MB86290A Datasheet, PDF (99/184 Pages) Fujitsu Component Limited. – Graphics Controller Hardware Specifications

Bit 3
ASW (Attached SDRAM bit Width)
Sets data bus width of Graphics Memory interface
1
64 bit
0
32 bit
Bits 5-4
RAW (Row Address Width)
Set bit width of Row address
00
14 bit
11
13 bit
Others
Prohibited
Bits 9-6
RTS (Refresh Timing Setting)
Set refresh interval
1010
1024 clocks
1001
512 clocks
1000
256 clocks
0111
128 clocks
Others
Prohibited
99