SOYO SY-7VCA user manual Main Memory

Motherboard Description SY-7VCA

1-8 MEMORY

1-8.1 Main Memory

The motherboard has three DIMM sockets. SDRAM can be installed in one, two, or three sockets. Using the serial presence detect (SPD) data structure, programmed into an E²PROM on the DIMM, the BIOS can determine the SDRAM’s size and speed. Minimum DIMM memory size is 8 MB; maximum 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 (66/100/133MHz) or AGP (66MHz) for most flexible configuration

⎯DRAM interface may be faster than CPU by 33 MHz to allow use of PC100 memory modules with 66MHz Celeron or use of PC133 with 100MHz Pentium II or Pentium III

⎯DRAM interface may be slower than CPU by 33 MHz to allow use of older memory modules with newer CPUs (e.g., PC66 memory modules with 100MHz Pentium II or Pentium III)

⎯Concurrent CPU, AGP, and PCI access

⎯Supports FP,EDO, SDRAM, ESDRAM and VCM SDRAM memory types

⎯Different DRAM types may be used in mixed combinations

⎯Different DRAM timing for each bank

⎯Dynamic Clock Enable (CKE) control for SDRAM power reduction in high speed system.

⎯Mixed 1M/2M/4M/8M/16M/32MxN DRAMs

⎯The 7VCA supports 3 DIMMs or 6 banks at 133MHz for 1.5GB max memory.

⎯Flexible row and column addresses

⎯64-bit data width only

⎯3.3V DRAM interface with 5V-tolerant inputs

⎯Programmable I/O drive capability for MA, command, and MD signals

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