FOCUS Enhancements FS453 - Manual (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
27
GCC
FS453
CLK OUT
CLK IN
SYNC
DATA
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
DATA
SYNC
CLK IN
SLAVE MODE DIAGRAM
JANUARY, 2005, VERSION 3.0 36 COPYRIGHT ©2003-4 FOCUS ENHANCEMENTS, INC.
FOCUS Enhancements Semiconductor