32 Mbit parallel NOR — what the access time means for the bus
The S29GL032N90DFI020: This is a 32 Mbit parallel NOR Flash organized as 4M x8 or 2M x16, accessed through a standard parallel interface. The 90 ns access time sets the ceiling for random-read throughput — each read cycle takes 90 ns minimum, so the host controller must insert wait states if its bus clock period is shorter than that. For code-execution-in-place (XIP) designs, the 90 ns figure governs the maximum clock rate at which the CPU can fetch instructions directly from the Flash without a cache. Supply voltage is 2.7 V nominal, which places it in the 2.7–3.6 V range typical of legacy parallel NOR parts. The write cycle time for word and page operations matches the read access at 90 ns, meaning page-program bursts complete at the same bus rate as reads.
Industrial temperature grade — -40 to 85°C
The non-volatile memory retains data across this range without refresh, which is the standard expectation for NOR Flash in harsh environments.