EPCQ-A Serial Configuration Device Datasheet

ID 683818
Date 10/01/2019
Document Table of Contents

1.8.2. Write Status Operation

The write status operation does not affect the write enable latch and write in progress bits. You can use the write status operation to set the status register block protection and top or bottom bits. Therefore, you can implement this operation to protect certain memory sectors. After setting the block protect bits, the protected memory sectors are treated as read-only memory. You must execute the write enable operation before the write status operation.

Figure 5. Write Status Operation Timing Diagram

Immediately after the nCS signal drives high, the device initiates the self-timed write status cycle. The self-timed write status cycle usually takes 10 ms for all EPCQ-A devices and is guaranteed to be less than 15 ms. For details about tWS , refer to the related information below. You must account for this delay to ensure that the status register is written with the desired block protect bits. Alternatively, you can check the write in progress bit in the status register by executing the read status operation while the self-timed write status cycle is in progress. Write in progress bit is 1 during the self-timed write status cycle and 0 when it is complete.