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USB to SD throughput with EZ-PD FX3S, EZ-PD SD3, or EZ-PD SD2 – KBA233245

USB to SD throughput with EZ-PD FX3S, EZ-PD SD3, or EZ-PD SD2 – KBA233245

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Community Translation: EZ-PD FX3S、EZ-PD SD3、またはEZ-PD SD2を用いたUSBからSDへのスループット – KBA233245

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Question: What is the throughput of USB to SD card that can be achieved using EZ-PD™ FX3S, EZ-PD SD3, or EZ-PD SD2? 

Answer: For each storage port, the theoretical data rate can be calculated as follows:

Data rate (MBps): SD_CLK frequency * data bus width/8

The maximum throughput is achieved under the following conditions:

1.

Device used for testing

FX3S

2.

SD card

SanDisk SD1N5C4 eMMC 4.41

3.

SD bus width

8 bits

4.

MMC Clock Frequency

52 MHz (DDR mode)

4.

Driver

Windows Mass Storage Device


USB – SD Performance

USB Speed

Read (MBps)

Write (MBps)

USB 3.0

44.5

49.6

USB 2.0

30.2

24.1

The standard Windows Mass Storage driver uses very small bursts (64 KB) for mass storage data transfers, and the performance obtained is limited by various protocol overheads.

For the performance of EZ-PD FX3S with RAID 1 firmware, see section 8 of AN89661.

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