NXP Semiconductors DSPB56374AE

Overview

DSPB56374AE from Freescale Semiconductor is a 24-bit programmable digital signal processor (DSP) optimized for real-time audio processing, featuring a 150 MHz internal clock, 150 MIPS performance, 6K×24-bit X/Y data RAM, 20K×24-bit program ROM, and dual Enhanced Serial Audio Interfaces (ESAI/ESAI_1) supporting I2S, AC97, and Sony protocols in automotive infotainment systems.

For engineers reviewing the DSPB56374AE datasheet, DSPB56374AE pinout, DSPB56374AE application, or DSPB56374AE equivalent, key selection criteria include its 80-pin LQFP package, 1.25 V core / 3.3 V I/O supply architecture, six-channel DMA, triple timer module, and GPIO-configurable pins-critical for audio subsystem integration, acoustic equalization, and multi-channel sound field processing.

Technical Context

The DSPB56374AE implements the DSP56300 core with object-code compatibility to the 56K family, integrating a 24×24-bit MAC unit, 56-bit barrel shifter, and two 56-bit accumulators. Its memory architecture supports flexible switching between 2K–10K program RAM and 4K–10K X-data RAM configurations via MSW bits.

It features dual ESAI peripherals-one standard (ESAI) and one enhanced (ESAI_1, 80-pin only)-each supporting up to 6 transmitters and 4 receivers with master/slave operation. The SHI interface provides SPI/I²C dual-mode host connectivity with 10-word FIFO and three noise-reduction filter modes.

Key Specifications

Pinout & Package

Package: 80-pin LQFP (12 mm × 12 mm, 0.5 mm pitch), thermally enhanced with exposed pad. Designed for high-density audio PCB layouts requiring low-noise analog/digital partitioning and robust power decoupling per PLLA/PLLP/PLLD/CORE/IO domains.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital audio DSP applications.

Compared with MC56F8323 and ADSP-21369, the DSPB56374AE uniquely balances 24-bit fixed-point precision, dual native ESAI support, and 150 MIPS at low power-making it optimal for cost-constrained, high-channel-count audio systems requiring zero-latency codec interfacing without external glue logic.

Availability

DSPB56374AE is available at Aetrix Electronics and suitable for automotive infotainment, professional audio equipment, and home theater AV receivers requiring stable component supply across extended product lifecycles.

Supply support for DSPB56374AE includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Freescale Semiconductor (now part of NXP Semiconductors) is a fabless semiconductor company specializing in embedded processing, analog, and connectivity solutions for automotive, industrial, and consumer markets.

The DSP56374AE belongs to the Symphony™ DSP family, designed specifically for high-fidelity digital audio signal processing in resource-constrained, real-time embedded systems with stringent EMI and thermal requirements.

FAQ

What is the maximum operating frequency of the DSPB56374AE core?

The DSPB56374AE operates at a maximum internal clock frequency of 150 MHz, delivering 150 million instructions per second (MIPS). This frequency is generated internally via the integrated PLL using an external crystal or clock source applied to the EXTAL pin. The core logic supply (CORE_VDD) must be stabilized at 1.25 V to sustain this performance level, and the PLL requires separate 1.25 V (PLLD_VDD) and 3.3 V (PLLA_VDD/PLLP_VDD) supplies with strict decoupling.

Does the DSPB56374AE support I²S protocol natively?

Yes, the DSPB56374AE supports I²S natively through both its Enhanced Serial Audio Interface (ESAI) and ESAI_1 peripherals. Each interface can be configured as master or slave and supports I²S, AC97, Sony, and network protocols. The ESAI_1 module is available only in the 80-pin LQFP package and provides additional flexibility for multi-codec systems. Frame sync (FSR/FST) and serial clock (SCKR/SCKT) pins are fully programmable to match I²S timing requirements including left/right justification and delay settings.

How many GPIO pins are available on the DSPB56374AE in the 80-pin package?

The DSPB56374AE provides up to 47 general-purpose I/O pins in the 80-pin LQFP package. These are distributed across Port G (15 dedicated GPIO), Port H (5 multiplexed with MOD/IRQ), and Port C (up to 27 multiplexed with ESAI functions). All GPIOs are individually configurable as input, output, or high-impedance disconnected, with internal pull-up or pull-down resistors enabled per pin. MODA–MODD pins are 5 V tolerant and retain GPIO capability after boot mode selection.

What debug interfaces does the DSPB56374AE include?

The DSPB56374AE integrates IEEE 1149.1-compliant JTAG boundary scan and the OnCE (On-Chip Emulation) interface for real-time hardware/software debugging. OnCE supports breakpoints, watchpoints, register inspection, and memory access without halting real-time audio processing. The JTAG port enables board-level test and programming, while the SHI interface can also be used for host-based firmware updates. No external debug probe is required beyond standard JTAG cabling for full visibility into core state and peripheral registers.

Is the DSPB56374AE pin-compatible with other devices in the DSP56374 family?

Yes, the DSPB56374AE is pin-compatible with the base DSP56374 in the 80-pin LQFP package, sharing identical pin assignments, power domains, and signal groupings. Differences between variants (e.g., DSP56374AF, DSPB56374AE) relate to mask-set revisions, characterization grade (industrial vs. automotive), and minor electrical parameter tolerances-not pinout or functional interface behavior. Designers may substitute within the same package variant without PCB changes, provided thermal and power delivery meet the specific variant's datasheet specifications.