GD25LQ40XIGX Datasheet, PDF (30/59 Pages) ELM Technology Corporation – 1.8V Uniform Sector Dual and Quad Serial Flash

GD25LQ40xIGx 1.8V Uniform Sector Dual and Quad Serial Flash
7.16. Sector Erase (SE) (20H)
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The Sector Erase (SE) command is for erasing the all data of the chosen sector. A Write Enable (WREN)
command must previously have been executed to set the Write Enable Latch (WEL) bit. The Sector Erase (SE)
command is entered by driving CS# low, followed by the command code, and 3-byte address on SI. Any address
inside the sector is a valid address for the Sector Erase (SE) command. CS# must be driven low for the entire
duration of the sequence.
The Sector Erase command sequence: CS# goes low → sending Sector Erase command → 3-byte address on
SI → CS# goes high. The command sequence is shown in Figure17. CS# must be driven high after the eighth bit
of the last address byte has been latched in; otherwise the Sector Erase (SE) command is not executed. As soon
as CS# is driven high, the self-timed Sector Erase cycle (whose duration is tSE) is initiated. While the Sector
Erase cycle is in progress, the Status Register may be read to check the value of the Write In Progress (WIP) bit.
The Write In Progress (WIP) bit is 1 during the self-timed Sector Erase cycle, and is 0 when it is completed. At
some unspecified time before the cycle is completed, the Write Enable Latch (WEL) bit is reset. A Sector Erase
(SE) command applied to a sector which is protected by the Block Protect (BP4, BP3, BP2, BP1 and BP0) bit (see
Table1 & Table1a) is not executed.
Figure 17. Sector Erase Sequence Diagram
CS#
SCLK
0123456789
29 30 31
SI
Command
24 Bits Address
20H
23 22
210
MSB
Figure 17a. Sector Erase Sequence Diagram (QPI)
CS#
SCLK
IO₀
IO₁
IO₂
IO₃
012345 67
Command
20H _{A23-16 A12-8}
20 16 12 8
A7-0
40
21 17 13 9 5 1
22 18 14 10 6 2
23 19 15 11 7 3
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