s5920 Applied Micro Circuits Corporation (AMCC), s5920 Datasheet - Page 103
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s5920
Manufacturer Part Number
s5920
Description
Pci Product
Manufacturer
Applied Micro Circuits Corporation (AMCC)
Datasheet
1.S5920.pdf
(165 pages)
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S5920 – PCI Product: PCI Bus Protocol
Table 52. PCI Bus Commands (Continued)
1. Memory Read Multiple and Memory Read Line are executed as a Memory Read.
2. Memory Write and Invalidate is executed as a Memory Write.
PCI BURST TRANSFERS
The PCI bus, by default, expects burst transfers to be
executed. To successfully perform a burst transfer,
both the initiator and target must order their burst
address sequence in an identical fashion. There are
two different ordering schemes: linear address incre-
menting and 80486 cache line fill sequencing.
The S5920 supports only linear burst ordering.
Attempts to perform burst transfers with a scheme
other than this will cause the STOP# signal to be
asserted during the first data phase, thus issuing a dis-
connect to the initiator. The S5920 completes the initial
data phase successfully, but asserting STOP# indi-
103
DS1596
C/BE[3:0]#
1101
1110
1111
Memory Write and Invalidate
Memory Read Line
Command Type
Reserved
cates that the next access needs to be a completely
new cycle.
Some accesses to the S5920 controller do not support
burst transfers. For example, the S5920 does not
allow burst transfers when accesses are made to the
configuration or operation registers. Attempts to per-
form burst transfers to these regions will cause a
disconnect on the PCI bus, as described above.
Expansion ROM accesses also do not support bursts,
and will respond in the same way. Accesses to mem-
ory or I/O regions defined by the Base Address
Registers 1-4 may be bursts, if desired.
Revision 1.02 – April 12, 2007
AMCC Confidential and Proprietary
Data Book
Supported
Yes 1
Yes 2
No
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