Freescale Semiconductor Table 22-24. DISR Field Descriptions (Continued)

MCF548x Reference Manual, Rev. 3
22-38 Freescale Semiconductor
29 OFE Output FIFO error. The DEU output FIFO was detected non-empty upon write of DEU data size
register.
0 No error detected
1 Output FIFO non-empty error
28 IFE Input FIFO error. The DEU input FIFO was detected non-empty upon generation of DONE interrupt.
0 No error detected
1 Input FIFO non-empty error
27 — Reserved
26 IFO Input FIFO Overflow. The DEU input FIFO has been pushed while full.
0 No error detected
1 Input FIFO has overflowed
Note: When operating as a master, the implements flow-control, and FIFO size is not a limit to data
input. When operated as a target, the cannot accept FIFO inputs larger than 512 bytes without
overflowing.
25 OFU Output FIFO Underflow. The DEU output FIFO has been read while empty.
0 No error detected
1 Output FIFO has underflow error
24-22 — Reserved
21 KPE Key Parity Error. Defined parity bits in the keys written to the key registers did not reflect odd parity
correctly. (Note that key register 2 and key register 3 are checked for parity only if the appropriate
DEU mode register bit indicates triple DES. Also, key register 3 is checked only if key size reg = 24.
Key register 2 is checked only if key size reg = 16 or 24.)
0 No error detected
1 Key parity error
20 IE Internal Error. An internal processing error was detected while performing encryption.
0 No error detected
1 Internal error
Note: This bit will be asserted any time an enabled error condition occurs and can only be cleared
by setting the corresponding bit in the interrupt control register or by resetting the DEU.
19 ERE Early Read Error. The DEU IV register was read while the DEU was performing encryption.
0 No error detected
1 Early read error
18 CE Context Error. A DEU key register, the key size register, data size register, mode register, or IV
register was modified while DEU was performing encryption.
0 No error detected
1 Context error
17 KSE Key Size Error. An inappropriate value (8 being appropriate for single DES, and 16 and 24 being
appropriate for triple DES) was written to the DEU key size register
0 No error detected
1 Key size error
16 DSE Data Size Error (DSE): A value was written to the DEU data size register that is not a multiple of 64
bits.
0 No error detected
1 Data size error
15-0 — Reserved
Table 22-24. DISR Field Descriptions (Continued)
Bits Name Description