Emerson PMPPC7448 사용자 설명서

6-1

Section 6

Ethernet Interface

The PmPPC7448 provides three independent full duplex Ethernet ports. Using the Marvell
MV64460, these ports are configured to one 10/100 Mbps Media Independent Interface
(MII) and two 10/100/1000 Mbps Gigabit MII (GMII). The two gigabit Ethernet ports (ports
0 and 1) are routed through PMC connector P14. The 10/100 Mbps Ethernet port (port 2) is
routed to the front panel mini-USB connector.

Note:

Since GbE ports 0 and 1 are routed through the PHYs directly to connector P14, magnetics are required on
the Rear Transition Module (RTM) or baseboard.

Some additional Ethernet features on the MV64460 include:

• IEEE 802.3 compliant MAC layer function

• 10/100/1000 megabit operation — half and full duplex are automatically mapped out

through the PHY

• IEEE 802.3x flow-control for full duplex operation mode and back pressure for half

duplex mode

• Internal and external loop back modes

• Short frame transmission (less than 64 bytes) zero padding and long frame transmission

(limited only by external memory size)

The Micrel KSZ8721CL 10/100BASE-TX/FX and two Broadcom BCM5461S 1000BASE-
T/100BASE-TX/FX/10BASE-T transceivers provide:

• Compliance with IEEE 802.3 standards

• Compliance with PICMG 2.15 standards

• Low power consumption; less than 340 mW

• IEEE 1149.1 (JTAG) boundary scan chain support

Note:

Proprietary information on the Micrel and Broadcom Ethernet transceiver devices is not available in this
user’s manual. Please refer to the Micrel web site at http://www.micrel.com or the Broadcom web site at
http://www.broadcom.com for available documentation.

MV64460 ETHERNET REGISTERS

The MV64460 is capable of implementing three 10/100/1000 Ethernet controllers. These
controllers interface with the PHY via MII or GMII interface.

The Serial Management Interface (SMI) unit continuously queries the PHY devices for their
link status. The PHY addresses for the link query operation are programmable per port in
the PHY_Address register.