AT91SAM9G10-EK Atmel, AT91SAM9G10-EK Datasheet - Page 161

• Manufacturer Part Number: AT91SAM9G10-EK
• Description: KIT DEV FOR SAM9G10 ARM
• Manufacturer: Atmel
• Type: MCUr

Specifications of AT91SAM9G10-EK

• Contents: Board, Cables, Power Supply
• Silicon Manufacturer: Atmel
• Core Architecture: AVR
• Kit Contents: Board
• Svhc: No SVHC (15-Dec-2010)
• Mcu Supported Families: AT91SAM9G10, ARM926EJ-S
• Tool / Board Applications: Microcontroller
• Rohs Compliant: Yes
• For Use With/related Products: *
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

22.6
Figure 22-2.
22.7
22.7.1
22.7.2
6462A–ATARM–03-Jun-09
External Memory Mapping
Connection to External Devices
Data Bus Width
Byte Write or Byte Select Access
SMC
Memory Connections for Eight External Devices
NCS[0] - NCS[7]
D[31:0]
A[25:0]
NWE
NRD
The SMC provides up to 26 address lines, A[25:0]. This allows each chip select line to address
up to 64 Mbytes of memory.
If the physical memory device connected on one chip select is smaller than 64 Mbytes, it wraps
around and appears to be repeated within this space. The SMC correctly handles any valid
access to the memory device within the page (see
A[25:0] is only significant for 8-bit memory, A[25:1] is used for 16-bit memory, A[25:2] is used for
32-bit memory.
A data bus width of 8, 16, or 32 bits can be selected for each chip select. This option is con-
trolled by the field DBW in SMC_MODE (Mode Register) for the corresponding chip select.
Figure 22-3
connect a 512K x 16-bit memory on NCS2.
as a single 32-bit memory
Each chip select with a 16-bit or 32-bit data bus can operate with one of two different types of
write access: byte write or byte select access. This is controlled by the BAT field of the
SMC_MODE register for the corresponding chip select.
shows how to connect a 512K x 8-bit memory on NCS2.
8 or 16 or 32
NCS0
NCS1
Figure 22-5
NCS2
A[25:0]
Memory Enable
Output Enable
Write Enable
D[31:0] or D[15:0] or
D[7:0]
NCS3
Memory Enable
Figure
NCS4
Memory Enable
NCS5
shows two 16-bit memories connected
NCS6
Memory Enable
22-2).
NCS7
Memory Enable
Memory Enable
Memory Enable
AT91SAM9G10
Figure 22-4
Memory Enable
shows how to
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