Copyright By PowCoder代写 加微信 powcoder
Power SRAM
Read Access Write Access Cost/MByte Data Retention
Current/GByte
8.3ms 8.3ms $1.00 0A
60ns 60ns $35.00 1A
85ns 85ns $120 2mA
4 − 10 microsec. $30.00
Main Memory
8 to 32 bits
Memory Bus
32 or 64 bits
eN Subsystem
Table Flash
Original state
Original copy
Table Flash
Copy page from Flash to SRAM
Table Flash
Write data
Make update to new copy in SRAM
Table Flash
Updated page table pointer
Update page table and invalidate old copy
Invalid copy
Received write to page 1
Blk15 Blk15 Blk15 Blk15
… . … . … .
Segment 15
Segment 2 Segment 1 Segment 0
One Flash Chip
Blk 2 Blk 1 Blk 0
Blk 2 Blk 1 Blk 0
Blk 2 Blk 1 Blk 0
Blk 2 Blk 1 Blk 0
Chip Chip Chip
1 Bank of Flash Memory
Valid Data(Read Only)
Erased Segment
Valid Data(Read Only)
Valid Data(Read/Write)
Invalidated copy (not writable)
Locate a fresh segment
Copy valid data to the new segment
Update pointers to the new copy
Unused page (writable)
Active page
0.7 0.8 0.9 1
Flash Array Utilization
程序代写 CS代考 加微信: powcoder QQ: 1823890830 Email: powcoder@163.com