PXD10RM Datasheet, PDF (504/1332 Pages) Freescale Semiconductor, Inc – PXD10 Microcontroller

Table 15-26. TCDn Word 5 (TCDn.{doff,citer}) Field Descriptions (continued)
Name
citer[6:14]
Description
Current “major” iteration count
Value
This 9 or 15-bit count represents the current major
loop count for the channel. It is decremented each
time the minor loop is completed and updated in the
transfer control descriptor memory. Once the major
iteration count is exhausted, the channel performs a
number of operations (e.g., final source and
destination address calculations), optionally
generating an interrupt to signal channel completion
before reloading the citer field from the beginning
iteration count (biter) field.
When the citer field is initially loaded by software, it
must be set to the same value as that contained in the
biter field.
doff[16:31]
Destination address signed offset
If the channel is configured to execute a single
service request, the initial values of biter and citer
should be 0x0001.
Sign-extended offset applied to the current
destination address to form the next-state value as
each destination write is completed.
Figure 15-26 and Table 15-27 define word 6 of the TCDn structure, the dlast_sga field.
Register address: DMA_Offset + 0x1000 + (32 x n) + 0x18
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
R
dlast_sga[0:15]
W
RESET: -
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
R
dlast_sga[16:31]
W
RESET: -
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
= Unimplemented
Figure 15-26. TCDn Word 6 (TCDn.dlast_sga) Field
15-34
PXD10 Microcontroller Reference Manual, Rev. 1
Preliminary—Subject to Change Without Notice
Freescale Semiconductor