Relationship Between Data Bus Width And Control Signals - Fujitsu MB91150 Series Hardware Manual

4.4.1 Relationship Between Data Bus Width and Control
Signals
Control signals WR0 and WR1 always correspond to byte positions of the data bus in a
one to one relationship regardless of whether the mode is big-endian or little-endian,
and regardless of the data bus width.
The following figure shows the byte positions for the data bus of the MB91150 to be
used with the set data bus width for each bus mode.
I Relationship between data bus width and control signals
The following figure shows the byte positions on the data bus of the MB91150 to be used with
the set data bus width for each bus mode.
Figure 4.4-1 Data bus width and control signals for a normal bus interface
(a) 16-bit bus
data bus
D31
D16
(b) 8-bit bus
Control signals data bus
D31
WR0
D24
WR1
CHAPTER 4 BUS INTERFACE
Control signals
WR0
(D23 to D16 are not used.)
115