 00h through 1Fh. Each register can be read or

written by the host and the DSP.

The host controls the modem operation by writing

control bits to DSP interface memory and writing

parameter values to DSP RAM through interface

memory. The host monitors the modem operation by

reading status bits from DSP interface memory and

reading parameter values from DSP RAM through

interface memory. An interface memory interrupt is

provided.

DSP RAM Access

The DSP contains 16-bit word RAM. Because the DSP

is optimized for performing complex arithmetic, the

RAM is organized into real (X RAM) and imaginary (Y

RAM) parts. The host processor can read or write both

the X RAM and the Y RAM.

DSP interface memory mediates data exchange

between the host and DSP RAM. The address stored

in interface memory RAM address registers by the

host determines the DSP RAM address for data

access.

MD205

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