MB86330 Datasheet, PDF (13/46 Pages) Fujitsu Component Limited. – 16-bit Fixed-point DSP

MB86330
s MEMORY SPACE
• Configuration of the memory space
The memory space consists of a data memory space and an instruction memory space. The I/O, ARAM,
BRAM, TABLE, and ERAM (external memory) areas are allocated in the data memory space, while the
instruction memory is allocated in the program memory space. The I/O, TABLE, ERAM (external memory),
ARAM and BRAM areas in the data memory space are, however, assigned a particular data bus. The memory
for any two areas can, therefore, be accessed concurrently during one cycle. What memory is accessed is
determined automatically by an address value.
Addresses allocated for the memories, and their maximum size are determined as follows. Select a memory
size to be allocated in this range.
• Memory space mode
You can select a method for allocating the data memory space and the program memory space by operating
mode. Determine operating mode by mode pins (MOD2, MOD1 and MOD0) as follows.
MOD2
0
MOD1
0
Other than above
MOD0
0
Operating mode
Single chip mode
Disabled
• Memory map for single chip mode
The program for single chip mode (MOD2: 0 = “000”) is operated by the internal program RAM (which externally
downloads a program). Five areas for I/O, ARAM, BRAM, TABLE and ERAM are allocated on the data memory
space, with the instruction memory allocated on a program memory space completely different from the data
memory space. Although the instruction memory can have an independent address space for 64 kwords,
therefore, you cannot access data in the instruction memory using a program.
• Single chip mode (MOD2: 0 = “000”)
0000H
Data memory area
I/O area
1000H
ARAM area
2000H
BRAM area
3000H
TABLE area
7000H
8000H
Instruction memory space
0000H
4000H
Emulation work area
4100H
Internal instruction
memory for the user
ERAM area
FFFFH
16 bits
FFFFH
16 bits
: The hatched area cannot be used by the user.
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