Actel Fusion Mixed-Signal FPGAs
Embedded Memories
Fusion devices include four types of embedded memory: flash block, FlashROM, SRAM, and FIFO.
Flash Memory Block
Fusion is the first FPGA that offers a flash memory block (FB). Each FB block stores 2 Mbits of data.
The flash memory block macro is illustrated in Figure 2-31. The port pin name and descriptions are
detailed on Table 2-19 on page 2-42. All flash memory block signals are active high, except for CLK
and active low RESET. All flash memory operations are synchronous to the rising edge of CLK.
ADDR[17:0]
WD[31:0]
RD[31:0]
BUSY
STATUS[1:0]
DATAWIDTH[1:0]
REN
READNEXT
PAGESTATUS
WEN
ERASEPAGE
PROGRAM
SPAREPAGE
AUXBLOCK
UNPROTECTPAGE
OVERWRITEPAGE
DISCARDPAGE
OVERWRITEPROTECT
PAGELOSSPROTECT
PIPE
LOCKREQUEST
CLK
RESET
Figure 2-31 • Flash Memory Block
Preliminary v1.7
2-41
ACTEL [ Actel Corporation ]
