afs600 Actel Corporation, afs600 Datasheet - Page 53

• Manufacturer Part Number: afs600
• Description: Actel Fusion Programmable System Chips Mixed-signal Family With Optional Arm Support
• Manufacturer: Actel Corporation

All flash memory block input signals are active high, except for RESET.
Flash Memory Block Diagram
A simplified diagram of the flash memory block is shown in
Figure 2-32 • Flash Memory Block Diagram
The logic consists of the following sub-blocks:
• Flash Array
• Page Buffer
• Block Buffer
• ECC Logic
OVERWRITEPROTECT
PAGELOSSPROTECT
UNPROTECTPAGE
OVERWRITEPAGE
DATAWIDTH[1:0]
Contains all stored data. The flash array contains 64 sectors, and each sector contains 33 pages of data.
A page-wide volatile register. A page contains 8 blocks of data and an AUX block.
Contains the contents of the last block accessed. A block contains 128 data bits.
The FB stores error correction information with each block to perform single-bit error correction and double-bit
error detection on all data blocks.
LOCKREQUEST
DISCARDPAGE
ADDDR[17:0]
PAGESTATUS
STATUS[1:0]
ERASEPAGE
SPAREPAGE
AUXBLOCK
READNEXT
PROGRAM
WD[31 :0]
RD[31:0]
RESET
BUSY
WEN
REN
PIPE
CLK
Output
MUX
Control
Logic
Block Buffer
(128 bits)
A d v an c ed v1 . 4
Figure
Logic
ECC
2-32.
Page Buffer = 8 Blocks
Plus AUX Block
Actel Fusion Programmable System Chips
Flash Array = 64 Sectors
2-39