Bt457 ramdac equivalent, monolithic cmos 256-color palette ramdac.
include programmable blink rates, bit plane masking and blinking, color overlay capability, and a dual-port color palette RAM.
Functional Block Diagram
CLOCK* CLOCK
VA.
* High-resolution color graphics
* CAE/CAD/CAM
* Image processing
* Video reconstruction
LD*
P[7:0] 40 .
Pin Descriptions
The Bt4978 is available in both 84-pin Plastic Leaded Chip Carrier (PLCC) and Ceramic PGA packages, as illustrated in Figure 1 and 2. Pin descriptions are provided in Table 1. Pin labels for the PGA package are given in Table 2.
Fig.
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