sampathpb
Newbie level 2
mmc modes
Hi Friends,
My question is regarding the SD/SDIO/MMC Host Controller IP core features.
I know that the SD card and MMC cards (upto Ver4.2) support the SPI mode of operation, in addition to the primary protocol ., ie SD protocol and MMC protocol.
My understanding of the reason for providing support for SPI mode in the memory cards is that, they can be used in conjunction with the off-the-shelf microcontrollers, that do not currently have support for SD or MMC protocol.
By this, these cards be used in designs where the SD/MMC protocol is still not implemented, but has SPI readily available.
Now, I was refering to some of the IP vendors where the SD/SDIO/MMC host controller provides (in addition to 1-bit and 4-bit SD), the SPI mode of operation.
I donot understand why the host IP core should support the SPI mode ? Since the host IP already implements SD protocol , it will connect to the card through SD mode itself. And as I understand, there is no memory card, that implements only SPI without SD or MMC modes.
So, why in some Host IP core, they are mentioning that SPI mode as one of the modes of operation ?
thanks in advance,
best regards,
sampathpb
Hi Friends,
My question is regarding the SD/SDIO/MMC Host Controller IP core features.
I know that the SD card and MMC cards (upto Ver4.2) support the SPI mode of operation, in addition to the primary protocol ., ie SD protocol and MMC protocol.
My understanding of the reason for providing support for SPI mode in the memory cards is that, they can be used in conjunction with the off-the-shelf microcontrollers, that do not currently have support for SD or MMC protocol.
By this, these cards be used in designs where the SD/MMC protocol is still not implemented, but has SPI readily available.
Now, I was refering to some of the IP vendors where the SD/SDIO/MMC host controller provides (in addition to 1-bit and 4-bit SD), the SPI mode of operation.
I donot understand why the host IP core should support the SPI mode ? Since the host IP already implements SD protocol , it will connect to the card through SD mode itself. And as I understand, there is no memory card, that implements only SPI without SD or MMC modes.
So, why in some Host IP core, they are mentioning that SPI mode as one of the modes of operation ?
thanks in advance,
best regards,
sampathpb