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alternate data structure. After this cycle completes, the controller performs another four DMA transfers
using the primary data structure. The controller continues to switch from primary to alternate to primary…
until either:
? the host processor configures the alternate data structure for a basic cycle
? it reads an invalid data structure.
Note
After the controller completes the N primary transfers it invalidates the primary data
structure by setting the cycle_ctrl field to b000.
The controller only asserts dma_done[C] when the scatter-gather transaction completes using an auto-
request cycle.
In scatter-gather mode, the controller uses the primary data structure to program the alternate data
structure. Table 8.4 (p. 46) lists the fields of the channel_cfg memory location for the primary data
structure, that you must program with constant values and those that can be user defined.
Table 8.4. channel_cfg for a primary data structure, in memory scatter-gather mode
Bit
Field
Value
Description
Constant-value fields:
[31:30}
[29:28]
[27:26]
[25:24]
[17:14]
[3]
[2:0]
dst_inc
dst_size
src_inc
src_size
R_power
next_useburst
cycle_ctrl
b10
b10
b10
b10
b0010
0
b100
Configures the controller to use word increments for the address
Configures the controller to use word transfers
Configures the controller to use word increments for the address
Configures the controller to use word transfers
Configures the controller to perform four DMA transfers
For a memory scatter-gather DMA cycle, this bit must be set to zero
Configures the controller to perform a memory scatter-gather DMA cycle
User defined values:
[23:21]
[20:18]
dst_prot_ctrl
src_prot_ctrl
-
-
Configures the state of HPROT when the controller writes the destination data
Configures the state of HPROT when the controller reads the source data
[13:4]
n_minus_1
N
1
Configures the controller to perform N DMA transfers, where N is a multiple of four
Because the R_power field is set to four, you must set N to be a multiple of four. The value given by N/4 is the number of times
1
that you must configure the alternate data structure.
See Section 8.4.3.3 (p. 53) for more information.
Figure 8.4 (p. 47) shows a memory scatter-gather example.
2011-04-12 - d0001_Rev1.10
46
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