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3 System Board (P/Ns D3657-63001 and D3661-63001)
Principal Components and Features
PCI, Cache and Memory Controller (SB82437FX-66)
The SB82437FX-66 device integrates cache and memory control functions
and provides bus control functions for the transfer of information between
the microprocessor, cache, main memory and the PCI bus. The cache
controller supports the Pentium Cache Write-Back mode and 256 KB of
direct mapped, write-back level-two cache, using synchronous pipeline
burst SRAMs.
SB82437FX-66 Feature Summary
Function Features
Cache controller ❒ Direct mapped organization
❒ Buffered write-back
❒ External cache tags
❒ 32-byte line size
❒ Uses synchronous pipeline burst SRAM
❒ Supports 3-1-1-1
1
burst reads
Write buffer ❒ Buffers all processor writes to main memory
❒ Buffers memory writes to PCI for selected memory regions
❒ Supports 3-1-1-1
1
write access timing
DRAM controller ❒ Uses dedicated DRAM memory address and data buses
❒ Page mode - one or two pages open simultaneously
❒ Supports pipelined accesses
❒ Full RAS/CAS programmability
❒ Flexible bank configurations (each bank programmable for
DRAM size, bank width and single or double-sided modules)
❒ Self configuring bank start addresses
❒ Shadow RAM support for the memory region 640 KB - 1 MB
(in 16-KB segments)
❒ System management memory support
❒ RAS only refresh
❒ Fast memory access 7-2-2-2
1
with Extended Data Out (EDO)
memory
PCI slave interface ❒ Becomes processor (local) bus master to generate DRAM
requests on behalf of other PCI bus masters
❒ Supports PCI bus burst cycles
❒ Supports posted writes to DRAM for PCI burst writes
❒ Supports read-ahead from DRAM for PCI burst reads