SAM3A8C Atmel Corporation, SAM3A8C Datasheet - Page 436

• Manufacturer Part Number: SAM3A8C
• Manufacturer: Atmel Corporation

Figure 26-3.
26.9
26.9.1
26.9.2
436
436
Connection to External Devices
SMC
SAM3X/A
SAM3X/A
Data Bus Width
Byte Write or Byte Select Access
Memory Connections for External Devices
NCS[0] - NCS[7]
A[23:0]
D[15:0]
NWE
NRD
A data bus width of 8 or 16 bits can be selected for each chip select. This option is controlled by
the field DBW in SMC_MODE (Mode Register) for the corresponding chip select.
Figure 26-4
connect a 512K x 16-bit memory on NCS2.
Each chip select with a 16-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.
Figure 26-4.
shows how to connect a 512K x 8-bit memory on NCS2.
Memory Connection for an 8-bit Data Bus
SMC
NCS[2]
A[18:2]
D[7:0]
NWE
NRD
A0
A1
8 or 16
NCS0
NCS1
NCS2
Memory Enable
Output Enable
Write Enable
A[25:0]
D[15:0] or D[7:0]
NCS3
Memory Enable
NCS4
NCS5
Memory Enable
Memory Enable
NCS6
Memory Enable
NCS7
D[7:0]
A[18:2]
Write Enable
Output Enable
Memory Enable
A0
A1
Memory Enable
Memory Enable
Figure 26-5
Memory Enable
11057A–ATARM–17-Feb-12
11057A–ATARM–17-Feb-12
shows how to