DP8522AV-25 National Semiconductor, DP8522AV-25 Datasheet - Page 27

• Manufacturer Part Number: DP8522AV-25
• Description: IC CTRLR 4M VRAM 25MHZ 68PLCC
• Manufacturer: National Semiconductor

Specifications of DP8522AV-25

• Controller Type: Video RAM Controller, Drivers
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 68-LCC (J-Lead)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Current - Supply: -
• Voltage - Supply: -
• Interface: -
• Other names: *DP8522AV-25

6 0 DP8520A 21A 22A Video RAM Support
6 2 SUPPORT FOR VRAM ACCESS CYCLES THROUGH
PORT A USING THE DP8520A 21A 22A
With the DP8520A 21A 22A the output DT OE will remain
negated during write accesses (see Figure 27 ) but during
read accesses it will assert after CASn asserts DT OE will
FIGURE 27 Video RAM Random Access Write Cycle
FIGURE 28 Video RAM Random Access Read Cycle
27
Figure 28 ) causing the VRAM outputs to be enabled If
be negated for a read access once CASn is negated (see
CASn toggles during a page mode read access then the
DT OE logic will also toggle following the CASn input
(Continued)
TL F 9338 – 54
TL F 9338 – 53