NXP Semiconductors DSPB56721AG

Overview

DSPB56721AG from Freescale Semiconductor is a dual-core 24-bit audio DSP designed for high-fidelity automotive and consumer audio systems. It delivers 200 MIPS per core at 200 MHz internal clock, integrates two DSP56300 cores, on-chip ASRC, ESAI, S/PDIF, and Inter-Core Communication (ICC), and targets Dolby TrueHD and DTS-HD decoding in A/V receivers and car audio amplifiers.

For engineers reviewing the DSPB56721AG datasheet, DSPB56721AG pinout, DSPB56721AG application, or DSPB56721AG equivalent, this page provides verified package mapping (80-pin LQFP), confirmed core architecture, validated audio interface timing (ESAI, S/PDIF), real-world power specs (1.0 V core / 3.3 V I/O), and documented alternative options for multi-core audio processor selection.

Technical Context

The DSPB56721AG implements two independent DSP56300 24-bit cores sharing 64 KB of on-chip memory across eight 8-KB blocks, with dedicated arbitration for concurrent access. Its clock system supports external crystal (24.576 MHz typical) or square-wave input, generating internal 200 MHz core clocks via PLL with VCO range 200–400 MHz.

Unlike the DSP56720, the DSPB56721AG omits the External Memory Controller (EMC) and SDRAM interface, confirming its role as a self-contained audio processor optimized for fixed-function, low-latency signal chains rather than expandable memory architectures.

Key Specifications

Pinout & Package

Package: 80-pin plastic LQFP, 14 mm × 14 mm, 0.65 mm pitch, exposed pad (thermal enhancement).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multi-core audio processor applications.

Compared with AK4182A and TMS320C6748, the DSPB56721AG provides uniquely integrated audio-specific hardware - including dual 200-MIPS cores, four ESAI ports, ASRC, and S/PDIF PHY - enabling faster time-to-market for high-channel-count, low-latency audio systems without external interface components.

Availability

DSPB56721AG is available at Aetrix Electronics and suitable for automotive infotainment, premium A/V receivers, professional recording equipment, and Blu-ray player designs requiring stable component supply and long-term industrial availability.

Supply support for DSPB56721AG 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 global leader in automotive and industrial microcontrollers and analog solutions, with deep expertise in real-time signal processing and functional safety.

The DSP5672x family was engineered specifically for high-performance, low-latency audio processing in resource-constrained embedded systems - emphasizing deterministic interrupt response, integrated audio peripherals, and automotive-grade reliability.

FAQ

What is the core voltage requirement for stable operation of the DSPB56721AG?

The DSPB56721AG requires a tightly regulated 1.0 V ±10% (0.9 V to 1.1 V) core supply (CORE_VDD) for stable operation at 200 MHz. Automotive-grade units specify 0.95 V to 1.05 V. Power-on ramp time must be less than 10 ms to ensure correct POR behavior. IO_VDD must be applied before CORE_VDD to prevent latch-up - the DSPB56721AG datasheet mandates this sequencing.

Does the DSPB56721AG support external SDRAM expansion like the DSP56720?

No, the DSPB56721AG does not include an External Memory Controller (EMC) and cannot interface with external SDRAM. This is a deliberate architectural distinction from the DSP56720, which features EMC support. The DSPB56721AG relies solely on its 64 KB on-chip shared memory and dual-core local memories - making it suitable for fixed-function audio applications where external memory bandwidth is unnecessary.

How many ESAI ports does the DSPB56721AG provide, and what configurations are supported?

The DSPB56721AG provides four independent Enhanced Serial Audio Interface (ESAI) modules: ESAI, ESAI_1, ESAI_2, and ESAI_3. Each supports I²S, left-justified, right-justified, and TDM formats with programmable word length (8–32 bits) and channel count (up to 16 per port). All four operate concurrently, enabling simultaneous connection to multiple DACs, ADCs, or digital audio transceivers without multiplexing.

Is the DSPB56721AG pin-compatible with other members of the DSP5672x family?

The DSPB56721AG is available in an 80-pin LQFP package, while the DSP56720 uses a 144-pin LQFP and the DSP56721 also has a 144-pin variant. There is no pin-to-pin compatibility between the 80-pin DSPB56721AG and either 144-pin variant. Pin assignments differ significantly - especially for memory interface signals absent in the 80-pin version - so PCB layout is not interchangeable.

What audio decoding standards are supported by the DSPB56721AG's software architecture?

The DSPB56721AG's plug-and-play software architecture natively supports Dolby Digital+, Dolby TrueHD, DTS-HD, and legacy Dolby Digital and DTS decoding algorithms. These are implemented in optimized assembly for the DSP56300 cores and leverage on-chip ASRC and ESAI hardware to meet real-time deadlines. Freescale's Symphony SDK provides certified reference implementations compliant with Dolby and DTS licensing requirements - verified for use with the DSPB56721AG.