1 descriptor header, Descriptor header -57, Table 22-38 defines the header bits – Freescale Semiconductor MCF5480 User Manual
Page 659

Descriptors
MCF548x Reference Manual, Rev. 3
Freescale Semiconductor
22-57
Figure 22-40. Data Packet Descriptor Format
22.13.1.1 Descriptor Header
Descriptors are created by the host to guide the SEC through required crypto-graphic operations. The
descriptor header defines the operations to be performed, mode for each operation, and internal addressing
used by the controller and channel for internal data movement.
.
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
Field
PEUSEL
PMODE
SEUSEL
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Field
SMODE
TYPE
—
ST
DN
Addr
Descriptor Pointer + 0x0
Figure 22-41. Descriptor Header
Descriptor Header
Data Field Length 1
Data Field Pointer 1
Data Field Length 2
Data Field Pointer 2
Data Field Length 3
Data Field Pointer 3
Data Field Length 4
Data Field Pointer 4
Data Field Length 5
Data Field Pointer 5
Data Field Length 6
Data Field Pointer 6
Data Field Length 7
Data Field Pointer 7
Next Descriptor Pointer
Descriptor Pointer
+0x04
+0x20
+0x24
+0x28
+0x2C
+0x30
+0x34
+0x38
+0x0C
+0x08
+0x18
+0x1C
+0x14
+0x10
+0x3C