1. GENERAL DESCRIPTION The W25Q128BV （8M-bit） Serial Flash memory provides a storage solution for systems with limited space， pins and power. The 25Q series offers flexibility and performance well beyond ordinary Serial Flash devices. They are ideal for code shadowing to RAM， executing code directly from Dual/Quad SPI （XIP） and storing voice， text and data. The device operates on a single 2.7V to 3.6V power supply with current consumption as low as 4mA active and 1μA for power-down. The W25Q128BV array is organized into 65，536 programmable pages of 256-bytes each. Up to 256 bytes can be programmed at a time. Pages can be erased in groups of 16 （4KB sector erase）， groups of 128 （32KB block erase）， groups of 256 （64KB block erase） or the entire chip （chip erase）。 The W25Q128BV has 4，096 erasable sectors and 256 erasable blocks respectively. The small 4KB sectors allow for greater flexibility in applications that require data and parameter storage. （See Figure 2.） The W25Q128BV supports the standard Serial Peripheral Interface （SPI）， and a high performance Dual/Quad output as well as Dual/Quad I/O SPI： Serial Clock， Chip Select， Serial Data I/O0 （DI）， I/O1 （DO）， I/O2 （/WP）， and I/O3 （/HOLD）。 SPI clock frequencies of up to 104MHz are supported allowing equivalent clock rates of 208MHz （104MHz x 2） for Dual Output and 280MHz （70MHz x 4） for Quad SPI when using the Fast Read Quad SPI instructions. These transfer rates can out perform standard Asynchronous 8 and 16-bit Parallel Flash memories. The Continuous Read Mode allows for efficient memory access with as few as 8-clocks of instruction-overhead to read a 24-bit address， allowing true XIP （execute in place） operation. A Hold pin， Write Protect pin and programmable write protection， with top， bottom or complement array control， provide further control flexibility. Additionally， the device supports JEDEC standard manufacturer and device identification with a 64-bit Unique Serial Number.

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