RTL8201N
Datasheet
8.3. Flow Control Support
The RTL8201N supports flow control indications. The MAC can program the MII register to indicate to
the PHY that flow control is supported. When the MAC supports the Flow Control mechanism, setting
bit 10 of the ANAR register using the MDC/MDIO SMI interface, then the RTL8201N will add the
ability to its NWay ability. If the Link partner also supports Flow Control, then the RTL8201N can
recognize the Link partner’s NWay ability by examining bit 10 of ANLPAR (register 5).
8.4. Hardware Configuration and Auto-Negotiation
This section describes methods to configure the RTL8201N and set the auto-negotiation mode. Table 27
shows the various pins and their settings.
Table 27. Auto-Negotiation Mode Pin Settings
Pin Name
Description
Isolate
Set high to isolate the RTL8201N from the MAC. This will also isolate the MDC/MDIO management
interface. In this mode, power consumption is minimum (see 8.6 Power Down, Link Down, Power
Saving, and Isolation Modes, page 21).
RPTR
Pull high to set the RTL8201N into repeater mode. This pin is pulled low by default (see 8.8 Repeater
Mode Operation, page 23).
LDPS
Pull high to set the RTL8201N into LDPS mode. This pin is pulled low by default (see 8.6 Power
Down, Link Down, Power Saving, and Isolation Modes, page 21).
MII/SNIB
Pull high to set RTL8201N into MII mode operation, which is the default mode for the RTL8201.
This pin pulled low will set the RTL8201N into SNI mode operation. When set to SNI mode, the
RTL8201N will operate at 10Mbps (see 8.5 Serial Network Interface, page 21).
ANE
Auto-Negotiation Enable. Pull high to enable auto-negotiation (default). Pull low to disable auto-
negotiation and activate the parallel detection mechanism (see 8.2 Auto-Negotiation and Parallel
Detection, page 18).
SPEED
DUPLEX
When ANE is pulled high, the ability to adjust speed is setup. When ANE is pulled low, pull this pin
low to force 10Mbps operation and high to force 100Mbps operation (see 8.2 Auto-Negotiation and
Parallel Detection, page 18).
When ANE is pulled high, the ability to adjust the DUPLEX pin will be setup. When ANE is pulled
low, pull this pin low to force half duplex, high to force full duplex operation (see 8.2 Auto-
Negotiation and Parallel Detection, page 18).
Single-Chip/Port 10/100 Fast Ethernet PHYceiver
With Auto MDIX
20
Rev. 1.2
ETC [ ETC ]
