DMA_ES field descriptions (continued)
Field Description
• TCDn_CITER[CITER] is equal to zero, or
• TCDn_CITER[ELINK] is not equal to TCDn_BITER[ELINK]
2
SGE
Scatter/Gather Configuration Error
0 No scatter/gather configuration error
1 The last recorded error was a configuration error detected in the TCDn_DLASTSGA field. This field is
checked at the beginning of a scatter/gather operation after major loop completion if TCDn_CSR[ESG]
is enabled. TCDn_DLASTSGA is not on a 32 byte boundary.
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
22.3.7 Enable Request Register (DMA_ERQ)
The ERQ register provides a bit map for the 16 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 registers. These 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:
4000_8000h base + Ch offset = 4000_800Ch
Bit 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
R
0
W
Reset
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Bit
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
R
ERQ15
ERQ14
ERQ13
ERQ12
ERQ11
ERQ10
ERQ9 ERQ8 ERQ7 ERQ6 ERQ5 ERQ4 ERQ3 ERQ2 ERQ1 ERQ0
W
Reset
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Memory map/register definition
K22F Sub-Family Reference Manual, Rev. 4, 08/2016
446 NXP Semiconductors
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