DP8522AV-25 National Semiconductor, DP8522AV-25 Datasheet - Page 35

• 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

8 0 RAS and CAS Configuration Modes
8 4 ERROR SCRUBBING
In error scrubbing during refresh the user selects one two
or four RAS and CAS outputs per bank When performing
error detection and correction memory is always accessed
FIGURE 42 VRAM Array Setup for 4 Banks Using Error Scrubbing (C6 C5 C4
FIGURE 43 VRAM Array Setup for Error Scrubbing with 2 Banks (C6 C5 C4
FIGURE 40 VRAM Array Setup for 4 Banks Using Address Pipelining (C6 C5 C4
FIGURE 41 VRAM Array Setup for Address Pipelining with 2 Banks (C6 C5 C4
or C6 C5 C4
or C6 C5 C4
e
e
0 1 0 (Also Allowing Error Scrubbing) during Programming)
0 0 1 (Also Allowing Error Scrubbing) during Programming)
35
(Continued)
as words Since the CAS signals are not used to select
individual bytes their corresponding ECAS inputs can be
tied low as shown in Figures 42 and 43
e
e
0 0 1 during Programming)
0 1 0 during Programming)
TL F 9338– 91
e
e
1 0 1
TL F 9338 – 92
1 1 1
TL F 9338 – 94
TL F 9338 – 93