Smart Media Card Experiments The performance of the smart media card is quite close to the spec’s...
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Transcript of Smart Media Card Experiments The performance of the smart media card is quite close to the spec’s...
Smart Media Card Experiments
• The performance of the smart media card is quite close to the spec’s definition.
• However, the program overhead and driver’s limit will downgrade the performance
Measure Spec
Total OriginalCode
Overhead Remove
Total Spec
Erase 2s 2ms 2s 2ms
Write 8s 323us 250us 6.5s 200us
Read 2s 72us 47us 1.2s 38us
528-Byte Page Read Operation- Random Access : 12µs(Max.)- Serial Page Access : 50ns(Min.)
Fast Write Cycle Time- Program Time : 200µs(Typ.)- Block Erase Time : 2ms(Typ.)
For 1024 blocks, that is 16 MB.
Transfer Type MaximumTransfer Size
Control Endpoint 0 4KB
Control (Other Endpoints)
64KB
FDBench - Disk Benchmark(Unit: KB/s) Read Write Random Read Random Write
ATA Hard Disk 43967 37222 13427 18830
SATA Hard Disk
46800 49254 10112 27765
Genesys 15712 7691 15715 1960
Sandisk 16491 8048 15952 2514
Transcend 14528 11415 14275 2030
NTFS – Random Write
NTFS Observations
• The metadata files will always allocated at the same LBA, and there are some frequently modified data such as $MFT, $LOG.
• When performing random write operations, NTFS will read before writing
• Design a SSD maintain policy for NTFS to overcome the side effects on flash memory.