MAC7200 datasheet(306/976 Pages) FREESCALE

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The SPP DMA Controller Module (SPP_DMA2)

MAC7200 Microcontroller Family Reference Manual, Rev. 2

228

Freescale Semiconductor

Figure 12-22 and Table 12-26 define word 5 of the TCDn structure, the citer and doff fields.

Table 12-25. TCDn Word 4 (TCDn.daddr) Field Descriptions

Field

Description

31–0

daddr[31:0]

Destination address. Memory address pointing to the destination data.

Rciter.

e_link

citer[14:9] or

citer.linkch[5:0]

citer[8:0]

Reset

—

———————————————

9876543210

doff[15:0]

Reset

—

———————————————

= Unimplemented

Figure 12-22. TCDn Word 5 (TCDn.{citer,doff}) Fields

Table 12-26. TCDn Word 5 (TCDn.{doff,citer}) Field Descriptions

Field

Description

citer.e_link

Enable channel-to-channel linking on minor loop complete. As the channel completes the inner minor loop, this flag

enables the linking to another channel, defined by citer.linkch[5:0]. The link target channel initiates a channel

service request via an internal mechanism that sets the TCD.start bit of the specified channel. If channel linking is

disabled, the citer value is extended to 15 bits in place of a link channel number. If the "major" loop is exhausted,

this link mechanism is suppressed in favor of the major.e_link channel linking. This bit must be equal to the

biter.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.

30–25

citer[14:9]

citer.linkch

[5:0]

Current “major” iteration count or Link channel number. If (TCD.citer.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 citer field.

else

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

citer.linkch[5:0] by setting that channel’s TCD.start bit. The value contained in citer.linkch[5:0] must not exceed the

number of implemented channels.

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