General Category > Discussion - Hardware
FT4222H reset and Configuration
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JMLsystem:
I'm using the FT4222H on the motherboard of our product and i have some questions about it :
1) What is the minimum low time for the RESETN signal before VCCIO rising ?
2) Does the EEPROM chip need to programmed before using the FT4222H ?
Because when my Host access to the FT4222 through the USB port,
in QSPI Master mode (DCNF[1:0]=00 or 11)
i can see the SS0O chip select going low during 1.92µs,
but there are no SCLK clock pulse, no MISO/MOSI/IO[2:3] changes (there are stuck à 0V)
FTDI Community:
Hello,
You have contacted our support team via email with these questions.
The answer can be posted here once it's resolved to help other FTDI Community users.
Best Regards,
FTDI Community
JMLsystem:
Responses from FTDI technical Support :
1) "Does the EEPROM chip need to programmed before using the FT4222H ?
-> The OTP does not need to programmed before using the FT4222H.
Please evaluate using the UMFT4222EV : this module OTP is not pre-programmed.
2) "What is the minimum low time for the RESETN signal before VCCIO rising ?"
-> The minimum low time is about 5.2us
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