4-22
Computer Group Literature Center Web Site
MCECC Functions
4
STON2-STON0
STON2-STON0 control the amount of time that the
scrubber occupies the DRAM before providing a window
during which the local bus and refresher might use it.
They control the on time as follows:
STOFF2
STOFF1
STOFF0
Scrubber Time Off
0
0
0
Request DRAM immediately
0
0
1
Request DRAM after 16 BCLK cycles
0
1
0
Request DRAM after 32 BCLK cycles
0
1
1
Request DRAM after 64 BCLK cycles
1
0
0
Request DRAM after 128 BCLK cycles
1
0
1
Request DRAM after 256 BCLK cycles
1
1
0
Request DRAM after 512 BCLK cycles
1
1
1
Request DRAM never
STON2
STON1
STON0
Scrubber Time On
0
0
0
Keep DRAM for 1 memory cycle
0
0
1
Keep DRAM for 16 BCLK cycles
0
1
0
Keep DRAM for 32 BCLK cycles
0
1
1
Keep DRAM for 64 BCLK cycles
1
0
0
Keep DRAM for 128 BCLK cycles
1
0
1
Keep DRAM for 256 BCLK cycles
1
1
0
Keep DRAM for 512 BCLK cycles
1
1
1
Keep DRAM for TOTAL SCRUB TIME
Summary of Contents for MVME1X7P
Page 16: ...xvi ...
Page 18: ...xviii ...
Page 20: ...xx ...
Page 26: ...xxvi ...
Page 90: ...1 64 Computer Group Literature Center Web Site Programming Issues 1 ...
Page 248: ...3 50 Computer Group Literature Center Web Site PCCchip2 3 ...
Page 286: ...4 38 Computer Group Literature Center Web Site MCECC Functions 4 ...
Page 288: ...A 2 Computer Group Literature Center Web Site Summary of Changes A ...
Page 316: ...Index IN 14 Computer Group Literature Center Web Site I N D E X ...