Motherboard Description
SY-7VDA
10
1-8
MEMORY
1-8.1 Main Memory
The motherboard has three DDR DIMM sockets. DDR RAM can be
installed in one, two, or three sockets. Using the serial presence detect
(SPD) data structure, programmed into an E²PROM on the DDR DIMM,
the BIOS can determine the DDR RAM’s size and speed. Minimum DDR
DIMM memory size is 64 MB; maximum DDR DIMM memory size is
256/512 MB. Memory size and speed can vary between sockets.
The motherboard supports the following memory features:
−
DRAM interface synchronous with host CPU (66/100/133 MHz) or
AGP (66MHz) for most flexible configuration
−
DRAM interface may be faster than CPU by 33 MHz to allow use of
PC1600/2100 memory modules with 66MHz
Celeron or use of PC1600/2100 with 100MHz Pentium II or Pentium III
−
Concurrent CPU, AGP, and PCI access
−
Supports DDR RAM memory types only
−
Flexible row and column addresses. 64-bit data width only
−
2.5V SSTL-2 DRAM interface for DDR RAM
−
Optional bank-by-bank ECC (single-bit error correction and multi-bit
error detection) or EC (error checking only) for DRAM integrity
−
Supports maximum 16-bank interleave (i.e., 16 pages open
simultaneously); banks are allocated based on LRU
−
Independent DDR RAM control for each bank
−
Seamless DRAM command scheduling for maximum DRAM bus
utilization (e.g., precharge other banks while accessing the current bank)
−
Four cache lines (16 quadwords) of CPU to DRAM write buffers
−
Four cache lines of CPU to DRAM read prefetch buffers
−
Read around write capability for non-stalled CPU read
−
Speculative DRAM read before snoop result
−
Burst read and write operation
−
x-1/2-1/2-1/2-1-1/2-1/2-1/2 back-to-back accesses for DDR SDRAM
Summary of Contents for SY-7VDA
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