Hello,
14680 datasheet says that is Preliminary but I got the Pro Kit and I see the device is available on market DigiKey, Mouser.
Is 14680 still under preliminary development ?
I look at SPI & QSPI info planning to attach an SD card. What would be the limitations in terms of uSD Card support, speed, reliability ?
From docs I noted 'SPI interface implements a subset of SPI' and on QSPI 'Single mode only allows Mode 0 and 3...'
Could I implement uSD Card via SPI or QSPI with a reliable quality ? What would be the transfer speed you would appreciate ?
一些特殊的事情to consider in this case ?
Thank you
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Hi tektronic,
Yes the 680 is available, and not under preliminary development.
Regarding your questions for interfacing an uSD card there is no software implementation for interfacing with an SD card or any attempt to do so, and as far as i can tell only the SPI interface is available since the QSPI interface can be used only for the QSPI flash memory of the 68x family, also besides that, the 680 doesn't expose the QSPI pins. So your are limited only to the SPI interface. Regarding the speed transfer i suppose that its depended on the clock available on the SPI interface which is up to 8MHz clock.
Thanks MT_dialog
Hello MT,
Cap. 12 Quad SPI Controller, starts with:
'The Quad SPI Controller (QSPIC) provides a low pin count interface to FLASH memory devices.'
Page 64 says more about pinout names.
So, I thought there is an QSPI available and I can attach Flash devices, but that is actually
only internally connected and you can only see it if you look 'more deeply on the graphics diagram block'
For me that is/was misleading.
For SPI, ds says: 'Clock speeds upto 16 MHz for the SPI controller.' Can you please ask engineering against 8MHz ?
Thank you.
.
Hi tektronic,
The datasheet mentions the internal clock of the SPI module, that is what can be clocked with 16MHz, the actual frequency that the SPI module can provide as a clock to a slave device is about 8MHz maximum since the available dividers are 2, 4, 8 and 14 of the main clock of 16MHz.
Thanks MT_dialog