BVME310
Copyright
1997 BVM Ltd.
6
3.8 VMEbus System Controller Functions
The BVME310 provides a number of system controller functions that may be enabled as follows:-
RESET
Asserted if the +5V falls below +4.7V or the Reset button is pressed, when link selected. VMEbus
RESET has a minimum asserted period of 200mS.
Arbitration
The BVME310 is configured to support Single level arbitration when link selected.
SYSCLK
The BVME310 provides a 16MHz VMEbus SYSCLK when link selected.
VMEBERR
The BVME310 provides a 25.6
µ
S Bus Timeout BERR signal when link selected.
3.9 Reset Management/ Configuration Switch
A MAX700 is used to control the CPU Reset. The device will provide Reset when either the Voltage
drops below 4.7V or the front Panel Reset is pressed. The Reset pulse is in excess of 200mS. Link
configuration allows an external VMEbus module to generate Processor Reset.
The BVME310 has no configuration switch, but a combination of multiple RESET depressions and
SRAM storage can be used to allow access to a configuration program.
3.10 Local Bus Monitor
The BVME310 provides a 25.6
µ
S a local Bus Timeout BERR signal for internal accesses, BERR for
external accesses is set by the system controller.
3.11 LED Indicators
GREEN LED
Indicates processor activity.
RED LED
Indicates EXTERNAL activity (to the VMEbus).
