M1AFS250-FGG256I Actel Corporation, M1AFS250-FGG256I Datasheet - Page 61

• Manufacturer Part Number: M1AFS250-FGG256I
• Description: Actel Fusion Family Of Mixed Signal Fpgas
• Manufacturer: Actel Corporation

Figure 2-34 • Flash Memory Block Organization
Table 2-20 • FB Address Bit Allocation ADDR[17:0]
Block
17
Block Organization
0
Sector
140
Flash Memory Block Addressing
Figure 2-34
Each FB is partitioned into sectors, pages, blocks, and bytes. There are 64 sectors in an FB, and each
sector contains 32 pages and 1 spare page. Each page contains 8 data blocks and 1 auxiliary block.
Each data block contains 16 bytes of user data, and the auxiliary block contains 4 bytes of user data.
Addressing for the FB is shown in
When the spare page of a sector is addressed (SPAREPAGE active), ADDR[11:7] are ignored.
When the Auxiliary block is addressed (AUXBLOCK active), ADDR[6:2] are ignored.
Note: The spare page of sector 0 is unavailable for any user data. Writes to this page will return an error,
and reads will return all zeroes.
1
2
12
shows a graphical representation of the flash memory block.
3
1190
4
11
Page 0
Page 1
Page
5
Page 2
Table
Page 3
6
7
2-20.
7
R e v i s i o n 1
Page 31
Spare Page
6
Block
Actel Fusion Family of Mixed Signal FPGAs
Notes:
1 block = 128 bits
1 page = 8 blocks plus the AUX block
1 sector = 33 pages
1 Flash array = 64 sectors
4
3
Byte
0
2- 45