S82433NX View Datasheet(PDF) - Intel

Part Name

Description

Manufacturer

S82433NX

LOCAL BUS ACCELERATOR (LBX)

Intel 

82433LX 82433NX

290478 – 2

NOTES

1 CPU-to-Memory Posted Write Buffer This buffer is 4 Qwords deep enabling the Pentium processor to write back a

whole cache line in 4-1-1-1 timing a total of 7 CPU clocks

2 PCI-to-Memory Posted Write Buffer A PCI master can post two consecutive sets of 4 Dwords (total of one cache

line) or two single non-consecutive transactions

3 PCI-to-Memory Read Prefetch Buffer A PCI master to memory read transaction will cause this prefetch buffer to

read up to 4 Qwords of data from memory allowing up to 8 Dwords to be read onto PCI in a single burst transaction

4 CPU-to-PCI Posted Write Buffer The Pentium processor can post up to 4 Dwords into this buffer The TRDY

connect option allows zero-wait state burst writes to PCI making this buffer especially useful for graphic write

operations

5 CPU-to-PCI Read Prefetch Buffer This prefetch buffer is 4 Dwords deep enabling faster sequential Pentium proc-

essor reads when targeting PCI

Figure 1 Simplified Block Diagram of the LBX Data Buffers

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