MB87P2020 Datasheet, PDF (142/356 Pages) Fujitsu Component Limited. – Colour LCD/CRT/TV Controller

MB87J2120, MB87P2020-A Hardware Manual
vref
field
input data
odd even
one frame if odd_field_first=0
one frame if odd_field_first=1
lines
layer
Figure 3-5: odd_field_first flag: mode of action
VICPCTRL (4010H):
The flags in this word set the polarity of input control signals (vact, vref, alpha, field). Note that those bits
only influence the behaviour of VIC if Videoscaler-Mode is enabled as video source
(VICVISYN[1:0]=0b00).
Related register: VICVISYN[1:0]
VICFSYNC (4014H):
Synchronization of video input and video output is frame/field based. Frame synchronization unit is to en-
sures correct order of pictures and avoids overtaking of read and write pointer in the same active layer. Two
modes are possible and can be selected by VICFSYNC[15] (SYNC).
bit 15 (SYNC):
If Layer Sync Mode (SYNC) is set to 1, the 3 layer synchronization mode will be used. The used memory
space is reduced by selecting three layer mode and setting all layer addresses (VICFCTRL[3:0], VICFC-
TRL[7:4], VICFCTRL[11:8]) to the same layer number. Then video input and output are not synchronized.
In two layer mode (SYNC=0) the synchronization will be performed by comparing vertical read/write po-
sition (GPU/VIC) in actual layer. There are two layers for video I/O (primary layer: VICFCTRL[3:0], sec-
ondary layer VICFCTRL[7:4]). The third layer address (VICFCTRL[11:8]) has no effect.
Releated registers: VICFSYNC[16], VICSYNC[14:0], VICFCTRL[3:0], VICFCTRL[7:4], VICFC-
TRL[11:8]
bit 16 (REL):
This bit has relevance if VICFSYNC[15] is set to 0 (2-layer-mode).
The Frame Rate Relation (REL) flag indicates the relation between input (VIC) and output (GPU) frame
rate. The faster unit toggles its layer each time a layer is fully processed. The other unit compares its line
pointer with the switch level VICFSYNC[14:0] (SWL) to decide, which layer using next. For example, if
REL is set to 0, frame output rate is higher than frame input rate. The current active VIC layer toggles with
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