M36DR232 datasheet(21/46 Pages) STMICROELECTRONICS

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M36D232A, M36DR232B

Table 21. Device Geometry Definition

Offset Word

Mode

Data

Description

27h

0016h

Device Size = 2n in number of bytes

28h

0001h

Flash Device Interface Code description: Asynchronous x16

29h

0000h

2Ah

0000h

Maximum number of bytes in multi-byte program or page = 2n

2Bh

0000h

2Ch

0002h

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."

2. x specifies the number of regions within the device containing one or more con-

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 considered

to have 5 Erase Block Regions.

Even though two regions both contain 16KB

blocks, the fact that they are not contiguous means they are separate Erase

Block Regions.

3. By definition, symmetrically block devices have only one blocking region.

M36DR232A

Erase Block Region Information

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.

y = D15-D0 = FFFFh => y+1 = 64K blocks [maximum number]

y = 0 means no blocking (# blocks = y+1 = "1 block")

Note: y = 0 value must be used with number of block regions of one as indicated

by (x) = 0

2Dh

003Eh

2Eh

0000h

2Fh

0000h

30h

0001h

31h

0007h

32h

0000h

33h

0020h

34h

0000h

M36DR232B

2Dh

0007h

2Eh

0000h

2Fh

0020h

30h

0000h

31h

003Eh

32h

0000h

33h

0000h

34h

0001h

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