The AU-MB2200 SDRAM/DDR Controller AMBA Subsystem provides an SDRAM/DDR
Controller peripheral subsystem for AMBA based SOCs. It contains an SDRAM/DDR
Controller that connects seamlessly to the AMBA AHB Bus as an AMBA Bus slave. The
SDRAM/DDR Controller AMBA Subsystem Core is available as a synthesizable Verilog model
from Aurora VLSI, Inc.

SDRAM/DDR Controller
• 32 bit or 64 bit SDRAM/DDR SDRAM data bus
• 4 Mbyte to 4 Gbyte SDRAM/DDR memory system
• Pipelined accesses to active rows for highest performance
• 1, 2, or 4 banks of SDRAM/DDR SDRAMs
• SDRAM/DDR SDRAM powerdown supported
• Fully programmable SDRAM/DDR SDRAM timing parameters
• Auto-refresh with programmable SDRAM/DDR SDRAM refresh interval
• SDRAM
− 2 or 3 cycle CAS latency
− 2 or 4 SDRAM internal banks
− 8, 9, 10, 11, or 12 column address bits
− 11, 12, or 13 row address bits
• DDR
− 2, 2.5, or 3 cycle CAS latency
− 4 DDR SDRAM internal banks
− 9, 10, 11, or 12 column address bits
− 12, 13, or 14 row address bits
AMBA Slave Interface
• AMBA AHB Bus slave
• 32 bit or 64 bit AMBA AHB Bus- user configurable
• Supports all required AMBA AHB Bus features
• Implements AMBA Bus timeout and RETRY response
• Read data prefetching
• Write data packing
• Same cycle device request/response is supported for highest throughput
• Handles all data packing/unpacking and data alignment for data transfer sizes that do
not match the AMBA Bus width and/or SDRAM/DDR SDRAM data bus width
• User configurable for big or little endian AMBA Bus and memory
• AMBA Bus and SDRAM/DDR SDRAM interface can be asynchronous to each other