82443LX Datasheet, PDF (10/144 Pages) Intel Corporation – INTEL 440LX AGPSET: 82443LX PCI A.G.P. CONTROLLER (PAC)

INTEL 82443LX (PAC)
E
Pentium^® II
Processor
Pentium^® II
Processor
Video
- DVD
- Camera
- VCR
- VMI
- Video Capture
Graphics
Device
A.G.P Bus
Display
Encoder
TV
Video BIOS
Graphics
Local Memory
Host Bus
82443LX
PCI/A.G.P.
Controller
(PAC)
72 Bit
w/ECO
Main
Memory
3.3V EDO &
SDRAM Support
PCI Slots
Primary PCI Bus
(PCI Bus #0)
2 IDE Ports
(Ultra DMA/33)
2 USB USB
Ports _USB
System BIOS
82371SB
(PIIX4)
(PCI-to-ISA
Bridge)
System Mgnt (SM) Bus
IO
APIC
ISA Slots
ISA Bus
SYS_BLK
Figure 1. 440LX System Block Diagram
Host Interface
The Pentium II processor supports a second level cache size of 256K or 512K. All cache control logic is
provided in the Pentium II processor. PAC supports a maximum of 32-bit address or 4-GB memory address
space from the processor perspective. PAC provides bus control signals and address paths for transfers
between the processor’s host bus, PCI bus, Accelerated Graphics Port and main memory. The PAC supports
a 4-deep in-order queue (i.e., it provides support for pipelining of up to four outstanding transaction requests
on the host bus). Due to the system concurrency requirements, along with support for pipelining of address
requests from the host bus, the PAC supports general request queuing for all three interfaces (Host, A.G.P.
and PCI).
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