External Bus Interface Peripheral

EBI (AT91S_EBI) 0xFFFFFF60 (AT91C_BASE_EBI)

Signal	Symbol	PIO controller	Description
A24	(AT91C_PC8_A24 )	PIOC Periph: A Bit: 8	Address Bus[24]
A23	(AT91C_PC7_A23 )	PIOC Periph: A Bit: 7	Address Bus[23]

Function	Description
AT91F_EBI_CfgPIO	Configure PIO controllers to drive EBI signals

EBI Software API (AT91S_EBI)

Offset	Field	Description
0x0	EBI_CSA	Chip Select Assignment Register
0x4	EBI_CFGR	Configuration Register

EBI Register Description

EBI: AT91_REG EBI_CSA Chip Select Assignment Register

EBI AT91C_EBI_CSA 0xFFFFFF60

Offset

Name

Description

EBI_CS0A
AT91C_EBI_CS0A

Chip Select 0 Assignment
0 = Chip Select 0 is assigned to the Static Memory Controller.
1 = Chip Select 0 is assigned to the Burst Flash Controller.

Value	Label	Description
0	EBI_CS0A_SMC AT91C_EBI_CS0A_SMC	Chip Select 0 is assigned to the Static Memory Controller.
1	EBI_CS0A_BFC AT91C_EBI_CS0A_BFC	Chip Select 0 is assigned to the Burst Flash Controller.

EBI_CS1A
AT91C_EBI_CS1A

Chip Select 1 Assignment
0 = Chip Select 1 is assigned to the Static Memory Controller.
1 = Chip Select 1 is assigned to the SDRAM Controller.

Value	Label	Description
0	EBI_CS1A_SMC AT91C_EBI_CS1A_SMC	Chip Select 1 is assigned to the Static Memory Controller.
1	EBI_CS1A_SDRAMC AT91C_EBI_CS1A_SDRAMC	Chip Select 1 is assigned to the SDRAM Controller.

EBI_CS3A
AT91C_EBI_CS3A

Chip Select 3 Assignment
0 = Chip Select 3 is only assigned to the Static Memory Controller and NCS3 behaves as defined by the SMC2.
1 = Chip Select 3 is assigned to the Static Memory Controller and the SmartMedia Logic is activated.

Value	Label	Description
0	EBI_CS3A_SMC AT91C_EBI_CS3A_SMC	Chip Select 3 is only assigned to the Static Memory Controller and NCS3 behaves as defined by the SMC2.
1	EBI_CS3A_SMC_SmartMedia AT91C_EBI_CS3A_SMC_SmartMedia	Chip Select 3 is assigned to the Static Memory Controller and the SmartMedia Logic is activated.

EBI_CS4A
AT91C_EBI_CS4A

Chip Select 4 Assignment
0 = Chip Select 4 is assigned to the Static Memory Controller and NCS4,NCS5 and NCS6 behave as defined by the SMC2.
1 = Chip Select 4 is assigned to the Static Memory Controller and the CompactFlash Logic is activated.

Value	Label	Description
0	EBI_CS4A_SMC AT91C_EBI_CS4A_SMC	Chip Select 4 is assigned to the Static Memory Controller and NCS4,NCS5 and NCS6 behave as defined by the SMC2.
1	EBI_CS4A_SMC_CompactFlash AT91C_EBI_CS4A_SMC_CompactFlash	Chip Select 4 is assigned to the Static Memory Controller and the CompactFlash Logic is activated.

EBI: AT91_REG EBI_CFGR Configuration Register

EBI AT91C_EBI_CFGR 0xFFFFFF64

Offset	Name	Description
0	EBI_DBPUC AT91C_EBI_DBPUC	Data Bus Pull-Up Configuration 0 = D0-D15 Data Bus bits are internally pulled-up to the VDDIOM power supply. 1 = D0-D15 Data Bus bits are not internally pulled-up.
1	EBI_EBSEN AT91C_EBI_EBSEN	Bus Sharing Enable 0 = The External Bus Sharing feature is disabled. 1 = The External Bus Sharing feature is enabled.