AT91RM9200-CI-002 Atmel, AT91RM9200-CI-002 Datasheet - Page 123

• 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: -

16.3
16.3.1
16.3.2
1768I–ATARM–09-Jul-09
Functional Description
Bus Arbiter
Address Decoder
The Memory Controller (MC) handles the internal ASB bus and arbitrates the accesses of up to
four masters.
It is made up of:
The Memory Controller handles only little-endian mode accesses. All masters must work in little-
endian mode only.
The Memory Controller has a user-programmable bus arbiter. Each master can be assigned a
priority between 0 and 7, where 7 is the highest level. The bus arbiter is programmed in the reg-
ister MC_MPR (Master Priority Register).
The same priority level can be assigned to more than one master. If requests occur from two
masters having the same priority level, the following default priority is used by the bus arbiter to
determine the first to serve: Master 0, Master 1, Master 2, Master 3.
The masters are:
The Memory Controller features an Address Decoder that first decodes the four highest bits of
the 32-bit address bus and defines 11 separate areas:
• A bus arbiter
• An address decoder
• An abort status
• A misalignment detector
• the ARM920T as the Master 0
• the Peripheral DMA Controller as the Master 1
• the USB Host Port as the Master 2
• the Ethernet MAC as the Master 3
• One 256-Mbyte address space for the internal memories
• Eight 256-Mbyte address spaces, each assigned to one of the eight chip select lines of the
• One 256-Mbyte address space reserved for the embedded peripherals
• An undefined address space of 1536M bytes that returns an Abort if accessed
External Bus Interface
AT91RM9200
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