GENERAL DESCRIPTION
   The GD25S512MD (2 x 256M-bit) Serial MCP (Multi Chip Package) Flash memory is based on the popular GD25B series by stacking two individual GD25B256D dies into a standard 8-pin package. It offers the highest memory density for the low pin-count package, as well as Concurrent Operations in Serial Flash memory for applications that demand high Program/Erase data throughput.
   The GD25S512MD Serial flash supports the standard Serial Peripheral Interface (SPI), and the Dual/Quad SPI: Serial Clock, Chip Select, Serial Data I/O0 (SI), I/O1 (SO), I/O2, and I/O3. The Dual SPI data is transferred with speed of 208Mbit/s and the Quad SPI data is transferred with speed of 416Mbit/s.