Cryptographic Acceleration Unit (CAU)
MCF52235 ColdFire® Integrated Microcontroller Reference Manual, Rev. 6
Freescale Semiconductor
5-3
5.2.1
CAU Status Register (CASR)
CASR contains the status and configuration for the CAU.
5.2.2
CAU Accumulator (CAA)
CAU commands use the CAU accumulator for storage of results and as an operand for the cryptographic
algorithms.
Register
code:
0x0 (CASR)
Access: Read/write
via CAU commands
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
R
VER
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
DPE IC
W
Reset 0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Figure 5-2. CAU Status Register (CASR)
Table 5-2. CASR Field Descriptions
Field
Description
31–28
VER
CAU version. Indicates CAU version
0x1 Initial CAU version (This is the value on this device)
0x2 Second version, added support for SHA-256 algorithm
27–2
Reserved, must be cleared.
1
DPE
DES parity error.
0 No error detected
1 DES key parity error detected
0
IC
Illegal command. Indicates an illegal instruction not found in
Section 5.3.3, “CAU Commands,”
has been executed.
0 No illegal commands issued
1 Illegal coprocessor command issued
Register
code:
0x1 (CAA)
Access: Read/write
via CAU commands
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
R
ACC
W
Reset 0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Figure 5-3. CAU Accumulator Register (CAA)
Table 5-3. CAA Field Descriptions
Field
Description
31–0
ACC
Accumulator. Stores results of various CAU commands.
Because
of
an
order
from
the
United
States
International
Trade
Commission,
BGA-packaged
product
lines
and
part
numbers
indicated
here
currently
are
not
available
from
Freescale
for
import
or
sale
in
the
United
States
prior
to
September
2010:MCF52234CVM60,
MCF52235CVM60
