Table 1 Comparison between NOR and NAND Flash memories[55–57]
Features | NOR | NAND |
---|---|---|
Memory size | ≤512 Mbit | 1 to 8 Gbit |
Sector size | Approximately 1 Mbit | Approximately 1 Mbit |
Program time | 9 μs/word | 400 μs/page |
Erase time | 1 s/sector | 1 ms/sector |
Read access time | <80 ns | 20 μs |
Write parallelism | 8 to 16 words | 2 Kbyte |
Output parallelism | Byte/word/dword | Byte/word |
Read parallelism | 8 to 16 words | 2 Kbyte |
Access method | Random | Sequential |
Price | High | Very low |
Reliability | Standard | Low |