Datasheet

Table Of Contents
1 2
MII_RX_CLK
MII_RXD[3:0]
MII_RX_DV
MII_RX_ER
VALID
RM46L852
SPNS185C SEPTEMBER 2012 REVISED JUNE 2015
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7.12 Ethernet Media Access Controller
The Ethernet Media Access Controller (EMAC) provides an efficient interface between the CPU 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.
7.12.1 Ethernet MII Electrical and Timing Specifications
Figure 7-22. MII Receive Timing
Table 7-37. Timing Requirements for EMAC MII Receive
NO. MIN MAX UNIT
t
su(MIIRXD - MIIRXCLKH)
Setup time, MII_RXD[3:0] before MII_RX_CLK rising edge 8 ns
1 t
su(MIIRXDV - MIIRXCLKH)
Setup time, MII_RX_DV before MII_RX_CLK rising edge 8 ns
t
su(MIIRXER - MIIRXCLKH)
Setup time, MII_RX_ER before MII_RX_CLK rising edge 8 ns
t
h(MIIRXCLKH - MIIRXD)
Hold time, MII_RXD[3:0] valid after MII_RX_CLK rising edge 8 ns
2 t
h(MIIRXCLKH - MIIRXDV)
Hold time, MII_RX_DV valid after MII_RX_CLK rising edge 8 ns
t
h(MIIRXCLKH - MIIRXER)
Hold time, MII_RX_ER valid after MII_RX_CLK rising edge 8 ns
168 Peripheral Information and Electrical Specifications Copyright © 2012–2015, Texas Instruments Incorporated
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