Hardware manual

EUROCOM-17-5xx 3 Programmers Reference
Hardware Manual 47
3 Programmers Reference
3.1 Address Map
The EUROCOM-17-5xx is designed to utilize the entire 4GB address
range of the 68040 chip. Using the address modifier of the VMEbus, the
address range may be enlarged by subdivision into data and program areas
and/or user and supervisor areas. The EUROCOM-17-5xx recognizes two
address areas: the local address space and the global VMEbus address
space.
1. Y = /TCI driven high, N = /TCI driven low.
2. Y = /TBI driven high, N = /TBI driven low.
3. Caching may be enabled via system control register.
Table26: Address Assignment of EUROCOM-17-5xx
Address Range Device VMEbus
Address Modifier
Cache
1)
Burst
2)
Access
Width [b]
$0000.0000 - $0FBF. FFFF Local RAM local Y Y 32
$0FC0.0000 - $0FCF.FFFF Video RAM local Y Y 32
$0FD0.0000 - $0FDF.FFFF Reserved - - - -
$0FE0.0000 - $0FEF.FFFF Overlay RAM local Y Y 32/16
$0FF0.0000 - $0FFF.FFFF Reserved - - - -
$1000.0000 - $1FBF.FFFF Local RAM (mirrored) local N Y 32
$1FC0.0000 - $1FCF.FFFF Video RAM (mirrored) local N Y 32
$1FD0.0000 - $1FDF.FFFF Reserved - - - -
$1FE0.0000 - $1FEF.FFFF Overlay RAM (mirrored) local N Y 32/16
$1FF0.0000 - $1FFF.FFFF Reserved - - - -
$2000.0000 - $FE3F.FFFF VMEbus Extended I/O A32 N
3)
N 32/16/8
$FE40.0000 - $FE7F.FFFF LEB local N N 32/16/8
$FE80.0000 - $FE9F.FFFF Flash EPROM local Y N 8
$FEA0.0000 - $FEBF.FFFF User EPROM local Y N 8
$FEC0.0000 - $FECF.FFFF Local I/O local N N 32/16/8
$FED0.0000 - $FEFF.FFFF Reserved - - - -
$FF00.0000 - $FFFE.FFFF VMEbus Standard I/O A24 N N 32/16/8
$FFFF.0000 - $FFFF.FFFF VMEbus Short I/O A16 N N 16/8