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MB86R02 'Jade-D' Hardware Manual V1.64
FBR (Frame buffer Base)
Register
DrawBaseAddress + 440
address
Bit number
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Bit field name
R/W
Initial value
This register stores the base address of the drawing frame.
Bit 25 to 0
FBASE (Frame BASE address)
This field indicates the same frame base address as Coral.
The actual address for VRAM is calculated by adding the segment address to FBASE.
Bit 26
SeGment address
This field indicates the segment address.
0
1
XRES (X Resolution)
Register
DrawBaseAddress + 444
address
Bit number
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Bit field name
R/W
Initial value
This register sets the drawing frame horizontal resolution.
ZBR (Z buffer Base)
Register
DrawBaseAddress + 448
address
Bit number
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Bit field name
R/W
Initial value
This register sets the Z buffer base address.
The actual address for VRAM is calculated by adding the segment address of FBR to ZBASE.
TBR (Texture memory Base)
Register
DrawBaseAddress + 44C
address
Bit number
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Bit field name
R/W
Initial value
This register sets the texture memory base address.
The actual address for VRAM is calculated by adding the segment address of FBR to TBASE.
18-220
H
SG
RW
0
Indicates Segment 0 based address 4000_0000
Indicates Segment 1 based address 4400_0000
H
H
H
FBASE
RW
Don't care
.
H
.
H
ZBASE
RW
Don't care
TBASE
RW
Don't care
R0
0
XRES
RW
Don't care
R0
0
R0
0
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