Fujitsu FR81S User Manual
CHAPTER 36: EXTERNAL BUS INTERFACE
5. Operation
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER : EXTERNAL BUS INTERFACE
FUJITSU SEMICONDUCTOR CONFIDENTIAL
50
5.11. Example of Connecting to Asynchronous Memory
This section shows an example of connecting to asynchronous memory.
This section shows an example of connecting external bus pins to asynchronous memory.
Figure 5-13 Example 1 of Connection to SRAM (8-bit SRAM×2)
Figure 5-14 Example 2 of Connection to SRAM (8-bit SRAM×1)
CS3
X
WE
_
X
RD
X
WR0
X
CS_
X
OE_X
LSI
WE_X
:
Write enable
OE_X
:
Output enable
A17 to A00
A17 to A00
D31 to D24
IO7 to IO0
256
K
8-
bit
S
R
A
M
LSI
CS3 X
CS_X
RD X
OE_X
WR0 X
WE_X
OE_X
CS_X
WR1 X
WE_X
IO7 to IO0
WE_X :
Write enable
OE_X :
Output enable
D23 to D16
D31 to D24
A17 to A00
A17 to A00
A18 to A01
256
K
8-
bit
S
R
A
M
256
K
8-
bit
S
R
A
M
IO7 to IO0
MB91520 Series
MN705-00010-1v0-E
1249