A 5.62 Ω tuning resistor is
connected to the HHSRTUNE pin.
Refer to the “Typical Connection”
section in the USB Host High Speed Port (UHPHS)
chapter of the SAMA7D6 Series data sheet.
The TST pin is grounded.
If the design does not need a JTAG
boundary scan, tie the JTAGSEL pin to GND or leave it floating.
A tuning resistor is connected to the
QSPI0_CAL and SDMMCx_CAL pins of each interface. Use a 20 kΩ resistor for 1.8V
QSPI/SDMMC memories or a 16.9 kΩ resistor for 3.3V memories. If the memory device
operates in both 1.8V and 3.3V modes, use a 20 kΩ resistor.
A 4.02 kΩ tuning resistor is connected
to the MIPI_REXT pin.
All resistors connected to calibration
inputs should have a tolerance of ±1% or better.
A 32.768 kHz crystal oscillator is
placed between XIN32 and XOUT32.
Refer to the “32.768 kHz Crystal
Oscillator” section in the Electrical Characteristics chapter of the SAMA7D6 Series data sheet.
A high-frequency clock source is
provided either through a crystal oscillator placed between XIN and XOUT or through an
external clock generator.
Refer to the “Main Crystal
Oscillator” section in the Electrical Characteristics chapter of the SAMA7D6 Series data sheet if a crystal oscillator is
used as the main clock source.
If the clock generator option is chosen,
it is recommended to ground XOUT to improve stability.
Clock sources should be chosen with
great care. In the Electrical Characteristics chapter of the SAMA7D6 Series data sheet:
Refer to the “Crystal Oscillator
Design Considerations” section for a list of useful parameters when choosing
crystal oscillators.
Refer to the formulas in the
"32.768 kHz Crystal Oscillator" section and the "Main Crystal Oscillator" section
to calculate the values of the external load capacitors for the crystal
oscillators.
The online versions of the documents are provided as a courtesy. Verify all content and data in the device’s PDF documentation found on the device product page.
