Motorola MPC8260 - Manual (Page 549)

18-25 MPC8260 PowerQUICC II UserÕs Manual MOTOROLA
Part IV. Communications Processor Module
11 DGBL Destination global
0 Snooping is not activated.
1 Snooping is activated for write transactions to the destination.
In ßy-by mode, should be the same as SGBL.
12-13 DBO Destination byte ordering:
01 PowerPC little Endian.
1x Big endian (Motorola).
00 Reserved
In ßy-by mode, should be the same as SBO.
14 Ñ Reserved, should be cleared.
15 DDTB Destination data bus.
0 The destination address lies within the 60x bus.
1 The destination address lies within the local bus.
In ßy-by mode, should be the same as SDTB.
0x02 0-1 Ñ Reserved, should be cleared.
2 SGBL Source global
0 Snooping is not activated.
1 Snooping is activated for read transactions from the source.
In ßy-by mode, should be the same as DGBL.
3-4 SBO Source byte ordering:
01 PowerPC little endian
1x Big endian (Motorola)
00 Reserved
In ßy-by mode, should be the same as DBO.
5 Ñ Reserved, should be cleared.
6 SDTB Source data bus.
0 The source address lies within the 60x bus.
1 The source address lies within the local bus.
In ßy-by mode, should be the same as DDTB.
7-15 Ñ Reserved, should be cleared.
0x04 0Ð31 Data
Length
Number of bytes the IDMA transfers. Should be programmed to a value greater than
zero.
Notes: When operating with a peripheral that accepts only single bus transactions
(transfer size < 32), data length should be a multiple of the peripheral transfer size (STS
for S/D = 10, or DTS for S/D = 01). Also, there is no error notiÞcation if the data length
does not match the buffer sizes.
0x08 0Ð31 Source
Buffer
Pointer
Holds the address of the associated buffer. Buffers may reside in internal or external
memory. Note that if the source/destination is a device, the pointer should contain the
device address.
In ßy-by mode, the pointers should contain the memory address.
0x0C 0Ð31 Destination
Buffer
Pointer
Table 18-10. IDMA BD Field Descriptions (Continued)
Offset Bits Name Description