DMA_ES field descriptions (continued)
Field
Description
1
SBE
Source Bus Error
0
No source bus error
1
The last recorded error was a bus error on a source read
0
DBE
Destination Bus Error
0
No destination bus error
1
The last recorded error was a bus error on a destination write
21.3.3 Enable Request Register (DMA_ERQ)
The ERQ register provides a bit map for the 16 implemented channels to enable the
request signal for each channel. The state of any given channel enable is directly affected
by writes to this register; it is also affected by writes to the SERQ and CERQ. The
{S,C}ERQ registers are provided so the request enable for a single channel can easily be
modified without needing to perform a read-modify-write sequence to the ERQ.
DMA request input signals and this enable request flag must be asserted before a
channel’s hardware service request is accepted. The state of the DMA enable request flag
does not affect a channel service request made explicitly through software or a linked
channel request.
Address: DMA_ERQ is 4000_8000h base + Ch offset = 4000_800Ch
Bit 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
R
W
Reset
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
DMA_ERQ field descriptions
Field
Description
31–16
Reserved
This read-only field is reserved and always has the value zero.
15
ERQ15
Enable DMA Request 15
0
The DMA request signal for the corresponding channel is disabled
1
The DMA request signal for the corresponding channel is enabled
14
ERQ14
Enable DMA Request 14
0
The DMA request signal for the corresponding channel is disabled
1
The DMA request signal for the corresponding channel is enabled
Table continues on the next page...
Memory map/register definition
K53 Sub-Family Reference Manual, Rev. 6, Nov 2011
460
Freescale Semiconductor, Inc.
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