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UG144 April 24, 2009

Ethernet Statistics Core

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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

1 2 ... 116 117 118 119 120 121 122 123 124 125 126 ... 137 138

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