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Intel
®
820E Chipset
R
Design Guide 17
FWH Flash BIOS
The FWH Flash BIOS component is a key element in providing a new security and manageability
infrastructure for the PC platform. The device operates under the FWH Flash BIOS interface and
protocol. The hardware features of this device include a unique Random Number Generator (RNG),
register-based locking, and hardware-based locking.
ISA Bridge
For legacy needs, ISA support is an optional feature of the Intel 820E chipset. Implementations that
require ISA support can benefit from the enhancements of the Intel 820E chipset, while “ISA-less”
designs are not burdened with the complexity and cost of the ISA subsystem.
The Intel 820E chipset platform with optional ISA support takes advantage of an external component
supplier’s ISA bridge, which is a PCI-to-ISA bridge that resides on the PCI bus of the ICH2.
1.3.2. Bandwidth Summary
The following table provides a summary of the bandwidth requirements for the Intel 820E chipset.
Table 1. Intel
®
820E Chipset Platform Bandwidth Summary
Interface Clock Speed
(MHz)
Samples
Per Clock
Data Rate
(megasamples/s)
Data Width
(Bytes)
Bandwidth
(MB/s)
Processor bus 100/133 1 100/133 8 800/1066
RDRAM 266/300/356/400 2 533/600/711/800 2 1066/1200/1422/1600
AGP 2.0 66 4 266 4 1066
Hub interface 66 4 266 1 266
PCI 2.2 33 1 33 4 133