Preliminary
PowerNP NPe405L Embedded Processor Data Sheet
SDRAM Memory Controller
The NPe405L Memory Controller provides a low latency access path to SDRAM memory. The memory
controller supports four logical banks. Up to 256MB per bank are supported, for a maximum of 1GB total.
Memory access and refresh timing, address and bank sizes, and memory addressing modes are
programmable.
Features include:
• 11x8 to 13x11 row-column address modes (2- and 4-bank devices supported)
• Memory bus operates at same frequency as PLB
• 32-bit memory interface support
• Programmable address range for each bank of memory
- 4GB address space
• Industry standard 168-pin DIMMS are supported (some configurations)
• 200 MHz NPe405H supports up to 100 MHz memory with PC100 support
• 266 MHz NPe405H supports up to 133 MHz memory with PC133 support
• 4MB to 256MB per bank
• Programmable timing
• Auto refresh
• Page Mode Accesses with up to 4 open pages
• Power Management (self-refresh)
• Error Checking and Correction (ECC) support
- Standard single error correct, double error detect coverage
- Aligned nibble error detect
- Address error logging
External Bus Controller (EBC)
• Supports four ROM, EPROM, SRAM, Flash, and Slave Peripheral I/O banks supported
• Up to 66.66MHz operation
• Burst and non-burst devices
• 8-, 16-bit byte-addressable data bus width support
• Latch data on Ready, Synchronous or Asynchronous
• Programmable 2K clock-cycle time-out counter with disable for Ready
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AMCC [ APPLIED MICRO CIRCUITS CORPORATION ]
