17
BVME4000/6000
Copyright
1993,1995,1998,2001 BVM Ltd.
5.2.11 LK21 SRAM Backup Selection
Figure 14 LK21 SRAM
Backup Selection
Location
This link enables the SRAM to be backed up by the on-board battery. The SRAM is always backed up
by the 0.1F Memory Capacitor and the VMEbus STDBY supply.
LK21
Function
1 & 2 Fitted
SRAM is backed up by battery or MEMCAP/VMEbus STDBY
1 & 2 Omitted
#
SRAM is only backed up by MEMCAP/VMEbus STDBY
5.2.12 LK22 VMEbus System Controller Enable
Figure 15 LK22 VMEbus
System Controller
Enable Location
This link forces the BVME4000/6000 to be the VMEbus System Controller, so the BVME4000/6000
performs as the VMEbus arbiter, drives VMEbus SYSCLK and VMEbus BCLR. The normal selection
for this function is in the Board Control Register when not overridden by this link - refer to "7.13.3 Port
B Usage (on page 52)". Omitting this link is typically required to ensure that the VMEbus SYSCLK
signal is driven as the VMEbus RESET signal is de-asserted.
LK22
Function
1 & 2 Omitted
BVME4000/6000 VMEbus System Controller ENABLED
1 & 2 Fitted
#
BVME4000/6000 VMEbus System Controller set in BCR
PERIPHERAL
CONTROLLER
XM1
LOW
PROM
HIGH
PROM
1
2
ADDRESS
MAP
CONTROLLER
LK21
PERIPHERAL
CONTROLLER
XM1
LOW
PROM
HIGH
PROM
1 2
ADDRESS
MAP
CONTROLLER
LK22
Содержание BVME4000
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