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FM214 Datasheet(PDF) 7 Page - List of Unclassifed Manufacturers |
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FM214 Datasheet(HTML) 7 Page - List of Unclassifed Manufacturers |
7 / 12 page MD205 7 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. |
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