MB87P2020 Datasheet, PDF (346/356 Pages) Fujitsu Component Limited. – Colour LCD/CRT/TV Controller

MB87J2120, MB87P2020-A Hardware Manual
ommended to disable/interrupt MCU-DMAC directly. See table 2-10 for a reset sequence example.
The reset of MCU-DMAC is already included in C-API function ULB_DMA_HDG.
In case of direct MCU reset DMAFLAG_DSTP should be set to ‘0’ in order to avoid unintentional interrup-
tion. With this setting no ULB_DSTP impulse is generated by the graphic controller.
The ULB_DSTP pin must not be used; it will not be supported any longer.
Table 2-10 gives an overview and a classification about the described problem.
Table 2-10: Overview for DSTP function
Subject
Description
Classification
Effects without
workaround
Solution/Workaround
Concerned devices
Testcase
Description
ULB_DSTP signal is sometimes not generated.
HW limitation
MCU DMA-Controller is not reset correctly. Additional data may be sent
after SWReset or DMA turn off.
ULB_DSTP signal must not be used. Instead turn off MCU DMA-Control-
ler before sending SWReset to Jasmine/Lavender or disable DMA via
DMAFLAG_EN.
MCU-DMAC reset sequence:
1.) DMACA[30] = 0
2.) DMACA[31] = 0
GDC-API function ULB_DMA_HDG takes care of this issue.
MB87J2120 (Lavender)
MB87P2020 (Jasmine)
MB87P2020-A (Jasmine redesign)
EMDC: ULB.5 and ULB.13
2.9 Software Reset for command execution
For Jasmine the SwReset command does not reset parts of command controller correctly. As a consequence
the following commands are not executed properly. They may be finished too early.
Lavender does not have this problem due to a different command controller structure.
As workaround a NoOp can be executed after SwReset. This is already included into C-API.
Table 2-11 gives an overview and a classification about the described problem.
Table 2-11: Overview for Software Reset (incomplete reset)
Subject
Description
Classification
Effects without
workaround
Solution/Workaround
Concerned devices
Description
Parts of Command Controller will not be reset with SWReset command.
HW limitation
After SWReset next command may not be executed properly.
Send a NoOp command after SWReset command.
The NoOp command is already included in API function
’GDC_CMD_SwRs’.
not present for MB87J2120 (Lavender)
MB87P2020 (Jasmine)
MB87P2020-A (Jasmine redesign)
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