The minimum timing requirement for EM_WAIT pulse duration is 2 EMA_CLK period.
When EM_WAIT is less than 2 EMA_CLK period, may the Extended Wait be performed?
Our customer traced the Asynchronous Memory Write Timing with Extended Wait Mode. It as follows:
EMA_CLK clock frequency: 62.5MHz (16nsec)
CE3CFG.W_SETUP：1 EMA_CLK period
CE3CFG.W_STROBE：4 EMA_CLK period
CE3CFG.W_HOLD：1 EMA_CLK period
AWCC.CS3_WAIT:01b (EMA_WAIT[1] pin is used)
AWCC.WP1: 0b (EMA_WAIT[1] pin is low)
AWCC.MAX_EXT_WAIT: 80h
The strobe period is expanded to 5 EMA_CLK period. While EMA_CS3 is asserted, the duration of asserted EM_WAIT is less than 2 EMA_CLK period.
Best regards,
Daisuke