Hardware manual

1 Specification EUROCOM-17-5xx
12 Hardware Manual
Figure3: Graphic Interface Building Blocks
DAC
MUX ‘153
VRAM Controller/
Address Generator
MACH 445
25.175
MHz
PLL
MUX
‘257
4:1
2:1
CLUT
Digital
Output
VGA
15-Pin Min-D
GA(0:8)
LD(0:31) LA(2:19)
I/O Bus
TRA(2:19)
CBLANK VCSYNC HSYNC VIDCLK
SCLK
QSF
DSF
/RAS
/CAS
/OE
P(0:63)
CPU
DR DG DB DI PCLK BLANK
R
G
B
HSYNC VSYNC
EN
BT445
DAC
DAC
Sync
Generator
LM1882
0.5 MB
Overlay RAM
1 MB
Video RAM
Bus