NXP Semiconductors DSPB56374AF

Overview

DSPB56374AF 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, 24×24-bit MAC unit with 56-bit barrel shifter, six-channel DMA, and dual Enhanced Serial Audio Interfaces (ESAI/ESAI_1). It targets high-fidelity sound field processing and acoustic equalization in professional audio systems.

For engineers reviewing the DSPB56374AF datasheet, DSPB56374AF pinout, DSPB56374AF application, or DSPB56374AF equivalent, this page delivers verified technical context, package-specific pin mapping, functional alternatives, and design-critical timing and memory configuration details - all confirmed for the 80-pin LQFP variant with ESAI_1 support.

Technical Context

The DSPB56374AF implements the DSP56300 core architecture with object-code compatibility to the 56K family, supporting position-independent code and static CMOS operation down to DC. Its PLL provides programmable frequency multiplication (1–255), predivider (1–31), and output division (1/2/4), enabling precise clock synthesis for multi-protocol audio interfaces.

It integrates dual ESAI modules (ESAI and ESAI_1), each supporting I2S, Sony, AC97, and network protocols with up to 6 transmitters and 4 receivers; ESAI_1 is available exclusively in the 80-pin LQFP package. The SHI supports both SPI and I2C with 10-word FIFO, 8/16/24-bit word lengths, and three noise-reduction filter modes.

Key Specifications

Pinout & Package

Package: 80-pin LQFP (12 mm × 12 mm, 0.5 mm pitch), RoHS-compliant, thermal pad exposed on bottom for enhanced heat dissipation in audio amplifier and codec applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADSP-21369 and TMS320C6748, the DSPB56374AF delivers superior audio-specific I/O density (dual ESAI + SHI), lower latency for fixed-point FIR filtering (<1.2 µs per tap), and smaller footprint - making it optimal for cost-sensitive, latency-critical embedded audio where protocol flexibility outweighs raw MFLOPS.

Availability

DSPB56374AF is available at Aetrix Electronics and suitable for professional audio mixer development, automotive infotainment head units, and studio-grade audio interface production requiring stable component supply and long-term lifecycle assurance.

Supply support for DSPB56374AF 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 DSP56374AF belongs to the Symphony™ DSP family, designed specifically for high-fidelity digital audio signal processing in resource-constrained embedded systems with strict real-time latency requirements.

FAQ

What is the maximum operating frequency of the DSPB56374AF core?

The DSPB56374AF core operates at a maximum internal frequency of 150 MHz, delivering 150 million instructions per second (MIPS). This clock is generated internally via the integrated PLL from an external 1–50 MHz crystal or clock source applied to the EXTAL pin. The core's static CMOS design allows stable operation at any frequency down to DC, supporting ultra-low-power modes.

Does the DSPB56374AF support I2S protocol on both ESAI interfaces?

Yes, the DSPB56374AF supports I2S on both ESAI and ESAI_1 interfaces. Each ESAI module is fully programmable for I2S, Sony, AC97, and custom network protocols in master or slave mode. ESAI_1 is available only in the 80-pin LQFP package and enables concurrent I2S connections to separate audio subsystems - for example, one ESAI driving front speakers and ESAI_1 handling surround channels.

How many GPIO pins are available on the DSPB56374AF in the 80-pin LQFP package?

The DSPB56374AF provides up to 47 GPIO pins in the 80-pin LQFP package. These include dedicated Port G (15 pins), multiplexed Port H (5 pins), Port C (12 pins, shared with ESAI), Port E (12 pins, shared with ESAI_1), and Port D (3 pins). All GPIO-capable pins support programmable input/output/disconnect states and feature internal pull-up or pull-down resistors as specified in the datasheet.

Is the DSPB56374AF pin-compatible with other members of the DSP563xx family?

No, the DSPB56374AF is not pin-compatible with earlier DSP563xx devices such as the DSP56303 or DSP56309. While it shares architectural compatibility (object-code compatibility with the 56K core), its 80-pin LQFP package, dual ESAI layout, and dedicated PLL power pins (PLLA_VDD/PLLD_VDD) require unique PCB routing. Migration requires board redesign but preserves software investment through instruction set compatibility.

What debug interfaces does the DSPB56374AF provide for firmware development?

The DSPB56374AF includes the OnCE (On-Chip Emulation) module with full IEEE 1149.1 JTAG boundary-scan support. This enables real-time hardware debugging, instruction-level stepping, memory/register inspection, and non-intrusive breakpoint insertion - all without halting audio processing. The JTAG port also supports boundary-scan testing for manufacturing verification and interconnect validation.