AT91SAM9R64 Datasheet, PDF (178/911 Pages) ATMEL Corporation – Thumb Microcontrollers

23.4 Application Example
23.4.1 Hardware Interface
Figure 23-1. SMC Connections to Static Memory Devices
D0-D31
A0/NBS0
NWR0/NWE
NWR1/NBS1
A1/NWR2/NBS2
NWR3/NBS3
NCS0
NCS1
NCS2
NCS3
NCS4
NCS5
NCS6
NCS7
128K x 8
D0 - D7
SRAM
D0 - D7
CS
NRD
OE
NWR0/NWE
WE
A0 - A16
A2 - A18
128K x 8
D8-D15
SRAM
D0-D7
CS
NRD
OE
NWR1/NBS1 _WE
A0 - A16 ^{A2 - A18}
A2 - A25
Static Memory
Controller
128K x 8
D16 - D23
SRAM
D0 - D7
CS
NRD
OE
A1/NWR2/NBS2 _WE
A0 - A16 ^{A2 - A18}
128K x 8
D24-D31
SRAM
D0-D7
CS
NRD
OE
NWR3/NBS3 _WE
A0 - A16
A2 - A18
23.5 Product Dependencies
23.5.1 I/O Lines
The pins used for interfacing the Static Memory Controller may be multiplexed with the PIO
lines. The programmer must first program the PIO controller to assign the Static Memory Con-
troller pins to their peripheral function. If I/O Lines of the SMC are not used by the application,
they can be used for other purposes by the PIO Controller.
178 AT91SAM9R64/RL64 Preliminary
6289A–ATARM–15-Jan-08