MB87P2020 Datasheet, PDF (334/356 Pages) Fujitsu Component Limited. – Colour LCD/CRT/TV Controller

MB87J2120, MB87P2020-A Hardware Manual
Subject
Effects without
workaround
Solution/Workaround
Concerned devices
Testcase
Table 1-2: Overview for ULB_DREQ timing
Description
One data word more than expected can be delivered by MCU.
For MB87P2020 (Jasmine) a hardware solution is already implemented
with a two word overflow buffer.
For MB87J2120 (Lavender) the count of waitstates during DMA transfer
should be set equal or larger than two.
MB87J2120 (Lavender)
fixed for MB87P2020 (Jasmine)
fixed for MB87P2020-A (Jasmine redesign)
EMDC: ULB.5
1.3 CLKPDR master reset
CLKPDR, bit[15] is write only. Read access returns always ‘0’. Writing ‘1’ initiates global master reset,
writing a ‘0’ releases master reset.
Table 1-3 gives an overview and a classification about the described problem.
Table 1-3: Overview for master reset
Subject
Description
Classification
Effects without
workaround
Solution/Workaround
Concerned devices
Testcase
Description
The reset status can not read back.
Hint
CLKPDR_MRST is write only. Reading always return ’0’.
If the reset status has to be memorized it has to be done externally.
Normally this sequence should reset Jasmine/Lavender safely:
G0CLKPDR_MRST=1;
G0CLKPDR_MRST=0;
MB87J2120 (Lavender)
MB87P2020 (Jasmine)
MB87P2020-A (Jasmine redesign)
EMDC: CTRL.1 (I/O march)
1.4 MAU (Memory Access Unit) commands
For Lavender drawing commands (PutPixel, PutPxWd, PutPxFC, GetPixel, XChPixel, DwLine, DwRect
and DwPoly) the target layer has to be always included into data stream (pixel addresses).
For Jasmine only commands PutPixel, PutPxWd, PutPxFC, GetPixel and XChPixel can’t use the layer reg-
ister PPCMD_LAY while the other drawing commands can use it. MAU has its own dedicated layer man-
agement and could not have benefit from the enhancement.¹
1. The target layer register PPCMD_LAY can be used for pixel engine commands if PPCMD_ULAY is set to
’1’.
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