
Chapter 5: 1G/10 Gbps Ethernet PHY IP Core 5–15
Register Interface and Register Descriptions
November 2012 Altera CorporationAltera Transceiver PHY IP Core
User Guide
GMII PCS Registers
Table 5–17 describes the 1G/10GbE GMII PCS registers.
Table 5–17. GMII PCS Registers (Part 1 of 2)
address Bit R/W Name Description
0x90
9RW
RESTART_AUTO_
NEGOTIATION
Set this bit to 1 to restart the Clause 37 Auto-Negotiation
sequence. For normal operation, set this bit to 0 which is
the default value.
12 RW
AUTO_NEGOTIATION_
ENABLE
Set this bit to 1 to enable Clause 37 Auto-Negotiation. The
default value is 1.
15 RW
Reset
Set this bit to 1 to generate a synchronous reset pulse
which resets all the PCS state machines, comma detection
function, and the 8B/10B encoder and decoder. For normal
operation, set this bit to 0. This bit self clears.
0x91
2R
LINK_STATUS
A value of 1 indicates that a valid link is operating. A value
of 0 indicates an invalid link. If link synchronization is lost,
this bit is 0.
3R
AUTO_NEGOTIATION_
ABILITY
A value of 1 indicates that the PCS function supports
Clause 37 Auto-Negotiation.
5R
AUTO_NEGOTIATION_
COMPLETE
A value of 1 indicates the following status:
■ The Auto-Negotiation process is complete.
■ The Auto-Negotiation control registers are valid.
0x94
5RW
FD
Full-duplex mode enable for the local device. Set to 1 for
full-duplex support.
6RW
HD
Half-duplex mode enable for the local device. Set to 1 for
half-duplex support. This bit should always be set to 0.
8:7 RW
PS2,PS1
Pause support for local device. The following encodings
are defined for PS1/PS2:
■ 2’b00: Pause is not supported
■ 2’b0 1: Asymmetric pause toward link partner
■ 2’b10: Symmetric pause
■ 2’b11: Pause is supported on TX and RX
13:12 RW
RF2,RF1
Remote fault condition for local device. The following
encodings are defined for RF1/RF2:
■ 2’b00: No error, link is valid (reset condition)
■ 2’b0 1: Offline
■ 2’b10: Failure condition
■ 2’b11: Auto-negotiation error
14 RW
ACK
Acknowledge for local device. A value of 1 indicates that
the device has received three consecutive matching ability
values from its link partner.
15 RW
NP
Next page. In the device ability register, this bit is always
set to 0.
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