System
Core
Physical
Layer
Device
(PHY)
EMAC
MDIO
RGMII_TCLK
RGMII_TD[3:0]
RGMII_TCTL
RGMII_RCLK
RGMII_RD[3:0]
RGMII_RCTL
MDIO_CLK
MDIO_DATA
Integration
Table 14-7. RMII Interface Signal Descriptions (continued)
Signal
Type
Description
Receive error. The receive error signal is asserted to indicate that an error was
RMII_RXER
I
detected in the received frame.
Management data clock. The MDIO data clock is sourced by the MDIO module
MDIO_CLK
O
on the system. It is used to synchronize MDIO data access operations done on
the MDIO pin.
MDIO DATA. MDIO data pin drives PHY management data into and out of the
PHY by way of an access frame consisting of start of frame, read/write
MDIO_DATA
I/O
indication,PHY address, register address, and data bit cycles. The MDIO_DATA
signal acts as an output for all but the data bit cycles at which time it is an input
for read operations.
14.2.7 RGMII Signal Connections and Descriptions
shows a device with integrated CPSW and MDIO interfaced via a RGMII connection in a
typical system.
Figure 14-5. RGMII Interface Connections
1174
Ethernet Subsystem
SPRUH73H – October 2011 – Revised April 2013
Copyright © 2011–2013, Texas Instruments Incorporated