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Enhanced Direct Memory Access (eDMA)
MPC5566 Microcontroller Reference Manual, Rev. 2
Freescale Semiconductor
9-13
EDMA_SERQR are provided so that the request enable for a
single
channel can easily be modified without
the need to perform a read-modify-write sequence to the EDMA_ERQRH and EDMA_ERQRL.
Both the DMA request input signal and this enable request flag must be asserted before a channel’s
hardware service request is accepted. The state of the eDMA enable request flag does
not
affect a channel
service request made explicitly through software or a linked channel request.
As a given channel completes the processing of its major iteration count, there is a flag in the transfer
control descriptor that can affect the ending state of the EDMA_ERQR bit for that channel. If the
TCD.D_REQ bit is set, then the corresponding EDMA_ERQR bit is cleared after the major loop is
Address: Base + 0x0008
Access: User R/W
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R ERQ
63
ERQ
62
ERQ
61
ERQ
60
ERQ
59
ERQ
58
ERQ
57
ERQ
56
ERQ
55
ERQ
54
ERQ
53
ERQ
52
ERQ
51
ERQ
50
ERQ
49
ERQ
48
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
R ERQ
47
ERQ
46
ERQ
45
ERQ
44
ERQ
43
ERQ
42
ERQ
41
ERQ
40
ERQ
39
ERQ
38
ERQ
37
ERQ
36
ERQ
35
ERQ
34
ERQ
33
ERQ
32
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Figure 9-4. eDMA Enable Request High Register (EDMA_ERQRH)
Address: Base + 0x000C
Access: User R/W
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R ERQ
31
ERQ
30
ERQ
29
ERQ
28
ERQ
27
ERQ
26
ERQ
25
ERQ
24
ERQ
23
ERQ
22
ERQ
21
ERQ
20
ERQ
19
ERQ
18
ERQ
17
ERQ
16
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
R ERQ
15
ERQ
14
ERQ
13
ERQ
12
ERQ
11
ERQ
10
ERQ
09
ERQ
08
ERQ
07
ERQ
06
ERQ
05
ERQ
04
ERQ
03
ERQ
02
ERQ
01
ERQ
00
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Figure 9-5. eDMA Enable Request Low Register (EDMA_ERQRL)
Table 9-4. EDMA_ERQRH, EDMA_ERQRL Field Descriptions
Field
Description
0–63
ERQ
n
Enable DMA hardware service request
n.
0 The DMA request signal for channel n is disabled.
1 The DMA request signal for channel n is enabled.
Summary of Contents for MPC5566
Page 81: ...Introduction MPC5566 Microcontroller Reference Manual Rev 2 1 24 Freescale Semiconductor...
Page 135: ...Signal Description MPC5566 Microcontroller Reference Manual Rev 2 2 54 Freescale Semiconductor...
Page 189: ...Reset MPC5566 Microcontroller Reference Manual Rev 2 4 20 Freescale Semiconductor...
Page 603: ...Flash Memory MPC5566 Microcontroller Reference Manual Rev 2 13 38 Freescale Semiconductor...
Page 609: ...SRAM MPC5566 Microcontroller Reference Manual Rev 2 14 6 Freescale Semiconductor...
Page 1073: ...MPC5566 Microcontroller Reference Manual Rev 2 22 36 Freescale Semiconductor...
Page 1185: ...Nexus MPC5566 Microcontroller Reference Manual Rev 2 25 92 Freescale Semiconductor...