RTL8211C & RTL8211CL
Datasheet
Multi-port device=!U0*U2
Where: U0 is bit 0 of the Unformatted Page 1
U1 is bit 1 of the Unformatted Page 1
U2 is bit 2 of the Unformatted Page 1
Where there are two stations with the same configuration, the one with higher Master-Slave seed
SB[10:0] in the unformatted page 2 shall become Master.
Master-Slave configuration process resolution:
Successful: Bit 10.15 Master-Slave Configuration Fault is set to logical 0, and bit 10.14 is set to
logical 1 for Master resolution, or set to logical 0 for Slave resolution.
Unsuccessful: Auto-Negotiation restarts.
Fault detect: Bit 10.15 is set to logical 1 to indicate that a configuration fault has been detected.
Auto-Negotiation restarts automatically. This happens when both stations are set to manual Master
mode or manual Slave mode, or after seven attempts to configure the Master-Slave relationship
through the seed method has failed.
6.6.3. Auto-Negotiation PAUSE/ASYMMETRIC PAUSE Resolution
Auto-negotiation is also used to determine the flow control capability between link partners. Flow control
is a mechanism that can force a busy transmitting link partner to stop transmitting in a full duplex
environment by sending special MAC control frames. In IEEE 802.3u, a PAUSE control frame had already
been defined. However, in IEEE 802.3ab, a new ASY-PAUSE control frame was defined; if the MAC can
only generate PAUSE frames but is not able to respond to PAUSE frames generated by the link partner,
then it is called Asymmetric PAUSE.
PAUSE/ASYMMETRIC PAUSE capability can be configured by setting the ANAR bits 10 and 11 (Table
25, page 26). Link partner PAUSE capabilities can be determined from ANLPAR bits 10 and 11 (Table 26,
page 27). A PHY layer device such as the RTL8211C(L) is not directly involved in PAUSE resolution, but
simply advertises and reports PAUSE capabilities during the Auto-Negotiation process. The MAC is
responsible for final PAUSE/ASYMMETRIC PAUSE resolution after a link is established, and is
responsible for correct flow control actions thereafter.
Integrated 10/100/1000 Gigabit Ethernet Transceiver
17
Track ID: JATR-1076-21 Rev. 1.3
ETC [ ETC ]
