Infineon Technologies S29WS256PABBFW000

Overview

S29WS256PABBFW000 from Cypress Semiconductor is a 256 Mb (16 M × 16-bit) 1.8 V simultaneous read/write NOR Flash memory using 90 nm MirrorBit™ technology, supporting zero-latency concurrent operations across two independent banks, with 104 MHz burst read capability and 80 ns asynchronous access time - deployed in wireless baseband processors for firmware storage and real-time code execution.

For engineers reviewing the S29WS256PABBFW000 datasheet, S29WS256PABBFW000 pinout, S29WS256PABBFW000 application, or S29WS256PABBFW000 equivalent, key selection criteria include 1.7–1.95 V single-supply operation, 32-word write buffer, dual boot sector configuration, CFI compliance, and FBGA-84 package compatibility with MCP footprint requirements.

Technical Context

This device implements a sixteen-bank architecture with separate address/data paths per bank, enabling true simultaneous read and write without arbitration delay. It supports both synchronous burst (with CLK-driven address increment) and asynchronous modes, with handshaking via RDY output and hardware protection via WP# on top/bottom 16 Kword sectors.

The memory includes a Secured Silicon Sector (128 words factory + 128 words customer), persistent/password-based Advanced Sector Protection, and programmable linear burst modes (8/16/32-word). Erase suspend/resume and unlock bypass commands allow deterministic timing control during field updates.

Key Specifications

Pinout & Package

Package: 84-ball Fine-Pitch BGA (VBH084), 11.6 mm × 8.0 mm, lead-free (Pb-free), MCP-compatible footprint with 0.80 mm ball pitch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar NOR Flash memory applications.

Compared with MX25L25673FMI-10G and S29GL256S11TFI010, the S29WS256PABBFW000 uniquely delivers 1.8 V simultaneous operation with RDY handshaking, CFI auto-configuration, and integrated secure key storage - making it the only option for deterministic firmware updates in wireless and safety-certified systems.

Availability

S29WS256PABBFW000 is available at Aetrix Electronics and suitable for wireless infrastructure, automotive telematics, industrial gateways, and medical imaging systems requiring stable component supply with long-term lifecycle assurance.

Supply support for S29WS256PABBFW000 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

Cypress Semiconductor (now part of Infineon Technologies) designs high-performance, low-power memory and microcontroller solutions for embedded and connectivity applications.

The S29WS-P family targets wireless and automotive platforms needing deterministic, high-density NOR Flash with simultaneous access and robust security - optimized for 1.8 V SoC integration and firmware-over-the-air (FOTA) reliability.

FAQ

What is the function of the ACC pin on S29WS256PABBFW000?

The ACC (Acceleration) pin accepts VHH (~VCC + 2.5 V) to enable factory-programming acceleration and automatic entry into unlock bypass mode. When driven to VHH, it reduces single-word programming time from 40 µs to 6 µs (VACC) and bypasses standard command sequences. At VIL, it disables all program/erase functions - serving as a hardware safety interlock.

Does S29WS256PABBFW000 support true XIP (eXecute-In-Place)?

Yes - its 104 MHz synchronous burst read and zero-latency simultaneous read/write enable direct code execution from Flash without copying to RAM. The RDY handshake ensures precise timing alignment between CPU fetch cycles and Flash output readiness, meeting strict XIP timing budgets in ARM Cortex-A/R-based wireless basebands.

How is hardware write protection implemented on this device?

Hardware write protection is implemented via the WP# pin, which - when pulled low - permanently disables program and erase operations in the four outermost 16 Kword sectors (top and bottom). This protects boot code regions from accidental or malicious overwrite, independent of software commands or power cycling, and remains active even after reset.

Can S29WS256PABBFW000 operate in both synchronous and asynchronous modes on the same bus?

Yes - the device automatically detects mode based on CLK state: when CLK is held static (VIH or VIL), it operates asynchronously using CE#/OE#/WE#; when CLK toggles, it enters synchronous burst mode with address incrementing on each active edge. Mode switching requires no reconfiguration - enabling hybrid use cases like async initialization followed by burst code fetch.