Freescale Semiconductor MPC5200B ユーザーズマニュアル
BestComm DMA Registers—MBAR+0x1200
MPC5200B Users Guide, Rev. 1
Freescale Semiconductor
13-9
13.15.8
SDMA Task Control 0 Register—MBAR + 0x121C
SDMA Task Control 1 Register—MBAR + 0x121E
Table 13-8. SDMA Task Control 0 Register
SDMA Task Control 1 Register
msb 0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R
En
Val
Alw
Init
IN[4:0]
Auto
Start
High
En
Hold
Rsvd
AS [3:0]
W
RESET:
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31 lsb
R
TCR1 (same as for TCR0)
W
RESET:
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Bit
Name
Description
0
EN
Each of the sixteen tasks has an associated task control register. Only one register is
shown. At system reset, all bits are initialized to logic zeros.
shown. At system reset, all bits are initialized to logic zeros.
Enable - Task Enable
0 = Disabled
1 = Enabled
This bit can be set or cleared by the programmer at any time when a task is enabled or
disabled. This bit is also set by the PTD logic if the auto-restart bit is set and the task
completes.
disabled. This bit is also set by the PTD logic if the auto-restart bit is set and the task
completes.
1
Val
Valid - Initiator Number is Valid
0 = Initiator is not valid
1 = Initiator is valid
This bit is set by the engine logic when it obtains the requestor value from the first DRD
that is parsed. This bit is cleared by the logic when the task completes. At system reset,
this bit is cleared.
that is parsed. This bit is cleared by the logic when the task completes. At system reset,
this bit is cleared.
2
Alw Init
Always Init - Decode of the always initiator
0 = The always initiator is not being used
1 = The always initiator is being used
This bit is a status bit only and is set and cleared by writing the initiator number into the
Task Control Register.
Task Control Register.
3:7
IN[4:0]
InitNum[4:0] - Initiator number from task descriptor
These bits are registered when the SDMA engine has parsed the first DRD to obtain the
requestor number. These bits are cleared by system reset. These bits can be written by the
programmer when the Hold Init Num bit is set or being set and the task is not enabled.
requestor number. These bits are cleared by system reset. These bits can be written by the
programmer when the Hold Init Num bit is set or being set and the task is not enabled.
At system reset, these bits are cleared.
8
Auto Start
Auto-Start - Task Start
0 = Task will not restart within program control
1 = Task will restart at end of task automatically.
This bit can be set or cleared by the programmer at any time. This bit is also cleared if the
SDMA engine encounters an error in the task. At system reset, this bit is cleared.
SDMA engine encounters an error in the task. At system reset, this bit is cleared.