256 Mbit parallel NOR Flash in a 64-FBGA footprint
The Infineon S29GL256S10FAIV20 is a 256 Mbit parallel NOR Flash memory from the GL-S series, organized as 16M x 16 bits. The 64-ball FBGA package saves board area compared to TSOP alternatives, though it demands careful PCB layout for signal integrity on the parallel bus.
100 ns access time — timing budget for the bus
The 100 ns access time sets the window for the host controller to latch data after asserting the address. In a system with a 50 MHz bus clock (20 ns period), this allows five clock cycles for address decode, memory access, and data setup. Designs with slower MCUs or stretched bus cycles have margin; high-speed controllers may need to insert wait states. The 60 ns write cycle time for word and page operations is faster than the read access, so write-heavy firmware updates complete quickly once the bus is idle.
Industrial temperature range for outdoor and factory environments
The 2.7 V minimum supply gives headroom for battery-backed or 3.3 V rail designs with some droop. Storage temperature exceeds the operating range — the package and die handle the thermal cycle, but the board-level solder joints need to match the CTE of the FBGA substrate.
The GL-S series is a mature, widely second-sourced NOR Flash family, so supply is stable through both franchised and independent channels.
Parallel interface and 64-FBGA — board-level considerations
The parallel interface uses a 16-bit data bus and separate address lines, which consumes more GPIOs than a serial Flash but delivers faster random read throughput. The 64-ball FBGA (0.8 mm pitch) requires a multi-layer PCB with via-in-pad or dogbone fanout for the inner balls. Decouple with a 100 nF ceramic per supply pin pair, placed as close to the balls as the layout allows.