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The operating clock and display dot clock frequencies can be set to any values within the following
range:
(1) Operating clock frequency ≥ 2 × display dot clock frequency
(2) Operating clock frequency = 2 × display dot clock frequency and the operating clock
and display dot clock are synchronized
Drawing operations can therefore be performed at maximum speed without being influenced by the
characteristics of the display device.
3 . 2
UGM (Unified Graphics Memory) Control
3 . 2 . 1
Overview
The memory connected to the Q2 (graphics memory) is used for the following purposes.
1. Frame buffers
Q2 drawing area and display area.
2. Display list (command list)
Area that stores the Q2 drawing command list. The Q2 fetches commands from this area while
carrying out drawing operations.
3. Source areas, work areas, etc.
Used as the source area that stores painting patterns and font data, the FTRAP command
drawing area, and so on.
The UGM can be allocated to part of the CPU's main memory area. Figure 3-1 shows a sample
system configuration using UGM, and figure 3-2 shows an example of UGM mapping onto the
CPU memory space.
CPU bus
Main memory
Figure 3-1
26
CPU
Q2
UGM
Example of System Configuration Using UGM
Display data
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