EDMA3 Registers
11.4.1.6.4 Chained Event Registers (CER, CERH)
When the OPTIONS parameter for a PaRAM entry is programmed to returned a chained completion code
(ITCCHEN = 1 and/or TCCHEN = 1), then the value dictated by the TCC[5:0] (also programmed in OPT)
forces the corresponding event bit to be set in the chained event registers (CER/CERH). The set chained
event is evaluated by the EDMA3CC logic for an associated transfer request submission to the transfer
controllers. This results in a chained-triggered transfer.
The chained event registers do not have any enables. The generation of a chained event is essentially
enabled by the PaRAM entry that has been configured for intermediate and/or final chaining on transfer
completion. The En bit is set (regardless of the state of EER.En/EERH.En) when a chained completion
code is returned from one of the transfer controllers or is generated by the EDMA3CC via the early
completion path. The bits in the chained event register are cleared when the corresponding events are
prioritized and serviced.
If the En bit is already set and another chaining completion code is return for the same event, then the
corresponding event is latched in the event missed registers (EMR.En/EMRH.En = 1). The setting of an
event is a higher priority relative to clear operations (via hardware). If set and clear conditions occur
concurrently, the set condition wins. If the event was previously set, then EMR/EMRH would be set
because an event is lost. If the event was previously clear, then the event remains set and is prioritized for
submission to the event queues.
The CER is shown in
and described in
. The CERH is shown in
and described in
Figure 11-76. Chained Event Register (CER)
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
E31
E30
E29
E28
E27
E26
E25
E24
E23
E22
E21
E20
E19
E18
E17
E16
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
E15
E14
E13
E12
E11
E10
E9
E8
E7
E6
E5
E4
E3
E2
E1
E0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
LEGEND: R = Read only; -n = value after reset
Table 11-60. Chained Event Register (CER) Field Descriptions
Bit
Field
Value
Description
31-0
En
Chained event for event 0-31.
0
No effect.
1
Corresponding DMA event is prioritized versus other pending DMA/QDMA events for submission to the
EDMA3TC.
Figure 11-77. Chained Event Register High (CERH)
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
E63
E62
E61
E60
E59
E58
E57
E56
E55
E54
E53
E52
E51
E50
E49
E48
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
E47
E46
E45
E44
E43
E42
E41
E40
E39
E38
E37
E36
E35
E34
E33
E32
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
LEGEND: R = Read only; -n = value after reset
974
Enhanced Direct Memory Access (EDMA)
SPRUH73H – October 2011 – Revised April 2013
Copyright © 2011–2013, Texas Instruments Incorporated