KSZ9031RNXIA データシートの表示（PDF） - Micrel

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KSZ9031RNXIA

Gigabit Ethernet Transceiver with RGMII Support

Micrel 

Micrel, Inc.

KSZ9031RNX

• Write value 0x03FF (delay GTX_CLK and RX_CLK pad skews to their maximum values) to MMD Address 2h,

Register 8h

- Write Register 0xD = 0x0002

// Select MMD Device Address 2h

- Write Register 0xE = 0x0008

// Select Register 8h of MMD Device Address 2h

- Write Register 0xD = 0x4002

// Select register data for MMD Device Address 2h, Register 8h

- Write Register 0xE = 0x03FF

// Write value 0x03FF to MMD Device Address 2h, Register 8h

RGMII In-Band Status

The KSZ9031RNX provides in-band status to the MAC during the inter-frame gap when RX_DV is de-asserted. RGMII

in-band status is always enabled after power-up.

The in-band status is sent to the MAC using the RXD[3:0] data pins, and is described in Table 7.

Table 7. RGMII In-Band Status

RX_DV

RXD3

RXD[2:1]

RXD0

0

(valid only when RX_DV is

low)

Duplex Status

0 = Half-duplex

1 = Full-duplex

RX_CLK clock speed

00 = 2.5MHz (10Mbps)

01 = 25MHz (100Mbps)

10 = 125MHz (1000Mbps)

11 = Reserved

Link Status

0 = Link down

1 = Link up

May 14, 2015

27

Revision 2.2

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