AN2492 Freescale Semiconductor / Motorola, AN2492 Datasheet - Page 5

• Manufacturer Part Number: AN2492
• Description: MPC184 Descriptor Programmers Guide--PCI View
• Manufacturer: Freescale Semiconductor / Motorola

of the MPC184 Security Co-Processor User’s Manual, PCI Interface, however, the mode register for each
EU is provided in this section for convenience.
4.1 PKEU Mode Register
This register specifies the internal PKEU routine to be executed. For the root arithmetic routines, PKEU has
the capability to perform arithmetic operations on subsegments of the entire memory. This is particularly
useful for operations such as ECDH (elliptic curve Diffie-Hellman) key agreement computation. By using
regAsel and regBsel, for example, parameter memory A subsegment 2 can be multiplied into parameter
memory B subsegment 1. Figure 4 and Figure 5 detail two definitions.
Table 3 lists mode register routine definitions. Parameter memories are referred to for the base address, as
shown.
MOTOROLA
Reset
Reset
Reset
Reset
Field
Field
Field
Field
Addr
Addr
Addr
Addr
R/W
R/W
R/W
R/W
31
31
31
31
MPC184 Descriptor Programmer’s Guide— PCI View
Freescale Semiconductor, Inc.
Figure 4. PKEU Mode Register: Definition 1
Figure 5. PKEU Mode Register: Definition 2
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Go to: www.freescale.com
Reserved
Reserved
0
0
PKEU 0x10000
PKEU 0x10004
PKEU 0x10000
PKEU 0x10004
Reserved
Reserved
R/W
R/W
R/W
R/W
0
0
Execution Unit Mode Data
7
7
6
6
Mode
0
4
Mode
0
3
regsel
0
0
0
0
0
5