ACD82224 Datasheet, PDF (30/77 Pages) List of Unclassifed Manufacturers – 24 Ports 10/100 Fast Ethernet Switch

SYSERR register (register 2)
The SYSERR register indicates the presence of system errors. It is automatically cleared after
each read. Table-7.2 lists the system error reported.
Table-7.2: SYSERR Register
Bit
0
1
2
3
4
5
6
7
8
Description
BIST failure indication
Reserved
Default
0
PAR register (register 3)
The PAR register indicates the presence of the partitioned ports and the port ID. A port can be
automatically partitioned if there is a consecutive false carrier event, an excessive collision or
jabber. This register is automatically cleared after each read. Table-7.3 lists the bits of this
register.
Table-7.3: PAR Register
Bit
Description
[0:23]
0 – Port X is not partitioned.
1 – Port X is partitioned.
Default
0
PMERR register (register 4)
The PMERR register indicates the presence of PHYs that have failed to respond to the PHY
Management command issued through the MDIO line. This register is automatically cleared after
each read. Table-7.4 describes the bits of this register.
Table-7.4: PMERR Register
Bit
Description
[0:23]
0 – Port X’s PHY responded
1 – Port X’s PHY failed to respond
Default
0
ACT register (register 5)
The ACT register indicates the presence of transmitting or receiving activities of each port since
the register was last read. This register is automatically cleared after each read. Table-7.5
describes all the bits of this register.
Table-7.5: ACT register
Bit
Description
[0:23]
0 – Port X no activity
1 – Port X has activity
Default
0
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