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RC32012A Evaluation Kit Manual
1.5
I2C between FTDI, ClockMatrix Device, and On-board EEPROM
One of the major differences between the QFN-72 ClockMatrix device and its BGA-144 counterpart is that there is
only one serial bus on the QFN-72 device. The I2C bus between the FTDI chip and ClockMatrix device is the
same bus between the ClockMatrix device and the on-board EEPROM. The on-board EEPROM is used to store
device firmware and/or customer's configuration data. JP12 and JP13 must be jumped between Pin 1 and 2 to
enable the I2C connections.
Jumper position
I2C Path
2.
Working with Timing Commander for Programing/Configuration
The following sections are best cross-referenced with the
available on the
ClockMatrix Timing Solutions
2.1
Default Operation
The evaluation board can be operated off EEPROM, which 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. Please set the board to the following default conditions (for jumper and
switch positions, see
Figure
▪ 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_GPIO_FOD = 1.8V, VDD0_Qx = 3.3V
▪ Crystal frequency 50MHz
▪ CLK0 = 25MHz
▪ FTDI, ClockMatrix 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 evaluation 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 single +5V supply. On power-up, the
ClockMatrix device will read its firmware and configuration data from EEPROM and update all the registers. When
this process completes, the following frequencies are available:
▪ Q0 = 122.88MHz
▪ Q1 = 122.88MHz
R31UH0010EU0102 Rev.1.02
Apr 20, 2022
Table 2. EEPROM I2C Connections
FDTI and CM chip;
CM chip and EEPROM
page and various ClockMatrix device product pages.
5):
JP12/JP13
Pin 1 and 2
ClockMatrix GUI Step-by-Step User Guide
JP12/JP13
Pin 2 and 3
N/A
that is
Page 6
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