DP8522AV-25 National Semiconductor, DP8522AV-25 Datasheet - Page 23

• 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

ures 22 23 and 58a
6 0 DP8520A 21A 22A
Video RAM Support
The DP8520A 21A 22A provides full support for all access
modes of video RAMs through the addition of three pins
(AVSRLRQ
DP8420A 21A 22A The access modes of video RAMs can
be split up into two groups video RAM transfer cycles (read
with the serial port in active or in standby mode write and
pseudo write transfer cycles) and non-transfer cycles The
DP8520A 21A 22A support of video RAMs allows the full
capabilities of the National Semiconductor Advanced
Graphics chip set (DP8500 Series) to be realized See Fig-
FIGURE 23 The DP8500 Raster Graphics Processor Interfaced to the DP8520A 21A 22A Video RAM Controller
VSRL
and
DT OE)
to
the
standard
23
Ideal solution for graphics frame buffer Screen refresh
can occur at the same time as random access to the
FIGURE 22 The Video RAM (A Dual Ported Memory)
frame buffer for screen update and manipulation
TL F 9338 – 52
TL F 9338 – 56