REVISION 12/03/15
6
VERSACLOCK
®
6 - 5P49V69xx Family Programmer Board
VersaClock 6 Volatile Programming via I2C
The procedure below enables the user to calibrate the device to a proper VCO band that will guarantee functionality over the full
temperature range of the device. Certain conditions are required to properly calibrate the VCO.
1. Conditions: Ambient temperature 25°C, 3.3V. For any other conditions, contact IDT.
2. Procedure:
a. Power-up the device
b. Write all relevant bits to the device to program PLL, FOD and output types
c. Provide a reference clock to the IC corresponding to the configuration
written
in
point
b
.
d. Specific bits need to be set:
• Set VCO Monitoring in address x1D, bit[1] to “0”
• Set Test mode bit in register 0x11 (bit[5]) to “0”
e. Perform VCO Calibration:
f. Toggle bit[7] in 0x1C by writing the bit to 0 then 1 and then back to 0. Final state of the bit should be 0.
• Wait 100 ms
