EMAC MicroPac 535, Справочник по аппаратуре

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MEMORY DEVICES
In addition to the 80535 microprocessor's 256 bytes of internal data RAM, it also externally accesses 64K of program memory (read only)
and 64K of data memory (read/write). With the memory glue logic and option jumpers included on the MicroPac 535, external memory
access capabilities have been doubled to 128K each of program and data memory. Following are described two types of memory maps
that are available for these external memory devices depending on the positions of the jumpers in JP1.
PROGRAM/DATA CONFIGURATION
This configuration requires the use of a 32K EPROM and allows program execution in external RAM addresses 0:8000-0:FFFF (or also
1:8000-1:FFFF if a 128K RAM is installed and P5.1 is set). It causes program memory and data memory, when pointing to addresses
above 8000 hex, to select the same RAM addresses. To enable this, the jumpers should be set as shown below:
1 2 3 4 5 6
JP1 o o-o o o-o
MEMORY MAP
0000 8000 FFFF
PROGRAM MEMORY
32K EPROM
PROGRAM/DATA MEMORY
32K RAM: ADDRESS 8000-FFFF
128K RAM:
P5.0=0 DEVICE ADDRESS 0:8000-0:FFFF
DATA MEMORY P5.0=1 DEVICE ADDRESS 1:8000-1:FFFF
P5.1=0 MEMORY MAPPED I/O
P5.1=1 128K RAM ACCESS
P5.0=0 DEVICE ADDRESS 0:0000-0:7FFF
P5.0=1 DEVICE ADDRESS 1:0000-1:7FFF
64K-128K EPROM/Flash CONFIGURATION
This requires the use of a 64K-128K EPROM/Flash and disables the shared program/data memory area. Set the jumpers as shown
below:
1 2 3 4 5 6
JP1 o-o o-o o o
0000 8000 FFFF
PROGRAM MEMORY
64K-128K EPROM/Flash
P5.0=0 DEVICE ADDRESS 0:0000-0:FFFF
P5.0=1 DEVICE ADDRESS 1:0000-1:FFFF
EXTERNAL RAM EXTERNAL RAM
P5.1=0 MEMORY MAPPED I/O 32K RAM: ADDRESS 8000-FFFF
P5.1=1 128K RAM ACCESS 128K RAM:
P5.0=0 DEVICE ADDRESS 0:0000-0:7FFF P5.0=0 DEVICE ADDRESS 0:8000-0:FFFF
P5.0=1 DEVICE ADDRESS 1:0000-1:7FFF P5.0=1 DEVICE ADDRESS 1:8000-1:FFFF