Relationship Between Data Bus Widths And Control Signals - Fujitsu FR60 Hardware Manual

4.4.1 Relationship Between Data Bus Widths and Control
Signals
There is a one-to-one correspondence between the
location of the bytes on the data bus regardless of the data bus width.
This section summarizes the location of the bytes on the data bus used for the specified
data bus width and the corresponding control signal for each bus mode.
■ Control Signals on the Ordinary Bus Interface
Figure 4.4-1 shows the 16-bit bus width and 8-bit bus width control signals on the ordinary bus interface.
■ Control Signals on the Time Division I/O Interface
Figure 4.4-2 shows the 16-bit bus width and 8-bit bus width control signals on the time division I/O interface.
Figure 4.4-2 Control Signals on the Time Division I/O Interface
a) 16-bit bus width
Data bus
D31
D16
Figure 4.4-1 Control Signals on the Ordinary Bus Interface
a) 16-bit bus width
Data bus Control signal
WR0
WR1
Control signal
Output address
A15 to 8 WR0
A7 to 0 WR1
- -
- -
[3:0] control signals and the
WR
b) 8-bit bus width
Control signal
Data bus
WR0
(D23 to D16 are not used.)
b) 8-bit bus width
Output address
Data bus
-
-
-
-
-
Control signal
A7 to 0 WR0
- -
- -
- -
(D23 to 16 are not used)
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