R31UH0015EU0101 Rev.1.01
Page 6
Apr 26, 2022
8A3xxxx 72QFN Evaluation Kit Manual
2. Working with Timing Commander™ for Programing /
Configuration
The following sections are best cross-referenced with the
ClockMatrix GUI Step-by-Step User Guide
that is
page and various ClockMatrix device product pages.
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
Timing Commander tool. Set the board in the following default conditions (for jumper and switch positions, see
):
▪ 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 I2C 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 cable (type A on the PC side
and mini-type on the board side), and power up the board using a 5V supply. On power-up, the
ClockMatrix device 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 5. Board Setting for Default Operation
Note
: In order to set GPIO9 to “High”, the switch for GPIO9 must be set either to the “+” (high) position or the
).
