M88 Evaluation Kit User Guide
Add-on boards
STO-DEV7227-HB Rev. 2.1
20
11
Add-on boards
11.1
Oscillator board
Silicon Labs
provides optional oscillator board carrying a high-quality oscillator. To select the oscillator
on the add-on board as reference source, move jumper P307 to pin 5-6. On the add-on board, allow for
voltage control of the oscillator by moving the jumper P102 on the add-on board to pin 2-3.
Figure 11. Oscillator add-on board
If voltage control is used, DCO control needs to be turned off for DSPLL A and the voltage control range
needs to be set for the mounted oscillator. This is done using the command
ptp2 config -c 000 -v
<value>
before the PTP engine is started.
Oscillator
Voltage control range
Vectron CA4400A1
1000
Table 17. Oscillator voltage control range
11.1
GNSS board
Silicon Labs
provides an optional GNSS board for satellite-based reference time. The board comes
with an antenna connector cable.
Figure
12
. GNSS add-on board
Plug the GNSS board into connector P504 and a patch antenna to the antenna connector cable. Make
sure the antenna has a clear view of the sky.
