Altera Embedded Peripherals IP - Manual (Page 231)

The following list explains each of the fields:
• Actual bytes transferred is used to determine how many bytes were transferred when the mSGDMA
is configured in ST-->MM mode with packet support enabled. Since packet transfers are terminated by
the IP providing the data, this field counts the number of bytes between the start-of-packet (SOP) and
end-of-packet (EOP) received by the write master. If the early termination bit of the response is also
set, then the actual bytes transferred is an underestimate if the transfer is unaligned.
• Error is used to determine if any errors were issued when the mSGDMA is configured in ST-->MM
mode with error support enabled. Each error bit is sticky so that errors can accumulate throughout the
transfer.
• Early Termination is used to determine if a transfer terminates because the transfer length is exceeded
when the SGDMA is configured in ST-->MM mode with packet support enabled. This bit is set when
the number of bytes transferred exceeds the transfer length set in the descriptor before the end-of-
packet is received by the write master.
Unsupported Feature
Prefetching of descriptor from available RAM location is not supported by mSGDMA currently. The
Altera mSGDMA is expecting host processor to feed in the descriptor one by one into the descriptor
buffer.
Additionally, sub-cores of mSGDMA are made available in the Qsys tool. If a user would like to reuse the
sub-core as independent component, it is accessible.
Document Revision History
Table 22-8: Document Revision History
Date and
Document
Version
Changes Made Summary of Changes
July 2014
v14.0.0 - Initial Release
UG-01085
2014.24.07
Unsupported Feature 22-15
Altera Modular Scatter-Gather DMA Altera Corporation
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