Force Computers SYS68K/CPU-40, User Manual

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SECTION 7 INTRODUCTION TO VMEPROM
4-1
4. SPECIAL VMEPROM COMMANDS FOR CPU BOARD
The following commands are implemented on the CPU board in addition to those listed in the
VMEPROM User's Manual.
4.1 ARB - Set the Arbiter of the CPU Board
Format: ARB
The ARB command allows the user to set the arbitration mode of the CPU board for VMEbus. This
command is also used to select the Standard Access Mode for the VMEbus. Additionally, the
VMEbus interrupts can be enabled or disabled.
Example:
? ARB<cr>
Current arbiter mode: enabled, Mode = Prioritized ROUND ROBIN
Set arbiter mode ? (Y,y/-) : Y
ROUND ROBIN mode ? (Y,y/-) :Y
Prioritized ROUND ROBIN ? (Y,y/-) : N
New arbiter mode = ROUND ROBIN
Standard Access Mode (A24) for Slave Accesses currently disabled.
Enable A24 mode ? (Y,y/-) : Y
A31-A24 = 80
Change interrupt mask ? (Y,y/-) : Y
Enable(1) / Disable(0) VMEbus interrupts by level:
STATUS:
Level: 7 6 5 4 3 2 1
1 1 1 1 1 1 1
SET:
Enter new interrupt mask: 1 1 1 1 1 1 0
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