TDA7505 datasheet(28/38 Pages) STMICROELECTRONICS

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Functional description

TDA7505

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5.2

DSP peripherals

There are a number of peripherals that are tightly coupled to the two DSP Cores. Some of

the peripherals are connected to DSP 0 others are connected to DSP 1.

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4k x 24-Bit Program RAM for DSP0

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16k x 24-Bit mask programmable Program ROM for DSP0

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4k x 24-Bit X-Data RAM for DSP0

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4k x 24-Bit Y-Data RAM for DSP0

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4k x 24-Bit Program RAM for DSP1

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16k x 24-Bit mask programmable Program ROM for DSP1

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4k x 24-Bit X-Data RAM for DSP1

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4k x 24-Bit mask programmable X-Data ROM for DSP1

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4k x 24-Bit Y-Data RAM for DSP1

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6 channel Serial Audio Interface (SAI)

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2 channel SPDIF receiver with sampling rate conversion

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I2C and SPI interfaces

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XCHG Interface for DSP to DSP communication

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External Memory Interface (DRAM/SRAM) for time-delay and traffic information

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Debug Port for both DSP´s

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General-purpose Input/Output lines

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Asynchronous Sample Rate Converter

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SINCOS co-processor

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PLL Clock Oscillator

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ADC´s, ADC input multiplexer and DAC´s (see Section 5.2.12: CODEC on page 32)

5.2.1

Data and program memories

Both DSP0 and DSP1 have data and program memories attached to them. Each memory

type is described below:

X-RAM

This is a 24-Bit Single Port SRAM used for storing coefficients. The 16-Bit XRAM address,

XABx(15:0) is generated by the Address Generation Unit of the DSP core. The 24-Bit XRAM

Data, XDBx(23:0), may be written to and read from the Data ALU of the DSP core.

X-ROM

This is a 24-Bit Single Port mask programmable ROM used for storing coefficients. The 16-

Bit XRAM address, XABx(15:0) is generated by the Address Generation Unit of the DSP

core. The 24-Bit XRAM Data, XDBx(23:0), may be read from the Data ALU of the DSP core.

Y-RAM

This is a 24-Bit Single Port SRAM used for storing coefficients. The 16-Bit address,

YABx(15:0) is generated by the Address Generation Unit of the DSP core. The 24-Bit Data,

YDBx(23:0), is written to and read from the Data ALU of the DSP core.

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