2-18
Computer Group Literature Center Web Site
VMEchip2
2
In addition to the VMEbus timer, the chip contains a local bus timer. This
timer asserts the local TEA when the local bus cycle maintained in its
asserted state for longer that the programmed time-out period. This timer
can be enabled or disabled under software control. The time-out period can
be programmed for 8, 64, or 256 seconds.
Reset Driver
The chip includes both a global and a local reset driver. When the chip
operates as the VMEbus system controller, the reset driver provides a
global system reset by asserting the VMEbus signal SYSRESET
∗
. A
SYSRESET
∗
may be generated by the
RESET
switch, a power-up reset, a
watch dog timeout, or by a control bit in the LCSR. SYSRESET
∗
remains
asserted for at least 200 msec, as required by the VMEbus specification.
Similarly, the chip provides an input signal and a control bit to initiate a
local reset operation.
The local reset driver is enabled even when the chip is not the system
controller. A local reset may be generated by the
RESET
switch, a power
up reset, a watch dog time-out, a VMEbus SYSRESET
∗
signal, or a
control bit in the GCSR.
Local Bus Interrupter and Interrupt Handler
There are 31 interrupt sources in the VMEchip2 ASIC:
VMEbus ACFAIL interrupter
Tick timer 2-1
ABORT
switch
DMAC done
VMEbus SYSFAIL interrupter
GCSR SIG3-0
Write post bus error
GCSR location monitor 1-0
External input
Software interrupts 7-0
VMEbus IRQ1 edge-sensitive interrupter
VMEbus IRQ7-1 interrupts
VMEchip2 VMEbus interrupter acknowledge
Summary of Contents for MVME1X7P
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Page 90: ...1 64 Computer Group Literature Center Web Site Programming Issues 1 ...
Page 248: ...3 50 Computer Group Literature Center Web Site PCCchip2 3 ...
Page 286: ...4 38 Computer Group Literature Center Web Site MCECC Functions 4 ...
Page 288: ...A 2 Computer Group Literature Center Web Site Summary of Changes A ...
Page 316: ...Index IN 14 Computer Group Literature Center Web Site I N D E X ...