8A3xxxx 72QFN EVK User Manual
© 2019 Integrated Device Technology, Inc.
8
February 14, 2019
2.
Working with Timing Commander™ for Programing/Configuration
The following sections are best cross-referenced with the ClockMatrix GUI Step-by-Step User Guide which is available on
www.idt.com
.
2.1
Default Operation
The board can operate off an EEPROM that has stored all information including firmware and a default configuration data. A default operation
provides a sanity check on the board before running the board through the IDT Timing Commander. Please set the board in the following default
conditions (see Figure 4 for jumper and switch positions).
Set all the GPIOs to the center position. This will ensure that GPIO9 is high and that the serial port is configured for I2C 1-byte
addressing.
VDDA = 3.3V, VDD_ FOD = 1.8V, and VDDO_Qx = 3.3V
Crystal frequency = 50MHz
CLK0 = 25MHz
FTDI, CM device, and EEPROM share the same I
2
C bus by jumping Pin 1 and 2 of JP12 and JP13
With the above default conditions ready, connect the board to the PC using a USB type A to USB mini cable, and power up the board using a
5V supply. On power-up, the ClockMatrix chip will read its firmware and configuration data from EEPROM and update all registers.
When this process is completed, the following frequencies are available:
Q0 = 122.88MHz
Q1 = 122.88MHz
Figure 4. Board Setting for Default Operation
Important Equipment Warning
:
In order to set GPIO9 to “High”, the switch for GPIO9 must be set either to the “+”
(high) position or the center position.
!
