M5M410092BRF Datasheet, PDF (14/204 Pages) Mitsubishi Electric Semiconductor – 3D-RAM (M5M410092B)

MITSUBISHI
ELECTRONIC DEVICE GROUP
Rev. 1.03
3D-RAM (M5M410092B)
8-bit color components—R, G, B, or a—for all
1280 x 1024 pixels; (2) Each 3D-RAM holds all 32
bits of a pixel value for 320 x 1024 pixels, allowing
fast scrolling in the vertical direction and
interleaving four 3D-RAMs in the horizontal
direction.
If the width of the data bus from the rendering
System Interface
controller to 3D-RAM is reduced to 64 bits, then
two pixels are transferred in one cycle. Similarly, a
32-bit data bus can transfer only one pixel at a
time.
Chapter 6 provides more examples of frame
buffer organizations using 3D-RAMs, such as
1280 x 1024 x 8, 320 x 1024 x 32, etc.
Address & Control
Rendering Controller
Pixel Data
32
32
32
32
3D-RAM
3D-RAM
3D-RAM
3D-RAM
Monitor
Video
Control
Video Data ¹⁶
Video Data ¹⁶
Video Data ¹⁶
Video Data ¹⁶
RAMDAC
Figure 1.1 1280 x 1024 x 32 frame buffer consisting of four 3D-RAMs, shown together with a rendering control-
ler and a RAMDAC
2