Motorola MVME1X7P - Manual (Page 283)

Programming Model
http://www.motorola.com/computer/literature 4-35
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9. Ensure that the zero-fill stops after one pass by clearing the
SCRBEN bit in the Scrub Control register. (Clear bit 27 of offset
$24.)
10. Wait for the zero-fill to complete by waiting for the SCRB bit in the
Scrub Control register to be cleared. (Wait for bit 28 of offset $24 =
0.)
11. Clear the ZFILL bit in the MCECC pair. (Clear Bit 28 of offset $20.)
12. The entire DRAM that is controlled by this MCECC is now zero-
filled. The software can now program the appropriate scrubbing
mode and other desired initialization, and enable DRAM for
operation.