128 Mbit parallel NOR Flash for code shadowing and execute-in-place
The Infineon S29GL128S11FHIV20 is a 128 Mbit parallel NOR Flash memory from the GL-S family, organized as 8M x 16 bits. It uses a standard parallel interface for direct code execution (XIP) and fast random-access reads, with a 110 ns access time that sets the bus timing budget for the host controller.
The 110 ns access time is the random-read latency from address assertion to valid data on the bus. For a 16-bit wide memory at 1.65 V, this timing determines whether the host controller can run back-to-back reads without wait states. The S29GL128S10TFIV13 sibling offers a 100 ns access time — a 10 ns improvement that may matter for higher-throughput systems, but for most 8/16-bit MCU designs the 110 ns part meets the margin. The write cycle time is 60 ns per word or page, which governs programming throughput during firmware updates.
64-FBGA footprint and supply routing
The 64-ball FBGA package (0.8 mm pitch typical for this class) requires a multilayer PCB with via-in-pad or dogbone fanout for the inner balls. The 1.65 V supply rail should be decoupled with a 100 nF ceramic per supply ball group, placed as close to the balls as the fanout allows. The parallel interface uses separate address, data, and control lines — route them with matched trace lengths to avoid skew at 110 ns cycle times.