Datatech Enterprises 386/25, User Manual

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• SBE1
This output signal (active low) indicates when the 32-bit memory board
should operate on D8 through D15.
• SBE2
This output signal (active low) indicates when the 32-bit memory board
should operate on D16 through D33.
• SBE3
This output signal (active low) indicates when the 32-bit memory board
should operate on D24 through D31.
• RA17-RA23, RA31, RF25
These outputs are qualified to enable each bank of memory.
• REFRESH
This output signal indicates a refresh cycle.
• BAMEMR
This output signal (active low) orders the memory device to output data
to the data bus.
• BAMEMW
This output signal (active low) instructs the memory devices to store
the data present on the data bus.
• MRAS
This output signal (active low) provides the “RAS” signal to the DRAM.
• MCAS
This output signal (active low) provides the “CAS” signal to the DRAM.
• ERR0/ERR3
This output signal (active low) indicates the RAM card DRAM parity
error.
Chapter 6: Appendix 29