Table of Contents
Advertisement
specific memory range while obtaining maximum system performance in the
remaining memory ranges. See "To assign memory map terms" later in this
chapter.
To enable one wait state for emulation memory
In the MC68020 emulator, emulation memory doesn't require any wait states
for clock speeds under 25 MHz. One wait state is needed when the clock speed
is above 25 MHz (except for the dual-port memory, which will run at 33 MHz
without wait states).
The MC68030/EC030 emulator always requires one wait state for synchronous
and burst memory accesses to emulation memory. When the clock speed is
above 25 MHz, the emulator must add a wait state for synchronous and burst
mode accesses to target system memory.
• Answer the question:
Is speed of external clock faster than 25 MHz?
yes
for clock speeds above 25 MHz. (This is the default.) This
ensures that emulation memory has enough time to respond
to the memory access. Otherwise, emulator operation will
be erratic.
no
for clock speeds below 25 MHz. Emulation memory
accesses will be made without adding wait states.
To change the memory configuration
Each target system allocates memory and I/O as needed by the application. As
the system design matures, memory locations and requirements may change.
The emulator has flexible memory resources that allow you to configure the
emulator to support your needs. For example, the initial target system design
Chapter 10: Configuring the Emulator
Emulator Configuration Items
299
Advertisement
Table of Contents
