NAND256W3A2BN6F NUMONYX, NAND256W3A2BN6F Datasheet - Page 23

• Manufacturer Part Number: NAND256W3A2BN6F
• Manufacturer: NUMONYX

Specifications of NAND256W3A2BN6F

• Cell Type: NAND
• Density: 256Mb
• Access Time (max): 12us
• Interface Type: Parallel
• Boot Type: Not Required
• Address Bus: 25b
• Operating Supply Voltage (typ): 3/3.3V
• Operating Temp Range: -40C to 85C
• Package Type: TSOP
• Sync/async: Asynchronous
• Operating Temperature Classification: Industrial
• Operating Supply Voltage (min): 2.7V
• Operating Supply Voltage (max): 3.6V
• Word Size: 8b
• Number Of Words: 32M
• Supply Current: 20mA
• Mounting: Surface Mount
• Pin Count: 48
• Lead Free Status / RoHS Status: Compliant

NAND128-A, NAND256-A
6
6.1
Device operations
Pointer operations
As the NAND flash memories contain two different areas for x16 devices and three different
areas for x8 devices (see
to the different areas of the memory array (they select the most significant column address).
The Read A and Read B commands act as pointers to the main memory area. Their use
depends on the bus width of the device.
In both the x8 and x16 devices the Read C command (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. However, 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 program command 80h is issued (see
Figure 9: Pointer operations for
Figure 8.
Bytes 0- 255
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.
Area A
(00h)
A
Pointer operations
(00h,01h,50h)
x8 Devices
Bytes 256-511 Bytes 512
Pointer
Area B
(01h)
B
Figure
Area C
(50h)
-527
C
programming).
8) the read command codes (00h, 01h, 50h) act as pointers
Page Buffer
Words 0- 255
x16 Devices
Area A
(00h)
A
(00h,50h)
Pointer
Device operations
Words 256
Area C
(50h)
-263
C
Page Buffer
AI07592
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