
BVME310
Copyright
1997 BVM Ltd.
9
1 & 2 Fitted
›
27C512 (512Kbit) or 27C010 (1Mbit) devices
2 & 3 Fitted
27C020 (2Mbit) devices
FL1 determines the EPROM size supported by the BVME310. When FL1 is fitted in positions 1 and 2,
the BVME310 will support 27C512 or 27C010 devices giving 128/256Kbytes of EPROM space. When
FL1 is fitted in positions 2 and 3, the BVME310 will support 27C020 devices giving 512Kbytes of
EPROM space.
On the 451-48011 variant FL1 is fitted with a factory link permanently in position 1 and 2 and therefore
the BVME310 should only be fitted with 27C512 or 27C010 devices. On the 451-48013 variant the
user may select the EPROM size, by default the link is set to position 1 and 2.
The BVME310 should always be fitted with 250nS devices or faster regardless of size.
5.2.2 JPRB Interrupt Handler Options
Link Setting
Interrupt Level
Interrupt Source
Acknowledge type
1 & 18 Fitted
›
7
Abort Switch
Autovectored
1 & 9 Fitted
7
VMEbus ACFAIL
Autovectored
1 & 8 Fitted
7
VMEbus BCLR
Autovectored
1 & 17 Fitted
7
VME IRQ7
Autovectored
2 & 16
›
6
VME IRQ6
Vectored
3 & 15
›
5
VME IRQ5
Vectored
4 & 14
›
4
VME IRQ4
Vectored
5 & 13
›
3
68681 IRQ
Vectored
5 & 10
3
VME IRQ3
Vectored
6 & 12
›
2
VME IRQ2
Vectored
7 & 11
›
1
VME IRQ1
Vectored
JPRB is used to select the interrupt sources for the BVME310 as shown in the table above. It is
recommended that for a level where more than one interrupt source is available, only one is chosen
except ABORT and VMEbus ACFAIL where both may be set to generate IRQ7. FL2 may also be
used to select VMEbus ACFAIL, and when set will be enabled regardless of the setting on JPRB.