Typical
Applications
This section presents some standard implementations of the AT68166FT in application.
When used on a 32-bit (word) application, the module shall be connected as follow :
32-bit mode
application
•
•
•
The 32 lines of data are connected to distinct data lines
The four CSx are connected together and linked to a single host CS output
Each one of the four WEx is connected to a dedicated WE line on the host to allow byte, half
word and word format write.
Figure 12. 32-bit typical application ( 1 SRAM bank)
A
D
AT68166FT
A[19:2]
D[31:0]
CS[3:0]
OE
A[17:0]
RAMS0*
RAMOE0*
RWE[3:0]*
I/O[31:0]
WE[3:0]
TSC695F
A[19:2]
D[31:0]
A[27:0]
D[31:0]
16-bit mode
application
When used on a 16-bit (half word) application, the module can be connected as presented in the
following figure. This allows use of a single AT68166FT part for two SRAM memory banks.
All input controls of the AT68166FT not used in the application shall be pulled-up.
Figure 13. 16-bit typical application (two SRAM banks)
AT68166FT
A
OE
RAMOE[1:0]*
A[18:1]
A[17:0]
D
CS[3:2]
WE[3:2]
RAMS1*
RWE0*
D[31:16]
D[31:16]
I/O[31:16]
I/O[15:0]
CS[1:0]
WE[1:0]
RAMS0*
RWE0*
TSC695F
A[18:1]
D[31:0]
A[27:0]
D[31:0]
8-bit mode
application
When used on a 8-bit (byte) application, the module can be connected as presented in the fol-
lowing figure. This allows use of a single AT68166FT part for up to four SRAM memory banks.
All input controls of the AT68166FT not used in the application shall be pulled-up.
14
AT68166FT
7531H–AERO–04/09
ATMEL [ ATMEL ]
