eMMc JEDEC version 5.1

Question

Hi All, 
 We are Using: 
 
 Platform: 
 Version: 2022-04 (22.4.0) Build Id: R20220331-2313 
 SSP: v2.3.0 
 S7DK 
 Problem: 
 We want to use 16GB eMMC all of which use a JEDEC v5.0/5.1. 
 when we use such a chip in our system it does not work. 
 We are using SSP 2.3.0 
 Any Clues? 
 Regards, 
 Surojit

Sergey (SWF) · Answer

Hello Surojit, 
 Are you using this eMMC as the extension of the flash memory? 
 S7G2 is the 32-bit MCU, so the maximum addressable space is limited with 4 GB, maybe that's the reason. 
 Kind regards, 
 Sergey 
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Sergey (SWF) · Answer

Hello Surojit, 
 According to the S7G2 Hardware User's Manual, "The MMC interface supports 1-bit, 4-bit, and 8-bit MMC buses that provide eMMC 4.51 (JEDEC Standard JESD 84-B451) device access. This interface also provides backward compatibility and supports for high-speed SDR transfer modes." ( https://www.renesas.com/us/en/document/man/s7g2-microcontroller-group-users-manual?r=1054631#G47.2512524 ) 
 So probably, it just doesn't support the later JEDEC version. 
 Kind regards, 
 Sergey 
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