37.14 External Wait

Any access can be extended by an external device using the NWAIT input signal of the SMC. The EXNW_MODE field of the HSMC_MODE register on the corresponding chip select must be set to either ‘10’ (Frozen mode) or ‘11’ (Ready mode). When the EXNW_MODE is set to ‘00’ (disabled), the NWAIT signal is simply ignored on the corresponding chip select. The NWAIT signal delays the read or write operation related to the read or write controlling signal, depending on the Read and Write modes of the corresponding chip select.