Force Computers SYS68K/CPU-40, User Manual

Page: 180 / 372

SECTION 3 HARDWARE USER'S MANUAL
6-25
6.7 Exception Signals
The VMEbus defines the signals ACFAIL, SYSFAIL, and RESET for signaling exceptions or status.
The ACFAIL and the SYSFAIL signals of the VMEbus are connected to the FGA-002 Gate Array.
The FGA-002 may be programmed to generate interrupts on SYSFAIL and ACFAIL. For detailed
information please refer to the FGA-002 User's Manual.
VMEPROM monitors the SYSFAIL line during the initialization of external intelligent I/O boards. The
ACFAIL line is ignored by VMEPROM.
The FGA-002 drives the SYSFAIL line after Reset until initialization of the board is completed.
To remain compatible to older boards this signal can be enabled and disabled via a jumper setting at B13.
Jumper 2-7 inserted SYSFAIL driven (default)
Jumper 2-7 removed SYSFAIL not driven
The usage of jumperfield B13 is shown in the following figure, and the location diagram of the SYSFAIL
jumperfield is outlined in the figure on the next page.
Figure 6-5: Usage of Jumperfield B13
"SYSFAIL driven if jumper 2-7 is inserted"
B13
8 7 6 5
o o o o
|
o o o o
1 2 3 4