MB87P2020 Datasheet, PDF (52/356 Pages) Fujitsu Component Limited. – Colour LCD/CRT/TV Controller

MB87J2120, MB87P2020-A Hardware Manual
Table 1-8 lists the supported bus access types for different address areas and data modes for Lavender and
Table 1-8: Bus access types for Lavender and Jasmine
Address area
Input FIFO
Output FIFO
Register space^a
SDRAM space
Lavender
32Bit data mode 16Bit data mode
(MODE[2]=1)
(MODE[2]=0)
word
word
word
word
word, halfword,
byte
word, halfword,
byte
word
word
a. without input and output FIFO
Jasmine
32Bit data mode 16Bit data mode
(MODE[2]=1) (MODE[2]=0)
word
word
word
word
word, halfword, word, halfword,
byte
byte
word, halfword,
byte
word, halfword,
byte
Jasmine. Note that for input and output FIFO only word access is allowed. Partial access can not be sup-
ported because every write/read access increments internal pointers.
Figure 1-5 shows the address to register mapping within display controller. Note that MB91xxxx MCUs use
MCU address space
Display controller register
Address 7
0
31 _{WRX[0] WRX[1] WRX[2] WRX[3] 0}
Byte 0 Byte 1 Byte 2 Byte 3
Figure 1-5: MCU address to display controller register mapping
Big Endian byte order which means that byte0 is the MSB byte of a 32Bit word. Every byte has its own
valid signal (ULB_WRX[3:0]) and a combination of valid signals determines the access type for a write
access.
For reading always the whole bus width depending on data mode (32- or 16Bit) is transferred from display
controller to MCU. The MCU selects the right part for current read instruction internally.
1.4.5 Display controller data modes (32/16 Bit interface)
MB91xxxx MCUs are able to communicate with devices with different bit sizes for data bus (32-, 16- and
8Bit). Normally Lavender and Jasmine were designed to act as 32Bit devices. In this mode optimal perform-
ance can be achieved and no internal data mapping is necessary.
For special purposes both display controller can act as 16Bit devices. With help of this mode parts of data
bus can be made available as general purpose I/O pins or it may be possible to connect the display controller
to a 16Bit MCU¹.
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