M28W320 STMicroelectronics, M28W320 Datasheet - Page 18

• Manufacturer Part Number: M28W320
• Description: 32 Mbit 2Mb x16/ Boot Block Low Voltage Flash Memory
• Manufacturer: STMicroelectronics

M28W320CT, M28W320CB
Table 17. Device Geometry Definition
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M28W320CB M28W320CB
M28W320CT
Offset Word
Mode
2Ch
2Dh
2Dh
27h
28h
29h
2Ah
2Bh
2Eh
2Fh
30h
31h
32h
33h
34h
2Eh
2Fh
30h
31h
32h
33h
34h
M28W320CT Erase Block Region Information
001Eh
001Eh
0016h
0001h
0000h
0000h
0000h
0002h
0000h
0000h
0001h
0007h
0000h
0020h
0000h
0007h
0000h
0020h
0000h
0000h
0000h
0001h
Data
Device Size = 2
Flash Device Interface Code description: Asynchronous x16
Maximum number of bytes in multi-byte program or page = 2
Number of Erase Block Regions within device
bit 7 to 0 = x = number of Erase Block Regions
Note:1. x = 0 means no erase blocking, i.e. the device erases at once in ”bulk.”
bit 31 to 16 = z, where the Erase Block(s) within this Region are (z) times 256 bytes in
size. The value z = 0 is used for 128 byte block size.
e.g. for 64KB block size, z = 0100h = 256 => 256 * 256 = 64K
bit 15 to 0 = y, where y+1 = Number of Erase Blocks of identical size within the Erase
Block Region:
e.g.
Note: y = 0 value must be used with number of block regions of one as indicated
2. x specifies the number of regions within the device containing one or more con-
3. By definition, symmetrically block devices have only one blocking region.
y = D15-D0 = FFFFh => y+1 = 64K blocks [maximum number]
y = 0 means no blocking (# blocks = y+1 = ”1 block”)
by (x) = 0
tiguous Erase Blocks of the same size. For example, a 128KB device (1Mb)
having blocking of 16KB, 8KB, four 2KB, two 16KB, and one 64KB is consid-
ered to have 5 Erase Block Regions.
16KB blocks, the fact that they are not contiguous means they are separate
Erase Block Regions.
n
in number of bytes
Description
Even though two regions both contain
n