Intel IXF1104 manual Timing Specifics, Txer and Rxer Coding, Rgmii Signal Definitions

Intel® IXF1104 4-Port Gigabit Ethernet Media Access Controller

5.4.2Timing Specifics

The IXF1104 MAC RGMII complies with RGMII Rev1.2a requirements. Table 27 provides the timing specifics.

5.4.3TX_ER and RX_ER Coding

To reduce interface power, the transmit error condition (TX_ER) and the receive error condition (RX_ER) are encoded on the RGMII interface to minimize transitions during normal network operation (refer to Table 28 on page 97 for the encoding method). Table 27 provides signal definitions for RGMII.

Table 27. RGMII Signal Definitions

IXF1104	RGMII
	Standard	Source	Description
MAC Signal
	Signal
TXC_0:3	TXC	MAC	Depending on speed, the transmit reference clock is 125 MHz, 25
			MHz, or 2.5 MHz +/– 50ppm.
TD[3:0]_n	TD<3:0>	MAC	Contains register bits 3:0 on the rising edge of TXC and register bits
			7:4 on the falling edge of TXC.
TX_EN	TX_CTL	MAC	TXEN is on the leading edge of TXC.
			TX_EN xor TX_ER is on the falling edge of TXC.
RXC_0:3	RXC	PHY	Continuous reference clock is 125 MHz, 25 MHz, or 2.5 MHz +/– 50
			ppm.
RD[3:0]_n	RD<3:0>	PHY	Contains register bits 3:0 on the leading edge of RXC and register bits
			7:4 on the trailing edge of RXC.
RX_DV	RX_CTL	PHY	RX_DV is on the leading edge of RXC.
			RX_DV or RXERR is the falling edge of RXC.

The value of RGMII_TX_ER and RGMII_TX_EN are valid at the rising edge of the clock while TX_ER is presented on the falling edge of the clock. RX_ER coding behaves in the same way (see Table 28, Figure 19, and Figure 20).

Table 28. TX_ER and RX_ER Coding Description

Condition		Description
Receiving valid frame,	RX_DV = true		RX_ER = false
no errors	Logic High on rising edge of RXC		Logic High on the falling edge of RXC
Receiving valid frame,	RX_DV = true		RX_ER = true
with errors	Logic High on rising edge of RXC		Logic Low on the falling edge of RXC
Receiving invalid frame	RX_DV = false		RX_ER = false
(or no frame)	Logic Low on rising edge of RXC		Logic Low on the falling edge of RXC
Transmitting valid frame,	TX_EN = true		TX_ER =false
no errors	Logic High on rising edge of TXC		Logic High on the falling edge of TXC
Transmitting valid frame	TX_EN = true		TX_ER = true
with errors	Logic High on rising edge of TXC		Logic Low on the falling edge of TXC
Transmitting invalid	TX_EN = false		TX_ER = false
frame (or no frame)	Logic Low on rising edge of TXC		Logic low on the falling edge of TXC
NOTE: Refer to Figure 19 for TX_CTL behavior, and Figure 20 for RX_CTL behavior.

97 Datasheet

Document Number: 278757

Revision Number: 009

Revision Date: 27-Oct-2005