MB87P2020 Datasheet, PDF (120/356 Pages) Fujitsu Component Limited. – Colour LCD/CRT/TV Controller

MB87J2120, MB87P2020-A Hardware Manual
to the needed SDC arbitration time has much less influence when multiple data words are transferred as
packet at once. Additional performance increase is reached because of FIFO buffering. IPA is used if the
following commands are executed:
• PutPA, write address and data field of variable size via Input FIFO
• GetPA (n), read n data words via Output FIFO
The SDC interface multiplexes between IPA and DPA devices and controls its concurrence. DPA has prec-
edence over IPA.
There is no necessity for physical access of video data only. Not used video memory, i.e. if the memory is
not assigned in the Layer Description Record (LDR, see GDC registers), can be used for general purposes.
If pixel data should be accessed the logical to physical address mapping has to be considered (see SDRAM
Controller Specification). For non-image data addressing can be in a linear way.
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