Motorola MVME162, Руководство пользователя

Страница: 56 / 106

Operating Instructions
3-4 User’s Manual
3
N
otes
1. Reset enables the decoder for this space of the memory map so
that it will decode address spaces $FF800000 - $FF9FFFFF and
$00000000 - $003FFFFF. The decode at 0 must be disabled in
the MCchip before DRAM is enabled. DRAM is enabled with
the DRAM Control Register at address $FFF42048, bit 24.
PROM/Flash is disabled at the low address space with PROM
Control Register at address $FFF42040, bit 20.
2. This area is user-programmable. The DRAM and SRAM
decoder is programmed in the MCchip, the local-to-VMEbus
decoders are programmed in the VMEchip2, and the IP
memory space is programmed in the IPIC.
3. Size is approximate.
4. Cache inhibit depends on devices in area mapped.
Table 3-1. Local Bus Memory Map
Address Range Devices Accessed Port Width Size
Software
Cache
Inhibit
Notes
Programmable DRAM on Board D32 1MB-8MB N 2
Programmable
SRAM
D32 128KB-2MB N 2
Programmable VMEbus A32/A24 D32/D16 -- ? 4
Programmable IP_a Memory D32-D8 64 KB-8 MB ? 2, 4
Programmable IP_b Memory D32-D8 64 KB-8 MB ? 2, 4
Programmable IP_c Memory D32-D8 64 KB-8 MB ? 2, 4
Programmable IP_d Memory D32-D8 64 KB-8 MB ? 2, 4
$FF800000-$FF9FFFFF Flash/EPROM D32 2 MB N 1, 5
$FFA00000-$FFBFFFFF EPROM/Flash D32 2 MB N 6
$FFC00000-$FFCFFFFF Not Decoded D32 1 MB N 7
$FFD00000-$FFDFFFFF Not Decoded D32 1 MB N 7
$FFE00000-$FFE7FFFF SRAM default D32 512 KB N --
$FFE80000-$FFEFFFFF Not Decoded -- 512 KB N 7
$FFF00000-$FFFEFFFF Local I/O Devices
(Refer to next table) D32-D8 878 KB Y 3
$FFFF0000-$FFFFFFFF VMEbus A16 D32/D16 64 KB ? 2, 4