STMicroelectronics DSM2180F3-90T6

Overview

DSM2180F3-90T6 from Lattice Semiconductor is a programmable DSP system memory device designed for seamless integration with Analog Devices ADSP-218X family DSPs. It integrates 128 KB (128K × 8) Flash memory, a 3,000-gate CPLD with 16 macrocells, up to 16 configurable I/O pins, and JTAG in-system programming - all operating at 5 V ±10% with 90 ns access time in PQFP52 package. It enables glueless bootloading via Byte DMA and external data overlay memory access for firmware updates in battery-powered embedded audio or telecom signal processing systems.

For engineers reviewing the DSM2180F3-90T6 datasheet, DSM2180F3-90T6 pinout, DSM2180F3-90T6 application, or DSM2180F3-90T6 equivalent, key selection criteria include BDMA vs. DMS memory access modes, sector-protected Flash erasability (100K cycles), PLD runtime macrocell register accessibility via DSP data bus, and zero-power standby current (75 µA) for low-power DSP co-processor designs.

Technical Context

The DSM2180F3-90T6 implements a dual-mode memory interface: Byte DMA (BMS strobe) for high-speed boot code loading and Data Memory Overlay (DMS strobe) for byte-wise Flash programming without BDMA channel reinitialization. Its Decode PLD (DPLD) dynamically maps eight 16 KB Flash sectors across the ADSP-218X address space using an 8-bit Page Register updated in real time.

Its Complex PLD (CPLD) contains 16 input macrocells (IMCs) for debounced I/O sampling and 16 output macrocells (OMCs) directly connected to the DSP data bus - enabling real-time read/write of shifter/counter state registers. Both PLDs support Turbo/Non-Turbo mode switching via runtime control registers to balance propagation delay (<15 ns combinatorial) and power consumption.

Key Specifications

Pinout & Package

DSM2180F3-90T6 is housed in a 52-pin Plastic Quad Flatpack (PQFP52) package with 0.65 mm lead pitch, compliant with JEDEC MS-026. Thermal resistance θ_JA = 45°C/W supports operation up to +70°C ambient in compact DSP carrier boards.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar DSP system memory applications.

Compared with DSM2180F3-90T6, the -70T6 variant reduces memory access latency for higher-clock DSPs but offers no functional extension, while the DSM2181F3-90T6 adds SRAM at the cost of register compatibility - making the -90T6 optimal for pure Flash-overlay+PLD expansion in cost- and power-sensitive ADSP-218X designs.

Availability

DSM2180F3-90T6 is available at Aetrix Electronics and suitable for telecom voice processing, industrial motor control, portable audio recorders, and medical signal analyzers requiring stable component supply across multi-year production cycles.

Supply support for DSM2180F3-90T6 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

Lattice Semiconductor is a fabless provider of programmable logic devices, specializing in low-power FPGA, CPLD, and system memory solutions for embedded control and signal processing.

The DSM (Digital Signal Processor System Memory) product line targets ADSP-218X users needing integrated Flash, PLD, and I/O in a single chip - reducing board area, EMI, and power versus discrete memory + PLD implementations.

FAQ

What is the role of the Page Register in DSM2180F3-90T6 operation?

The 8-bit Page Register is a runtime-accessible csiop control register that directly feeds address translation logic in both the Decode PLD and Complex PLD. It determines which of the eight 16 KB Flash sectors is mapped into the current DSP external data overlay window, enabling dynamic firmware partitioning without hardware address decoding changes.

Can the PLD logic be modified after the device is soldered to the PCB?

Yes - the CPLD and DPLD configuration is stored in Flash memory and reprogrammable via JTAG ISP at any time, even in the final assembled product. No socket or UV erasure is needed; programming takes 10–20 seconds using a FlashLINK™ cable connected to a standard PC parallel port.

How does the security bit affect DSP access to Flash memory?

When the security bit is set, JTAG programmers cannot read or write Flash or PLD configuration, but the ADSP-218X DSP retains full read access to Flash contents through its AD0–AD7 data bus. This allows secure field deployment of boot code while permitting runtime execution and overlay data reads.

What is the difference between BDMA and DMS access modes for Flash memory?

BDMA (Byte DMA) uses the BMS strobe for high-speed sequential Flash reads during bootloading, but requires full channel setup per byte for writes. DMS (Data Memory Overlay) uses the DMS strobe to treat Flash as standard external RAM - enabling simpler, faster byte-wise writes without DMA overhead, though only the upper byte of each 16-bit DSP word is written.