AT91RM9200-QI-002 Atmel, AT91RM9200-QI-002 Datasheet - Page 193

• Manufacturer Part Number: AT91RM9200-QI-002
• Description: IC ARM9 MCU 208 PQFP
• Manufacturer: Atmel
• Series: AT91SAMr

Specifications of AT91RM9200-QI-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: 208-MQFP, 208-PQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -

19. SDRAM Controller (SDRAMC)
19.1
1768I–ATARM–09-Jul-09
Overview
The SDRAM Controller (SDRAMC) extends the memory capabilities of a chip by providing
the interface to an external 16-bit or 32-bit SDRAM device. The page size supports ranges
from 2048 to 8192 and the number of columns from 256 to 2048. It supports byte (8-bit),
half-word (16-bit) and word (32-bit) accesses.
The SDRAM Controller supports a read or write burst length of one location. It does not
support byte Read/Write bursts or half-word write bursts. It keeps track of the active row
in each bank, thus maximizing SDRAM performance, e.g., the application may be placed
in one bank and data in the other banks. So as to optimize performance, it is advisable to
avoid accessing different rows in the same bank.
Features of the SDRAMC are:
• Numerous Configurations Supported
• Programming Facilities
• Energy-saving Capabilities
• Error Detection
• SDRAM Power-up Initialization by Software
• Latency is Set to Two Clocks (CAS Latency of 1, 3 Not Supported)
• Auto Precharge Command Not Used
– 2K, 4K, 8K Row Address Memory Parts
– SDRAM with Two or Four Internal Banks
– SDRAM with 16- or 32-bit Data Path
– Word, Half-word, Byte Access
– Automatic Page Break When Memory Boundary Has Been Reached
– Multibank Ping-pong Access
– Timing Parameters Specified by Software
– Automatic Refresh Operation, Refresh Rate is Programmable
– Self-refresh and Low-power Modes Supported
– Refresh Error Interrupt
AT91RM9200
193