Enhanced Direct Memory Access (eDMA)
MPC5510 Microcontroller Family Reference Manual, Rev. 1
12-10
Freescale Semiconductor
Preliminary
12.3.2.3
eDMA Enable Request Register (EDMA_ERQRL)
The EDMA_ERQRL provides a bit map for the 16 channels to enable the request signal for each channel.
EDMA_ERQRL maps to channels 15–0.
The state of any given channel enable is directly affected by writes to this register; the state is also affected
by writes to the EDMA_SERQR and EDMA_CERQR. The EDMA_CERQR and EDMA_SERQR are
provided so that the request enable for a single channel can be modified without performing a
read-modify-write sequence to the EDMA_ERQRL.
Both the eDMA 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 through software or a linked channel request.
NCE
NBYTES/CITER Configuration Error.
0
No NBYTES/CITER configuration error.
1
The last recorded error was a configuration error detected in the TCD.NBYTES or TCD.CITER fields,
indicating the following conditions exist:
• TCD.NBYTES is not a multiple of TCD.SSIZE and TCD.DSIZE, or
• TCD.CITER is equal to zero, or
• TCD.CITER.E_LINK is not equal to TCD.BITER.E_LINK.
SGE
Scatter-Gather Configuration Error.
0 No scatter-gather configuration error.
1 The last recorded error was a configuration error detected in the TCD.DLAST_SGA field, indicating
TCD.DLAST_SGA is not on a 32-byte boundary. This field is checked at the beginning of a
scatter-gather operation after major loop completion if TCD.E_SG is enabled.
SBE
Source Bus Error.
0 No source bus error.
1 The last recorded error was a bus error on a source read.
DBE
Destination Bus Error.
0 No destination bus error.
1 The last recorded error was a bus error on a destination write.
Offset: EDM 0x000E
Access: User read/write
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
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 12-4. eDMA Enable Request Low Register (EDMA_ERQRL)
Table 12-4. EDMA_ESR Field Descriptions (continued)
Field
Description