MAC7200 datasheet(303/976 Pages) FREESCALE

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The SPP DMA Controller Module (SPP_DMA2)

MAC7200 Microcontroller Family Reference Manual, Rev. 2

Freescale Semiconductor

225

smod[4:0]

ssize[2:0]

dmod[4:0]

dsize[2:0]

Reset

————————————————

9876543210

soff[15:0]

Reset

————————————————

= Unimplemented

Figure 12-18. TCDn Word 1 (TCDn.{soff,smod,ssize,dmod,dsize}) Fields

Table 12-22. TCDn Word 1 (TCDn.{smod,ssize,dmod,dsize,soff}) Field Descriptions

Field

Description

31–27

smod[4:0]

Source address modulo.

Source address modulo feature is disabled.

non-0 The value defines a specific address bit which is selected to be either the value after saddr + soff calculation

is performed or the original register value. This feature provides the ability to easily implement a circular data

queue. For data queues requiring power-of-2 “size” bytes, the queue should be based at a 0-modulo-size

address and the smod field set to the appropriate value to freeze the upper address bits. The bit select is

defined as ((1 << smod[4:0]) - 1) where a resulting 1 in a bit location selects the next state address for the

corresponding address bit location and a 0 selects the original register value for the corresponding address

bit location. For this application, the soff is typically set to the transfer size to implement post-increment

addressing with the smod function constraining the addresses to a 0-modulo-size range.

26–24

ssize[2:0]

Source data transfer size.

000

8-bit

001 16-bit

010 32-bit

011 64-bit

100 16-byte (32-bit implementations only)

101 32-byte (if supported by the platform)

110 Reserved

111 Reserved

The attempted specification of a 64-bit source size in a 32-bit AMBA AHB bus implementation produces a

configuration error. Likewise, the attempted specification of a 16-byte source size in a 64-bit AMBA AHB bus

implementation generates a configuration error. The attempted specification of a 32-byte burst on platforms that do

not support such a transfer type will result in a configuration error.

23–19

dmod[4:0]

Destination address modulo. See the smod[5:0] definition.

18–16

dsize[2:0]

Destination data transfer size. See the ssize[2:0] definition.

15–0

soff[15:0]

Source address signed offse. Sign-extended offset applied to the current source address to form the next-state

value as each source read is completed.

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