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TA235 Fiches technique(PDF) 4 Page - STMicroelectronics

No de pièce TA235
Description  TECHNICAL ARTICLE
Download  6 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TA235 Fiches technique(HTML) 4 Page - STMicroelectronics

  TA235 Datasheet HTML 1Page - STMicroelectronics TA235 Datasheet HTML 2Page - STMicroelectronics TA235 Datasheet HTML 3Page - STMicroelectronics TA235 Datasheet HTML 4Page - STMicroelectronics TA235 Datasheet HTML 5Page - STMicroelectronics TA235 Datasheet HTML 6Page - STMicroelectronics  
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TA 235
4/6
AI03411
tCLAX
tCHAX
tWHDX
tDVWH
VALID SRD
A0-A10
G
DQ0-DQ7
RC
tCHWH
tWHRL
C1
W
RP
tPHWL
R1
tAVCL
tAVCH
R2
C2
tWLWH
tWHWL
RB
VPP
tVPHWH
tWHGL
tQVVPL
DIN1
DIN2
Write erase or
program setup
Write erase confirm or
valid address and data
Automated erase
or program delay
Read Status
Register Data
Ready to write
another command
tWLCH
The A/A Mux Interface bus operation is similar to
a standard flash programming protocol with the
exception that addressing is latched using the
Row/Column Select inputs. The lower address
signals (A0–A10) determine the Row Address bits
and
the
higher
address
signals
(A11-A18)
determine the Column Address bits. Figure 5
shows the Address/Address Multiplexed Interface
Read Protocol, and Figure 6 the Address/Address
Multiplexed Interface Write Protocol.
Firmware Security
Intel plans to add new security and software
functions to their chip-sets in a move that will boost
the profile of its future processors for the
multimedia and electronic markets. These are the
key features of the FWH that is basically a flash
with locks on its read and write capabilities that
can be opened using a cryptographic protocol.
The
hardware
security
functions
include
a
cryptographic
engine
to
authenticate
‘digital
certificates’ which Intel or a third party could load
in. The FWH could hold multiple certificates, each
able to grant specific features and ensure a
software program licensed to one user could not
be copied and run on another machine. In
addition, the certificates will act as unique serial
numbers, identifying a given machine in any
Internet or corporate network transaction.
Appendix 1
The Firmware Hub comes in two standard
packages of 32 pins PLCC (as shown in Figure 7)
and 40 pins TSOP (as shown in Figure 8).
References
1. Intel’s security plans raise fear from PC build-
ers, Rick Boyd-Merritt & Mark Carroll, EDTN
News, 15 Dec 1998.
Figure 6. Address/Address Multiplexed Interface Write Protocol


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