參數(shù)資料
型號(hào): CA95C09-33CT
元件分類: 加密電路
英文描述: TELECOM, DATA ENCRYPTION CIRCUIT, PQFP44
封裝: TQFP-44
文件頁數(shù): 28/42頁
文件大?。?/td> 180K
代理商: CA95C09-33CT
CA95C68/18/09
Tundra Semiconductor Corporation
3-58
Tundra Semiconductor Corporation
CBC and CFB Operation
The instruction sequence to perform CBC or CFB operation
in Direct Control Mode (DCM) is similar to ECB mode of
operation. When operating in these modes, the C/K pin must
be programmable because the IV needed for CBC and CFB
can only be loaded while in Multiplexed Control Mode. If
you are using CFB-1 ciphering, the Mask Register must also
be loaded before entering DCM. When operating in this
mode you must ensure that a Stop command is not issued
while the Command Pending or Busy pins are active, or
when there is data still remaining in the Output Register. (see
Figure 3-21 for a programming ow chart).
Figure 3-21 : Direct Control Mode CBC/CFB
Programming Flow Chart
RESET
PROGRAM MODE
REGISTER
CFB-1
MODE
?
LOAD
MASK REGISTER
PROGRAM
C / K LOW
ENTER DATA
IS
OUTPUT FLAG
ACTIVE
?
REMOVE DATA
ENTER
STOP COMMAND
AT
END OF
SESSION
?
SET UP FOR
KEY ENTRY
YES
NO
YES
NO
YES
NO
YES
NO
DOES
CP = LOW
( AUX3 )
?
PROGRAM
C / K = HIGH
ENTER
START COMMAND
LATCH THE
INPUT / OUTPUT
REGISTER
ADDRESS
LOAD CLEAR
IVE / IVD
USE DCM TO
LOAD KEYS
?
PROGRAM
C / K = HIGH
SET UP FOR
KEY ENTRY
NO
YES
LOAD KEYS
DOES
CP = LOW
( AUX3 )
?
YES
LOAD KEYS
IS
INPUT FLAG
ACTIVE
?
NO
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