Atmel Xplained Evaluation Board AT32UC3A3-XPLD AT32UC3A3-XPLD 데이터 시트

32072H–AVR32–10/2012

Figure 14-3. CompactFlash Read/Write Control Signals

 and 

 illustrate the multiplexing of the CompactFlash

logic signals with other EBI signals on the EBI pins. The EBI pins in 

 are

strictly dedicated to the CompactFlash interface as soon as the HMATRIX.SFR6.CS4A and/or
HMATRIX.SFR6.CS5A bits is/are written. These pins must not be used to drive any other mem-
ory devices.

The EBI pins in 

 remain shared between all memory areas when the cor-

responding CompactFlash interface is enabled (CS4A = 1 and/or CS5A = 1).

CompactFlash Mode Selection

Attribute Memory

I/O Mode (Write operations)

Common Memory

NRD_NOE

NWR0_NWE

1

I/O Mode (Read operations)

1

1

NRD_NOE

A22

A23

SMC

NRD

NWR0/NWE

Compact Flash Logic

EBI

1
1

1

0

0

1

1

0

1

CFNOE

CFNWE

CFNIORD

Dedicated CompactFlash Interface Multiplexing

Pins

NCS[4]

CFCS0

NCS[4]

NCS[5]

CFCS1

NCS[5]