1-Gigabit Ethernet MAC v8.5 User Guide
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UG144 April 24, 2009
Ethernet Statistics Core
R
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The management interfaces of the two cores can be shared by avoiding bus conflict, as
follows:
•
Selecting a different address range for the statistics to that of the MAC configuration
registers. This is achieved by setting
host_addr[9]
to logic 0 when reading from the
statistics and logic 1 when writing and reading to the MAC configuration registers.
•
Using the
host_miim_sel
signal to differentiate between a statistical counter read
and a MAC initiated MDIO transaction. This is achieved by setting
host_miim_sel
to logic 0 for a statistical counter read and logic 1 for a MAC initiated MDIO
transaction.
Table 11-1
describes the type of host transactions that occur if the host interface is shared
(as illustrated in
Figure 11-5
).
Table 11-1:
Management Interface Transaction Types
Transaction
host_miim_sel
host_addr[9]
Configuration
0
1
MIIM access
1
X
Statistics Read
0
0
