ES25P80 Datasheet, PDF (25/35 Pages) Excel Semiconductor Inc. – 8Mbit CMOS 3.0 Volt Flash Memory with 75Mhz SPI Bus Interface

ADVANCED INFORMATION
EE SS II
Excel Semiconductor inc.
Program Parameter Page (PPP)
The Program Parameter Page instruction allows up
to 256 bytes to be programmed at memory word
locations that have been previously erased to all 1s
“FFFFh” A Write Enable(WREN) instruction must
be executed before the device will accept the Pro-
gram Parameter Page instruction(Status Register
bit WEL must equal 1). The instruction is initiated
by driving the CS# pin low then shifting the instruc-
tion code “52h” followed by a 24-bit address(A23-
A0) and at least one bytes, into the SI pin. Only the
lower 8 address bits (A7-A0) are used, the 16 upper
most address bit (A23-A8) are ignored. The CS#
pin must be held low for the entire length of the
instruction while data is being sent to the device.
The Program Parameter Page instruction sequence
is shown in Figure 21.
Less than 256 bytes can be programmed without
having any effect on other data within the page. If
more than 256 bytes are sent to the device the
addressing will wrap to the beginning of the page. If
previously written data bytes are over-written the
data will not be valid.
In most application it is best to read the full 256-byte
contents of the page into a temporary RAM. Data
can then be modified as needed and the entire 256
bytes can then be reprogrammed into the Parameter
Page at one time.
As with the write and erase instruction, the CS#
must be driven high after the eighth bit of the last
byte has been latched. If this is not doen the Param-
eter Page Program instruction will not be executed.
After CS# is driven high, the self timed Page Pro-
gram instruction will commence for a time duration of
t_PP, as specified in Table 8. While The Page Program
cycle is in progress, the Read Status Register
instruction may still be accessed for checking the
status of the WIP bit. The WIP bit is a 1 during the
program cycle and becomes a 0 when the cycle is
finished and the device is ready to accept other
instruction again. After the program cycle has
started the Write Enable Latch(WEL) bit in the Status
Register is cleared to 0. The Program Parameter
Page instruction will not be excecuted if the
addressed page is protected by the Block Pro-
tect(BP2, BP1, BP0) bits
CS#
SCK
SI
0 1 2 3 4 5 6 7 8 9 10
28 29 30 31 32 33 34 35 36 37 38 39
Instruction
24-Bit Address
Data Byte1
0 1 0 1 0 01
0 _{23 22 21}
MSB
21 07 654 321 0
MSB
CS#
SCK
40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55
Data Byte 2
Data Byte 3
Data Byte256
SI
7 654 321 07 654 321 ⁰
7 654 321 0
MSB
MSB
MSB
Figure 21. Program Parameter Page (PPP) Instruction Sequence
ES25P80
25
Rev. 0D May, 11, 2006