Motherboard Description
SY-7VBA133U
9
1-8 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 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 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 100 MHz Pentium II or Pentium III)
Concurrent CPU, AGP, and PCI access
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 systems
Mixed 1M / 2M / 4M / 8M / 16M / 32MxN DRAMs
Pinouts 3 DIMMs at 133 MHz for 1.5 GB 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
Dual copies of MA signals for improved drive
Optional bank-by-bank ECC (single-bit error correction and
multi-bit error detection) or EC (error checking only) for DRAM
integrity
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