Freescale Semiconductor MCF5480 - Manual (Page 688)

MCF548x Reference Manual, Rev. 3
22-86 Freescale Semiconductor
Table 22-80 lists several different descriptors that use the format shown in Table 22-79 .
Table 22-81 shows the middle descriptor for a statically assigned AESU.
Table 22-82 lists several different descriptors that use the middle descriptor format shown in Table 22-81 .
PTR_7 MAC Out Pointer NULL
PTR_NEXT Next Descriptor Pointer Pointer to next data packet descriptor
Table 22-80. Typical Header Values for Using First Static AESU Descriptor Format
Header Value Mode E/D
0x6030010 CBC Encrypt
0x60200010 CBC Decrypt
0x6010010 ECB Encrypt
0x60000010 ECB Decrypt
0x60600010 CTR —
Table 22-81. Middle Descriptor for a Statically Assigned AESU
Field Name Value/Type Description
Header see Table 22-82 Header common to several descriptors (TYPE 0001)
LEN_1 Length (not used) NULL
PTR_1 Pointer (not used) NULL
LEN_2 IV Length NULL
PTR_2 IV Pointer NULL
LEN_3 Key Length NULL
PTR_3 Key Pointer NULL
LEN_4 Data In Length Number of bytes of data to be ciphered (multiple of 16)
PTR_4 Data In Pointer Address of data to be ciphered
LEN_5 Data Out Length Bytes of output data (should be equal to length of data in)
PTR_5 Data Out Pointer Address to write output data
LEN_6 IV Out Length NULL
PTR_6 IV Out Pointer NULL
LEN_7 MAC Out Length NULL
PTR_7 MAC Out Pointer NULL
PTR_NEXT Next Descriptor Pointer Pointer to next data packet descriptor
Table 22-79. First Descriptor for a Statically Assigned AESU (Continued)
Field Name Value/Type Description