Enhanced Direct Memory Access (eDMA)
MPC5565 Microcontroller Reference Manual, Rev. 1.0
Freescale Semiconductor
9-11
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
complete, disabling the DMA hardware request. Otherwise if the D_REQ bit is cleared, the state of the
EDMA_ERQR bit is unaffected.
9.2.2.4
eDMA Enable Error Interrupt Register (EDMA_EEIRL)
The EDMA_EEIRL provides a bit map for the 32 channels to enable the error interrupt signal for each
channel. EDMA_EEIRL maps to channels 31-0.
The state of any given channel’s error interrupt enable is directly affected by writes to these registers; it is
also affected by writes to the EDMA_SEEIR and EDMA_CEEIR. The EDMA_SEEIR and
EDMA_CEEIR are provided so that the error interrupt enable for a
single
channel can easily be modified
without the need to perform a read-modify-write sequence to the EDMA_EEIRL.
Both the DMA error indicator and this error interrupt enable flag must be asserted before an error interrupt
request for a given channel is asserted.
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 9-4. eDMA Enable Request Low Register (EDMA_ERQRL)
Table 9-4. EDMA_ERQRL Field Descriptions
Field
Description
0–31
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.
Содержание MPC5565
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Страница 553: ...Flash Memory MPC5565 Microcontroller Reference Manual Rev 1 0 13 38 Freescale Semiconductor...
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Страница 895: ...Deserial Serial Peripheral Interface DSPI MPC5565 Microcontroller Reference Manual Rev 1 0 19 72 Freescale Semiconductor...
Страница 973: ...Preface MPC5565 Microcontroller Reference Manual Rev 1 0 21 36 Freescale Semiconductor...
Страница 1145: ...MPC5565 Register Map MPC5565 Microcontroller Reference Manual Rev 1 0 A 60 Freescale Semiconductor...
Страница 1153: ...Calibration MPC5565 Microcontroller Reference Manual Rev 1 0 B 8 Freescale Semiconductor...