W25Q40BLSVIP datasheet(43/74 Pages) WINBOND

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W25Q40BL

Publication Release Date: May 04, 2012

- 43 -

Revision D

7.2.26 Chip Erase (C7h / 60h)

The Chip Erase instruction sets all memory within the device to the erased state of all 1s (FFh). A Write

Enable instruction must be executed before the device will accept the Chip Erase Instruction (Status

instruction code “C7h” or “60h”. The Chip Erase instruction sequence is shown in figure 24.

The /CS pin must be driven high after the eighth bit has been latched. If this is not done the Chip Erase

instruction will not be executed. After /CS is driven high, the self-timed Chip Erase instruction will

commence for a time duration of tCE (See AC Characteristics). While the Chip Erase cycle is in progress,

the Read Status Register instruction may still be accessed to check the status of the BUSY bit. The BUSY

bit is a 1 during the Chip Erase cycle and becomes a 0 when finished and the device is ready to accept

other instructions again. After the Chip Erase cycle has finished the Write Enable Latch (WEL) bit in the

Status Register is cleared to 0. The Chip Erase instruction will not be executed if any page is protected by

the Block Protect (CMP, SEC, TB, BP2, BP1, and BP0) bits (see Status Register Memory Protection

table).

Figure 24. Chip Erase Instruction Sequence Diagram

W25Q40BLSVIP 数据表(PDF) 43 Page - Winbond