MWLyon
 
 
 

Design Work Completed

>Prototyping
 
>Schematic Capture
 
>PCB Layout
 
>Assembly Language Programming (8051)
 
>Firmware Programming
 
>Initial Fabrication

1997
Sync-Locked Timebase
 
LOXALL Board top side
 

------------------------------------------------------------------------------
This information is provided for the sake of the customers who are still running this device in their equipment. This device predates the LOX2000 PCB sync-lock device.
------------------------------------------------------------------------------

-----------------------------------------------------------------------------

LOXALL SPECIFICATIONS

SYNC-LOCK RANGE - 12 FPS to 60 FPS

CLOCK OUTPUT RANGE - 5 MHz to 28 MHz

REFRESH RATE DOUBLER– Strap Selectable

SMALL SIZE – 2.2" X 2.0"

POWER - +5V @ 155Ma

------------------------------------------------------------------------------

The LOXALL PCB is a video sync-lock modification for use with computer graphics boards.

Using this device allows computer video to be sync-locked to an external sync generator for

use in a film or video production environment.

In a more general sense, any device which uses a 5 MHz to 28 MHz clock to output a stable

pulse in the range of 12 FPS to 60 FPS can be made to sync-lock using LOXALL.

SYNC-LOCK RANGE - 15 FPS to 30 FPS(12 FPS to 60 FPS)

------------------------------------------------------------------------------

Any video sync Frame Rate from 15 FPS to 30 FPS may be used as sync-lock input providing

the vertical countdown of the video card results in a viewable picture on the monitor.

Using .285V Black with the LM1881:

Bottom Limit: 15 Frames Per Second(36 Fields Per Second)

Top Limit: 30 Frames Per Second(60 Fields Per Second)

Using 4V Sync with the LM1881:

Bottom Limit: 12 Frames Per Second(24 Fields Per Second)

Top Limit: 60 Frames Per Second(120 Fields Per Second)

CLOCK OUTPUT RANGE - 5 MHz to 28 MHz

------------------------------------------------------------------------------

Any clock frequency from 5 MHz to 28 MHz may be produced.

REFRESH RATE DOUBLER – Strap Selectable

------------------------------------------------------------------------------

LOXALL has a X2 Refresh Rate Doubler strap which allows the video card vertical refresh rate

to be set to run twice the speed of sync-lock video vertical rate. For example:

Sync-lock video rate Video card refresh rate

(Interlaced) (Progressive)

Doubler Off - 24 Frames Per Second(48 Fields Per Second) 48 Frames Per Second

Doubler On - 24 Frames Per Second(48 Fields Per Second) 96 Frames Per Second

The ‘Doubler On/Doubler Off’ selection is loaded at power-up by checking the strap position.

 
LOXALL PCB top side
 
LOXALL PCB bottom side