RM46L450
RM46L850
SPNS184 –SEPTEMBER 2012
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5.12 Ethernet Media Access Controller
The Ethernet Media Access Controller (EMAC) provides an efficient interface between the device and the
network. The EMAC supports both 10Base-T and 100Base-TX, or 10 Mbits/second (Mbps) and 100 Mbps
in either half- or full-duplex mode, with hardware flow control and quality of service (QoS) support.
The EMAC controls the flow of packet data from the device to the PHY. The MDIO module controls PHY
configuration and status monitoring.
Both the EMAC and the MDIO modules interface to the device through a custom interface that allows
efficient data transmission and reception. This custom interface is referred to as the EMAC control
module, and is considered integral to the EMAC/MDIO peripheral. The control module is also used to
multiplex and control interrupts.
5.12.1 Ethernet MII Electrical and Timing Specifications
1
2
MII_MRCLK
MII_MRXD
MII_MRXDV
MII_MRXER
VALID
Figure 5-22. MII Receive Timing
Table 5-36. MII Receive Timing
Parameter
Description
MIN
8ns
8ns
8ns
8ns
8ns
8ns
MAX
tsu(MIIMRXD)
tsu(MIIMRXDV)
tsu(MIIMRXER)
th(MIIMRXD)
Setup time, MIIMRXD to MIIMRCLK rising edge
Setup time, MIIMRXDV to MIIMRCLK rising edge
Setup time, MIIMRXER to MIIMRCLK rising edge
Hold time, MIIMRXD valid after MIIRCLK rising edge
Hold time, MIIMRXDV valid after MIIRCLK rising edge
Hold time, MIIMRXDV valid after MIIRCLK rising edge
th(MIIMRXDV)
th(MIIMRXER)
160
Peripheral Information and Electrical Specifications
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