How can I get 'sync' signals for sine wave out? [FPGA USB 7856R]

Hello,
I'm Sean Ahn using NI 7856R, USB FPGA with LabVIEW 2014.
I'm trying to make 'sync' signals for sine wave of adjustable frequency, like general function generator's sync out.
I use sine waves whose frequency is feedback-congtrolled between 25~30 kHz and need sync signals of square wave.
Like [1] below, when I try resettng two wavefom-generators, sine and sync signals are not perfectly synchronized.
And everytime I adjust sine's frequency, the phase difference between sine and sync changes arbitrarily
In case of [2] using 'zero-crossing detector', I have severe jitter of sync signals not suitable as 'sync' signals for other parts.
Please, give me some help.
Thanks in advance
Sean Ahn
[1] Reseting two waveform generators
[2] Zero-crossing detect

Here’s my issue. When I try to move any data between my PC and the iPad2 I receive an error message that states that “the [sync] session could not be started with the ipad, Please disconnect and reconnect the iPad and try again”
I have tried again and again by various methods etc . and all I get is the same message when I attempt to sync, backup or update the iPad.
I have tried the following AND FAILED:
Deselect all Apps, Music etc in iTunes, then attempt to sync
Disable and enable the iPad in device manager and restart itunes and try to sync again
Disable and enable Apple Mobile Device Services and sync/backup/update
Run iTunes as Administrator
Reboot all devices (iPad buy pressing two buttons at once)
Turn off all security and reboot and sync
Connect directly to internet without a router
Tried to sync with all wireless turned off and in airplane mode
Running iTunes Diagnostics...... nothing all test passes
Changing USB ports and cables
Removing my SIM card and rebooting and trying to syc
Trying to sync via wifi only
Turning off all icloud services
Uninstalling all Apple Software and reinstalling again
I am syncing to a 64bit PC running Win 7 Premium with all the latest updates, all firewalls off. WiFi and direct connect ethernet to Internet service with and without router.
I am trying to Sync an iPAD 2 running iOS version 5.1.1 (9B206)
I am trying to update from iOS 5.11 to 6.01 by using Itunes 11.0.0.16.3 in a USB or directly through the iPad via wifi.
Please help as everything I have tried has failed.

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How can I get 'sync' signals for sine wave out? [FPGA USB 7856R]

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