Table of Contents
Advertisement
21.6.1 Putting flash memory into read/reset status
This section describes how to place the flash memory in the read/reset status by
issuing the Read/Reset command.
I Placing the flash memory in read/reset status
The flash memory can be placed in the read/reset status by continuously transmitting the Read/
Reset command form the command sequence table to sectors in the flash memory.
The Read/Reset command provides two command sequences. One uses one bus cycle, the
other uses three bus cycles. Other than that, there is no essential difference between these two
sequences.
The read/reset status is the initial status of the flash memory. If a command terminates normally
when the power supply is on, the flash memory always enters the read/reset status. The read/
reset status means that the flash memory is waiting for the input of other commands.
When in read/reset status, the flash memory can read data during normal read access. As with
mask ROM, the flash memory supports program access from the CPU. Normal data read does
not require this Read/Reset command. This command is mainly used to initialize the automatic
algorithm in such cases as when a command does not terminate normally for some reason.
CHAPTER 21 FLASH MEMORY
433
Advertisement
Table of Contents
