MB87P2020 Datasheet, PDF (178/356 Pages) Fujitsu Component Limited. – Colour LCD/CRT/TV Controller

MB87J2120, MB87P2020-A Hardware Manual
xstart
timing coordinate space
xstop
ystart
current position
14
X
0 F 14
Y
0
ystop
next position to match
==
enable
Addr
Incr.
Sequencer
RAM
Sequencer out
Figure 3-9: Matching whole sequences of positions with the Sync Sequencer.
The operation is as follows: At the begin, the address counter is reset to zero and the RAM outputs the first
position to match and the output value for this position. If the comparator signals a match, the RAM address
is incremented, the preset output value is propagated and the RAM now outputs the next position to match.
This match/address increment cycle continues until the programmed sequence length is reached. If the last
position is matched, the address counter is reset to zero again and the cycle starts anew. It is thus possible
to generate arbitrarily complex waveforms with up to 64 edges (which is the maximum sequence length).
3.10.4 Combining First-Stage Sync Signals
As shown above, there are six sync pulse generator outputs and one sync sequencer output. To obtain more
complex waveforms, these signals can be combined in a second stage. Here, an array of eight sync mixers
(SMx) is used to calculate Boolean functions of first-stage signals. Each sync mixer can form any Boolean
function of up to five inputs. The basic structure of one such mixer is depicted in fig. 3-10
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