參數(shù)資料
型號(hào)： INTEL82802AB
廠商： Intel Corp.
英文描述： Firmware Hub (FWH)
中文描述： 固件集線器（固件樞紐）
文件頁(yè)數(shù)： 29/53頁(yè)
文件大小： 471K
代理商： INTEL82802AB
Intel
82802AB/AC Firmware Hub
R
Datasheet
29
4.11.2.
Initializing the RNG Device
Once the RNG device is detected, it must be enabled and should be tested before use.
Step 1:
The RNG Enabled bit (bit 0) of the Hardware Status register must be set to enable the
RNG device.
Step 2:
Once the RNG is enabled, an initial read of the RNG Data register should be made to
clear any preexisting data from the register.
Step 3:
A test (e.g., FIPS 140-1) should be run on the RNG Device. This test will ensure that
there was no error in detecting the device and that the device is functioning properly.
Selecting Appropriate FWH IDs and Densities
4.11.3.
It is possible, using different ID strapping, to use multiple FWH components in a system. While the
FWH protocol supports up to 16 FWH devices, the BIOS support, bus loading or the attaching bridge
may limit this number. Note that, regardless of the number of FWH components, the maximum
“window” of the FWH array visible at one time is 4 MB (for Intel
ICH1) and 8MB for Intel
ICH2. The
boot device must have an ID (as determined by ID [0:3]) of 0. For clarity, it is advisable that subsequent
devices use incremental numbering.
The most straightforward method of using multiple FWH components is to use devices of equal density.
This is the recommended technique.
In special applications, when it is desirable to use multiple FWH components of different densities—if
multiple RNGs or more GPIs are required, for instance, without the need for greater array space—IDs
must be chosen such that component memory array spaces do not cross the boundaries delimited by the
highest-capacity device, as illustrated in the following table.
For example, in a design with 8- and 4-Mbit components, the 8-Mbit part must either be first or must be
after enough 4-Mbit parts to add up to a multiple of 8 Mbits.
Yes
No
Yes
8 Mbits
4 Mbits
4 Mbits
8 Mbits
4 Mbits
4 Mbits
8 Mbits
Biggest is
8 Mbits.
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