參數(shù)資料
型號: NAND128W4A3AN6E
廠商: STMICROELECTRONICS
元件分類: PROM
英文描述: 8M X 16 FLASH 3V PROM, 10000 ns, PDSO48
封裝: 12 X 20 MM, LEAD FREE, PLASTIC, TSOP-48
文件頁數(shù): 13/56頁
文件大小: 882K
代理商: NAND128W4A3AN6E
NAND128-A, NAND256-A, NAND512-A, NAND01G-A
20/56
DEVICE OPERATIONS
Pointer Operations
As the NAND Flash memories contain two differ-
ent areas for x16 devices and three different areas
for x8 devices (see Figure 11.) the read command
codes (00h, 01h, 50h) are used to act as pointers
to the different areas of the memory array (they se-
lect the most significant column address).
The Read A and Read B commands act as point-
ers to the main memory area. Their use depends
on the bus width of the device.
In x16 devices the Read A command (00h)
sets the pointer to Area A (the whole of the
main area) that is Words 0 to 255.
In x8 devices the Read A command (00h) sets
the pointer to Area A (the first half of the main
area) that is Bytes 0 to 255, and the Read B
command (01h) sets the pointer to Area B (the
second half of the main area) that is Bytes 256
to 511.
In both the x8 and x16 devices the Read C com-
mand (50h), acts as a pointer to Area C (the spare
memory area) that is Bytes 512 to 527 or Words
256 to 263.
Once the Read A and Read C commands have
been issued the pointer remains in the respective
areas until another pointer code is issued. Howev-
er, the Read B command is effective for only one
operation, once an operation has been executed
in Area B the pointer returns automatically to Area
A.
The pointer operations can also be used before a
program operation, that is the appropriate code
(00h, 01h or 50h) can be issued before the pro-
gram command 80h is issued (see Figure 12.).
Figure 11. Pointer Operations
Figure 12. Pointer Operations for Programming
AI07592
Area A
(00h)
A
Area B
(01h)
Area C
(50h)
Bytes 0- 255
Bytes 256-511
Bytes 512
-527
C
B
Pointer
(00h,01h,50h)
Page Buffer
Area A
(00h)
A
Area C
(50h)
Words 0- 255
Words 256
-263
C
Pointer
(00h,50h)
Page Buffer
x8 Devices
x16 Devices
ai07591
I/O
Address
Inputs
Data Input
10h
80h
Areas A, B, C can be programmed depending on how much data is input. Subsequent 00h commands can be omitted.
AREA A
00h
Address
Inputs
Data Input
10h
80h
00h
I/O
Address
Inputs
Data Input
10h
80h
Areas B, C can be programmed depending on how much data is input. The 01h command must be re-issued before each program.
AREA B
01h
Address
Inputs
Data Input
10h
80h
01h
I/O
Address
Inputs
Data Input
10h
80h
Only Areas C can be programmed. Subsequent 50h commands can be omitted.
AREA C
50h
Address
Inputs
Data Input
10h
80h
50h
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