EP80579 Datasheet, PDF (329/1916 Pages) Intel Corporation – Intel® EP80579 Integrated Processor Product Line

Intel^® EP80579 Integrated Processor
Figure 12-16.Source in Buffer Initialization and Destination in 4-Byte Granularity Constant
Mode Transfer
MSB
Memory
LSB
ADDRESS
64-bit Destination
A5 81 BC E6
A5 81 BC E6
...
A5 81 BC E6
4001 0300H
4001 0300H
4001 0300H
4001 0300H
Programmed Values
EDMACTL 0000 0088H
SUAR/SAR A581 BCE6H
DUAR/DAR
TCR
DCR
4001 0304H
0000 0014H
0004 503FH
10
byte number
Bus operation
DESTINATION
DWORD store@ 40010304
(5 times)
12.5.3
12.6
12.7
PCI Express Traffic Class
To provide traffic shaping and quality of service within the system fabric, the EDMA
contains the traffic class field within the DCR. Traffic class is provided to the external
switches, bridges, and other fabric devices to allow one transaction to pass another
based on a software generated priority map. The three bit field in the DCR is directly
copied to the transaction traffic class field in the PCI-Express header as write
transactions are generated to PCI-Express. This field is ignored for all other
destinations.
Channel Data Queuing
Each channel contains a data buffer that is four cache-lines in size (256 bytes). The
data buffer holds data temporarily to facilitate pipelining and hide latency, improving
the throughput of data transfers between the source and destination.
Error Conditions
Any of several possible error conditions may arise during a transfer depending on which
interfaces the transfer utilizes. The interfaces covered are the EDMA controller
interface, the memory interface, and the I/O subsystem destination port interface. All
error conditions are reported by setting the corresponding error bits in the Channel
Status Register (CSR).
The subsections below describe all possible errors at each interface that the EDMA
controller must detect and report. For those errors resulting in a channel abort, the
response to the error is highly configurable. The controller may be configured to
August 2009
Order Number: 320066-003US
Intel^® EP80579 Integrated Processor Product Line Datasheet
329