MAC7200 datasheet(308/976 Pages) FREESCALE

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The SPP DMA Controller Module (SPP_DMA2)

MAC7200 Microcontroller Family Reference Manual, Rev. 2

230

Freescale Semiconductor

biter[15:0]

Reset

————————————————

9876543210

bwc

major.linkch[5:0]

done active major.

e_link

e_sg d_req

start

Reset

————————

—————

= Unimplemented

Figure 12-24. TCDn Word 7 (TCDn.{biter,control/status}) Fields

Table 12-28. TCDn Word 7 (TCDn.{biter, control/status}) Field Descriptions

Field

Description

biter.e_link

Enable channel-to-channel linking on minor loop complete. This is the initial value copied into the citer.e_link

field when the major loop is completed. The citer.e_link field controls channel linking during channel execution.

This bit must be equal to the citer.e_link bit otherwise a configuration error will be reported.

0 The channel-to-channel linking is disabled.

1 The channel-to-channel linking is enabled.

biter[14:9]

biter.linkch[5:0]

Beginning “major” iteration count or Beginning Link channel number. This is the initial value copied into the

citer field or citer.linkch field when the major loop is completed. The citer fields controls the interation count

and link ing during channel execution.

if (TCD.biter.e_link = 0) then

No channel-to-channel linking (or chaining) is performed after the inner "minor" loop is exhausted. TCD word

5, bits [30:25] are used to form a 15 bit biter field.

else

After the "minor" loop is exhausted, the dma_engine initiates a channel service request at the channel defined

by biter.linkch[5:0] by setting that channel’s TCD.start bit.

The value contained in biter.linkch[5:0] must not exceed the number of implemented channels

biter[8:0]

Beginning “major” iteration count. This is the initial value copied into the citer field or citer.linkch field when the

major loop is completed. The citer fields controls the interation count and link ing during channel execution.

This 9 or 15-bit count represents the beginning major loop count for the channel. As the major iteration count

is exhausted, the contents of the entire 16 bit biter entry is reloaded into the 16 bit citer entry. When the biter

field is initially loaded by software, it must be set to the same value as that contained in the citer field. If the

channel is configured to execute a single service request, the initial values of biter and citer should be 0x0001.

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