1
Discussion - Hardware / FT4222H reset and Configuration
« on: September 03, 2019, 09:59:40 AM »
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)
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)