TDA7505 Datasheet, PDF (27/38 Pages) STMicroelectronics – Car radio DSP for advanced signal processing

TDA7505
5
Functional description
Functional description
The TDA7505 is broken up into three distinct blocks. One block contains the two DSP Cores
and their associated peripherals. The second contains the analog modules ADC with input
multiplexer and level adjust and the DAC. The third module contains the RDS processing:
filter, demodulator, decoder with error correction and the I²C/SPI interface with data buffer
and interrupts output.
5.1
24-bit DSP core
The two DSP cores are used to process the audio and FM/AM data, coming from the ADC,
or any kind of digital data coming via SPDIF or SAI. After the digital signal processing these
data are sent to the DAC for analog conversion. Functions such as volume, tone, balance,
and fader control, as well as spatial enhancement and general purpose signal processing
may be performed by the DSP0. When FM/AM mode is selected, DSP1 is fully devoted to
AM/FM processing. Nevertheless it can be used for any kind of different application, when a
different input source is selected. Some capabilities of the DSPs are listed below:
● Single cycle multiply and accumulate with convergent rounding and condition code
generation
● 2 x 56-bit Accumulators
● Double precision multiply
● Scaling and saturation arithmetic
● 48-bit or 2 x 24-bit parallel moves
● 64 interrupt vector locations
● Fast or long interrupts possible
● Programmable interrupt priorities and masking
● Repeat instruction and zero overhead DO loops
● Hardware stack capable of nesting combinations of 7 DO loops or 15
interrupts/subroutines
● Bit manipulation instructions possible on all registers and memory locations, also Jump
on bit test
● 4 pin serial debug interface
● Debug access to all internal registers, buses and memory locations
● 5 word deep program address history FIFO
● Hardware and software breakpoints for both program and data memory accesses
● Debug Single stepping, Instruction injection and Disassembly of program memory
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