saa5355 NXP Semiconductors, saa5355 Datasheet - Page 28

• Manufacturer Part Number: saa5355
• Description: Single-chip Colour Crt Controller Ftfrom
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Synchronization
Stand-alone mode
As a stand-alone device (e.g. in terminal applications) FTFROM can output a composite sync signal (TCS) to the display
timebase IC or to a monitor. Timing is obtained from a 6,041957 MHz on-chip oscillator using an external crystal as
shown in Fig.24.
Simple-slave
In the simple-slave mode FTFROM synchronizes directly to another device as shown in Fig.25. FTFROM’s horizontal
counter is reset by the falling edge of TCS. A dead time of 250 ns is built in to avoid resetting the counter at every tv line
and so prevents screen jitter.
Field synchronization is made using FTFROM’s internal field sync separator.
March 1986
Single-chip colour CRT controller
(FTFROM)
Fig.24 Stand-alone synchronization mode.
Fig.25 Simple-slave (direct sync) mode.
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Product specification
SAA5355