SiS 648
( North Bridge Chipset )
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First AGP8X supporting Chipset with MuTIOL 1G®
Technology For Pentium® 4 |
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SiS648 HMAC The SiS648 Host & Memory & AGP
Controller integrates a high performance host interface for Intel
Pentium 4 processor, a high performance memory controller, a AGP
interface, and SiS MuTIOL 1G Technology connecting w/ SiS963 MuTIOL
1G Media IO.
The SiS648 Host Interface features the AGTL & AGTL+ compliant bus
driver technology with integrated on-die termination to support
Intel Pentium 4 series processors with FSB 400MHz/533MHz. It
provides a 12-level In-Order-Queue to support maximum outstanding
transactions on host bus up to 12. The host interface plays the role
of processor transactions' dispatcher. It dispatches transactions to
Memory, I/O interface and AGP bus. Transactions to different
destinations can be dispatched concurrently in order to maximum
pipeline efficiency. In addition to dispatching processor's
transactions to corresponding destinations, host interface also
forward DMA transactions from AGP masters and I/O masters to host
bus for snooping, including master interrupt delivery.
The memory controller supports DDR only. It can offer bandwidth up
to 2.7GB/s under DDR333 in order to sustain the bandwidth demand
from host processor, as well as the multi I/O masters and AGP
masters. The Memory Controller mainly comprises the Memory Arbiter,
the M-data/M-Command Queues, and the Memory Interface. The Memory
Arbiter arbitrates a plenty of memory access Host Controller, and
I/O bus masters based on a default optimized priority list with the
capability of dynamically prioritizing the I/O bus master requests
in a bid to offering privileged service to 1) the isochronous
downstream transfer to guarantee the min. latency & timely delivery,
or 2) the PCI master upstream transfer to curb the latency within
the maximum tolerant period of 10us. Prior to the memory access
requests pushed into the M-data queue, any command compliant to the
paging mechanism is generated and pushed into the M-CMD queue. The
M-data/M-CMD Queues further orders and forwards these queuing
requests to the Memory Interface in an effort to utilizing the
memory bandwidth to its utmost by scheduling the command requests in
the background when the data requests streamlines in the foreground.
The memory controller also supports the Suspend to RAM function by
retaining the CKE# pins asserted in ACPI S3 state in which only AUX
source deliver power.
The AGP interface can support external AGP slot with AGP 4X/8X
capability and Fast Write Transactions. A high bandwidth and mature
SiS MuTIOL 1G technology is incorporated to connect SiS648 and
SiS963 MuTIOL 1G Media I/O together. SiS MuTIOL 1G technology is
developed into three layers, the Multi-threaded I/O Link Layer
delivering 1.2GB bandwidth to connect embedded DMA Master devices
and external PCI masters to interface to Multi-threaded I/O Link
layer, the Multi-threaded I/O Packet Layer in SiS963 to transfer
data w/ 1 GB/s bandwidth from/to Multi-threaded I/O Link layer
to/from SiS648, and the Multi-threaded I/O Packet Layer in SiS648 to
transfer data w/ 1 GB/s from/to Multi-threaded I/O Link layer
to/from SiS963.
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Features |
Benefits |
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CPU supported |
Intel Pentium® 4 CPU. |
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DDR333/DDR266/200 support |
Support Maximum Memory Bandwidth 2.7GB/s. |
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MuTIOL 1G® technology |
Proprietary Interconnect between SiS648 and
SiS963.SiS MuTIOL 1G® deliver 1GB/s bandwidth. |
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8X AGP upgrade flexibility |
Make system performance upgrade and user's
facilitation.Support Maximum AGP interface bandwidth 2.1GB/s.Backwards
compatible with AGP 4X. |
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ATA133 enhancement |
Fastest storage support. Increasing
data/file transfer rate. |
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AC97 Controller |
Hollywood 3D stereo enriches audio
surrounding with up to six channels. |
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H/W DVD accelerator with MC, IDCT and VLD
enhancement |
High performance and smooth DVD playback.
H/W accelerator saves CPU utilization. |
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ACR(Advanced Communications Riser) card
support |
Allow multiple configurations on a single
card to extend USB, LAN, HomePNA, modem, and audio for greater
flexibility. Compatible to PCI with minimum design changes.
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Integrated Communication Controller for LAN
or HPNA use |
MII interface used for 10/100Mbps LAN or
1/10Mbps HomePNA function. Reaching cost-effective solution and
design elasticity. |
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Integrated USB2.0 Controllers |
Support Serial Bus Data Rates of 100, 200,
and 400 Mbps. |
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Integrated IEEE 1394 HostController |
Two controllers for six ports, achieving
real legacy free systems. |
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