SA25F010 Saifun, SA25F010 Datasheet - Page 27

• Manufacturer Part Number: SA25F010
• Description: 1Mb Serial Flash
• Manufacturer: Saifun

Page Erase (PE)
The PE instruction sets all 256 bytes in the
selected page to 1. Before it can be
executed, two separate instructions must
be carried out. The device must first be
write enabled via the WREN instruction,
and then a PE sequence, which consists of
one opcode byte and three data bytes may
be executed. The address of the memory
locations to be written must be inside the
page to be erased and outside the
protected address field location selected by
the Block Write Protection level. During an
internal PE cycle, all commands are
ignored except the RDSR instruction.
A PE instruction requires the following
sequence:
1. After the CSb line is pulled low to
2. Erasing begins after the CSb pin is
SCK
select the device, the PE opcode is
transmitted via the SI line, followed
by the 3-byte address.
brought
low-to-high transition must occur
during
immediately after the clock in the
last address bit.
CS
SI
the
high.
SCK
The
0
Figure 18. Page Erase (PE) Instruction Sequence
1
low
CSb
2
Instruction
3
time,
pin's
4
5
6
7
MSB
23
8
As soon as CSb is driven high, the
self-timed PE cycle (whose duration is
defined as T
cycle is in progress, the status register may
be read to check the value of the /RDY bit.
The /RDY bit is 1 during the self-timed PE
cycle, and 0 when it is completed. The
WEN bit is reset at some unspecified time
before
instruction sequence is shown in Figure 18.
The SA25F010 is automatically returned to
the Write Disable state at the completion of
a PE cycle.
22
9
NOTES:
1. If the device is not write enabled,
2. A PE instruction applied to a page
24 Bit Address
21
10
the
instruction
standby state when CSb is brought
high. A new CSb falling edge is
required to re-initiate the serial
communication.
that is protected by the Block
Protect
described in Table 8, page 18, and
Table 9, page 21) is not executed.
the
28
3
device
PE
cycle
29
) is initiated. While the PE
2
(BP1,
SA25F010 Advanced Information
30
and
1
ignores
is
0
31
BP0)
returns
completed.
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bits
the
to
SAIFUN
the
(as
PE
The
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