MSC8144E Reference Manual, Rev. 3
26-178
Freescale
Semiconductor
Security Engine (SEC)
26.5.11.15 KEU Key Data Registers 3–4 (KEUKDR[3–4])
The KEUKDR[3–4] together hold one 128-bit key used for F9 message authentication.
KEUKDR3 (IK-high) holds the first 8 bytes (1–8). KEUKDR4 (IK-low) holds the second 8 bytes
(9–16). The KEU Key Data Registers must be written before message processing begins and
cannot be written while the block is processing data, or a context error will occur.
If the ‘F9 only’ mode is set, the integrity key data may be optionally written to KEUKDR[1–2].
This eliminates the need for the host to offset from the base key address to write to
KEUKDR[3–4] while using the KEU exclusively for the F9 integrity function. Reading from
either of these registers results in an address error being reflected in the KEUISR.
26.5.11.16 KEU Input FIFO/Output FIFO
The KEU uses an input FIFO/output FIFO pair to hold data before and after the encryption
process. Normally, the channels control all access to these FIFOs. For host-controlled operation,
a write to anywhere in the KEU FIFO address space enqueues data to the KEU input FIFO, and a
read from anywhere in the KEU FIFO address space dequeues data from the KEU output FIFO.
Writes to the input FIFO go first to a staging register which can be written by byte, 4-byte, or
8-byte accesses. When all 8 bytes of the staging register are written, the entire 8-bytes is
automatically enqueued into the FIFO. If any byte is written twice between enqueues, it causes an
error interrupt of type AE from the EU. When writing the last portion of data, it is not necessary
to write all 8 bytes. Any last bytes remaining in the staging register are automatically padded with
zeros and forced into the input FIFO when the KEU End_of_Message Register is written.
KEUKDR3
KEU Key Data Registers 3–4
Offset 0xCE410
KEUKDR4
Offset 0xCE418
Bits
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
48
Field
IK
Type
W
Reset 0x0000
Bits
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
Field
IK
Type
W
Reset
0x0000
Bits 31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
Field
IK
Type
W
Reset 0x0000
Bits
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Field
IK
Type
W
Reset 0x0000
Summary of Contents for MSC8144E
Page 1: ...MSC8144E Reference Manual Quad Core Media Signal Processor MSC8144ERM Rev 3 July 2009 ...
Page 48: ...MSC8144E Reference Manual Rev 3 xlviii Freescale Semiconductor ...
Page 86: ...MSC8144E Reference Manual Rev 3 1 38 Freescale Semiconductor Overview ...
Page 168: ...MSC8144E Reference Manual Rev 3 3 60 Freescale Semiconductor External Signals ...
Page 242: ...MSC8144E Reference Manual Rev 3 5 26 Freescale Semiconductor Reset ...
Page 314: ...MSC8144E Reference Manual Rev 3 8 24 Freescale Semiconductor General Configuration Registers ...
Page 414: ...MSC8144E Reference Manual Rev 3 10 14 Freescale Semiconductor MSC8144E SC3400 DSP Subsystem ...
Page 452: ...MSC8144E Reference Manual Rev 3 11 38 Freescale Semiconductor Internal Memory Subsystem ...
Page 520: ...MSC8144E Reference Manual Rev 3 12 68 Freescale Semiconductor DDR SDRAM Memory Controller ...
Page 1070: ...MSC8144E Reference Manual Rev 3 21 28 Freescale Semiconductor Timers ...