DP8522AV-25 National Semiconductor, DP8522AV-25 Datasheet - Page 39

• 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

9 0 Programming and Resetting
9 3 EXTERNAL RESET
At power up if the internal power up reset worked all inter-
nal latches and flip-flops are cleared The power up state is
entered by asserting ML and DISRFSH for 16 positive edg-
es of CLK After 16 clocks if the user negates DISRFSH
before negating ML as shown in Figure 51 ML negated
FIGURE 52 Chip Reset but Not Programmed
FIGURE 51 Chip Reset and Programmed
(Continued)
39
will program the chip If ML is negated before or at the same
time as DISRFSH as shown in Figure 52 the chip will not be
programmed After the chip is programmed the 60 ms ini-
tialization period will be entered into if this is the first pro-
gramming after power up or reset The user must perform
an external reset before programming the DP8520A 21A
22A
TL F 9338 – A2
TL F 9338 – A3