CHAPTER 2 NAMES AND FUNCTIONS OF COMPONENTS
User’s Manual U14700EJ2V0UM
30
2.5.2
Cautions related to emulation memory
(1)
Number of data waits required for emulation memory access
The number of data waits required to be inserted for emulation memory access varies depending on the
operating frequency of the emulator.
4 MHz
≤
Operating frequency
<
25 MHz
0 waits
25 MHz
≤
Operating frequency
≤
40 MHz
1 wait
40 MHz
<
Operating frequency
2 waits
(2)
Bus sizing
Make the bus sizing 16 bits (set BSC register BSn0 to 1).
An 8-bit bus cannot be used.
(3)
WAIT pin
The number of data waits for the emulation memory is not affected by the WAIT pin.
(4)
Address wait
Address waits cannot be inserted in the emulation memory.
When address waits need to be inserted, set as follows.
This setting is effective to make the access speed to the emulation memory equal to that of the external memory
or external I/O to measure the performance, etc.
For how to insert waits in the emulation memory, refer to
2.5.1 Wait setting for emulation memory
.
Number of data waits for CS
space of emulation memory
Number of address waits for
external memory or external I/O
Number of data waits for
external memory or external I/O
=
+
