參數(shù)資料
型號： LH28F040SUTD-Z4
廠商： Sharp Corporation
英文描述： 4M (512K 】 8) Flash Memory
中文描述： 4分（為512k】8）閃存
文件頁數(shù)： 9/32頁
文件大小： 247K
代理商： LH28F040SUTD-Z4
4M (512K × 8) Flash Memory
LH28F040SUTD-Z4
9
4M DUAL WORK FLASH MEMORY
SOFTWARE ALGORITHMS
Overview
With the advanced Command User Interface, its Per-
formance Enhancement commands and Status Regis-
ters, the software code required to perform a given
operation may become more intensive but it will result
in much higher write/erase performance compared with
current flash memory architectures.
The software flowcharts describing how a given
operation proceeds are shown here. Figures 4 through
6 depict flowcharts using the 2nd generation flash
device in the LH28F008SA-compatible mode. Figures
7 through 12 depict flowcharts using the 2nd genera-
tion flash device’s performance enhancement com-
mands mode.
When the device power-up or reset is completed, Set
Write Protect command must be written to both the bank
selected by BE
0
and BE
1
in order to reflect actual block
lock status.
When the device power-up or reset is completed, all
blocks come up locked. Therefore, Byte Write, Two Byte
Serial Write and Block Erase can not be performed in
each block. However, at that time, Erase All Unlocked
Block is performed normally, if used, and reflect actual
lock status, also the unlocked block data is erased. When
the device power-up or reset is completed, Set Write
Protect command must be written to reflect actual block
lock status.
Reset Write Protect command must be written be-
fore Write Block Lock command. To reflect actual block
lock status, Set Write Protect command is succeeded.
The Compatible Status Register (CSR) used to
determine which blocks are locked. In order to see Lock
Status of certain block, a Byte Write command (WA =
Block Address, WD = FHH) is written to the CUI, after
issuing Set Write Protect command. If CSR.7, CSR.5
and CSR.4 (WSMS, ES and DWS) are set to ‘1’s, the
block is locked. If CSR.7 is set to ‘1’, the block is not
locked.
Reset Write Protect command enables Write/Erase
operation to each block.
In the case of Block Erase is performed, the block
lock information is also erased. Block Lock command
and Set Write Protect command must be written to pro-
hibit Write/Erase operation to each block.
There are unassigned commands. It is not recom-
mended that the customer use any command other than
the valid commands specified in “Command Bus Defi-
nitions”. Sharp reserved the right to redefine these codes
for future functions.
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