FOCUS Enhancements FS453 User Manual download pdf (Page 36)

FS453/4 AND FS455/6 DATA SHEET: HARDWARE REFERENCE

9.4.3.1 Pseudo-master Mode

In Pseudo-master Mode shown below, the FS453 has complete control of the graphics system clock, but

relinquishes the video sync signals to the GCC. The GCC provides the FS453 with a complete

complement of digital video signals at the rate of the FS453 clock (CLKOUT).

Figure 13: Pixel Clock Pseudo-master Mode

PSEUDO-MASTER MODE DIAGRAM

GCC

FS453

CLK OUT

CLK IN

SYNC

DAT

9.4.3.2 Slave Mode

In Slave Mode shown below, the FS453 is under the complete control of the GCC. The GCC provides

the FS453 with all of the signals needed to produce an analog video signal. One must be careful when

using the Slave Mode. Since the FS453 cannot control the GCC clock, the scalability of video images is

limited. Additionally, if the GCC has a poor quality clock, the system will produce poor quality images.

Figure 14: Pixel Clock Slave Mode

GCC

FS453

27 MHz

DAT

SYNC

CLK IN

SLAVE MODE DIAGRAM

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FOCUS Enhancements FS453 User Manual Page 36