Datasheet

33. External Bus Interface

33.1 Description

The External Bus Interface (EBI) is designed to ensure the successful data transfer between several external devices

and the embedded Memory Controller of an ARM-based device.

The Static Memory and SDRAM Controllers are all featured external Memory Controllers on the EBI. These external

Memory Controllers are capable of handling several types of external memory and peripheral devices, such as

SRAM, PROM, EPROM, EEPROM, Flash, and SDR-SDRAM. The EBI operates with a 1.8V or 3.3V power supply

Note: SAMV7x operates at 3.3V only.

The EBI also supports the NAND Flash protocols through integrated circuitry that reduces the requirements for

external components. Additionally, the EBI handles data transfers with up to six external devices, each assigned to

six address spaces defined by the embedded Memory Controller. Data transfers are performed through a 16-bit or

32-bit data bus, an address bus of up to 24 bits, up to four chip select lines (NCS[3:0]) and several control pins that

are generally multiplexed between the different external Memory Controllers.

33.2 Embedded Characteristics

• Integrates two External Memory Controllers

– Static Memory Controller

– SDR-SDRAM Controller

• Integrates NAND Flash Logic

• Up to 24-bit Address Bus (up to 16 Mbytes linear per chip select)

• Up to four Chip Selects, Configurable Assignment

– Static Memory Controller on NCS0, NCS1, NCS2, NCS3

– SDR-SDRAM Controller (SDCS) or Static Memory Controller on NCS1

– NAND Flash support on NCS0, NCS1, NSCS2 and NCS3

SAM E70/S70/V70/V71 Family

External Bus Interface

echnology Inc.

Datasheet

DS60001527D-page 382