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Software Developer’s Manual 291
Register Descriptions
Table 13-61. Mode Encodings for LED Outputs
1
Mode Pneumonic State / Event Indicated
0000b LINK_10/1000
Asserted when either 10 or 1000 Mbps link is
established and maintained.
0001b LINK_100/1000
Asserted when either 100 or 1000 Mbps link is
established and maintained.
0010b LINK_UP
Asserted when any speed link is established and
maintained.
0011b ACTIVITY
Asserted when link is established and packets are
being transmitted or receive activity that passes
filtering.
0100b LINK/ACTIVITY
Asserted when link is established and when there is
no transmit or receive activity that passes filtering.
0101b LINK_10
Asserted when a 10 Mbps link is established and
maintained.
0110b LINK_100
Asserted when a 100 Mbps link is established and
maintained.
0111b LINK_1000
Asserted when a 1000 Mbps link is established and
maintained.
1000b PCIX_MODE
Asserted when Ethernet controller is in PCI-X mode
(deasserted in PCI mode).
1001b FULL_DUPLEX
Asserted when the link is configured for full duplex
operation (deasserted in half-duplex).
1010b COLLISION Asserted when a collision is observed.
1011b BUS_SPEED
Asserted when the Ethernet controller is operating
in a PCI 66 MHz or a PCI-X 133 MHz configuration
(high-speed PCI operation), deasserted for 33 MHz
PCI and 66 MHz PCI-X (as determined by pins
sampled at PCI reset).
1100b
BUS_SIZE
Reserved for the
82547GI/EI only)
Asserted when the Ethernet controller is operating
as a 64-bit PCI or PCI-X device, deasserted for 32-
bit configuration.
1101b PAUSED
Asserted when the Ethernet controller’s transmitter
is flow controlled.
1110b VCC/LED_ON
Always high. Assuming no optional inversion
selected, causes output pin high / LED ON for
typical LED circuit.
1. Not applicable to the 82544GC/EI.