AT91RM9200-CI-002 Atmel, AT91RM9200-CI-002 Datasheet - Page 133

• Manufacturer Part Number: AT91RM9200-CI-002
• Description: IC ARM9 MCU 256 BGA
• Manufacturer: Atmel
• Series: AT91SAMr

Specifications of AT91RM9200-CI-002

• Core Processor: ARM9
• Core Size: 16/32-Bit
• Speed: 180MHz
• Connectivity: EBI/EMI, Ethernet, I²C, MMC, SPI, SSC, UART/USART, USB
• Peripherals: POR
• Number Of I /o: 122
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: ROM
• Ram Size: 48K x 8
• Voltage - Supply (vcc/vdd): 1.65 V ~ 1.95 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 256-BGA
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -

17. External Bus Interface (EBI)
17.1
1768I–ATARM–09-Jul-09
Overview
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, SDRAM and Burst Flash Controllers are all featured external Memory Control-
lers 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,
SDRAM and Burst Flash.
The EBI also supports the CompactFlash and the NAND Flash/SmartMedia protocols via inte-
grated circuitry that greatly reduces the requirements for external components. Furthermore, the
EBI handles data transfers with up to eight external devices, each assigned to eight 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 26 bits, up to eight chip select lines (NCS[7:0])
and several control pins that are generally multiplexed between the different external Memory
Controllers.
Features of the EBI are:
Note:
• Integrates Three External Memory Controllers:
• Additional Logic for NAND Flash/SmartMedia and CompactFlash Support
• Optimized External Bus:
• Configurable Chip Select Assignment:
– Static Memory Controller
– SDRAM Controller
– Burst Flash Controller
– 16- or 32-bit Data Bus
– Up to 26-bit Address Bus, Up to 64 Mbytes Addressable
– Up to 8 Chip Selects, Each Reserved for one of the Eight Memory Areas
– Optimized Pin Multiplexing to Reduce Latencies on External Memories
– Burst Flash Controller or Static Memory Controller on NCS0
– SDRAM Controller or Static Memory Controller on NCS1
– Static Memory Controller on NCS3, Optional NAND Flash/SmartMedia Support
– Static Memory Controller on NCS4 - NCS6, Optional NAND Flash/SmartMedia and
– Static Memory Controller on NCS7
CompactFlash Support
1. The 32-bit Data Bus is for SDRAM only.
(1)
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