K60P100M100SF2RM Datasheet, PDF (773/1809 Pages) Freescale Semiconductor, Inc – K60 Sub-Family Reference Manual

Chapter 32 Memory-Mapped Cryptographic Acceleration Unit (MMCAU)
• Any MMCAU reference using a non-0-modulo-4 byte address (addr[1:0] ≠ 00)
generates an error termination.
• For MMCAU writes:
• Only the first 64 bytes of the 2-Kbyte direct write address space can be
referenced. Attempting to access regions beyond the first 64 bytes terminates
with an error.
• The second 2-Kbyte space defines the indirect address-as-command region and
any reference in this space is allowed by the MMCAU.
NOTE
The CAU contains error logic to detect any illegal
command sent to it. Accordingly, there are address
values in this upper 2 Kbyte region of the address
space that are passed to the CAU, and then detected as
illegal commands. If the CAU detects an illegal
command, it sets the CASR[IC] flag and performs no
operation.
• For MMCAU reads:
• Any attempted read from the first 2-Kbyte region of the address space (an
attempted direct read) is illegal and produces an error termination.
• Within the second 2-Kbyte region (addr[11] = 1) of the address space, only a 64-
byte space is treated as a legal CAU store operation. The allowable addresses are
defined as:
addr[11:0] = 1000_10xx_xx_00
where the 4-bit xxxx value specifies the CAU register number. The CAU
supports a subset of the allowable register numbers (0x0 - 0xA). Attempting a
store of a reserved (unsupported) register produces an undefined result.
32.6.2.2 Data Integrity Checks
Direct writes can send 1, 2, or 3 commands to the CAU in a single 32-bit transfer. As
shown in Figure 32-16, the commands include a valid bit located at bits 31, 20, and 9 of
the write data where:
• Bit 31 is the valid bit for the first command
• Bit 20 is the valid bit for the second command
• Bit 9 is the valid bit for the third command
The direct write data check validates the combination of these three valid bits. The
following are the three legal states associated with these bits:
K60 Sub-Family Reference Manual, Rev. 6, Nov 2011
Freescale Semiconductor, Inc.
773