KSZ9563RNXI datasheet(60/226 Pages) MICROCHIP

60 / 226 page

KSZ9563R

DS00002419D-page 60

 2017-2018 Microchip Technology Inc.

4.11.3

REDUCED GIGABIT MEDIA INDEPENDENT INTERFACE (RGMII)

RGMII provides a common interface between RGMII PHYs and MACs, and has the following key characteristics:

• Pin count is reduced from 24 pins for GMII to 12 pins for RGMII.

• All speeds (10Mbps, 100Mbps and 1000Mbps) are supported at both half- and full-duplex.

• Data transmission and reception are independent and belong to separate signal groups.

• Transmit data and receive data are each four bits wide - a nibble.

• In-Band Status is supported when connected to a compatible PHY.

In RGMII operation, the RGMII pins function as follows:

• The MAC sources the transmit reference clock, TX_CLK, at 125MHz for 1000Mbps, 25MHz for 100Mbps, and

2.5MHz for 10Mbps.

• The PHY recovers and sources the receive reference clock, RX_CLK, at 125MHz for 1000Mbps, 25MHz for

100Mbps, and 2.5MHz for 10Mbps.

• For 1000BASE-T, the transmit data, TXD[3:0], is presented on both edges of TX_CLK, and the received data,

RXD[3:0], is clocked out on both edges of the recovered 125MHz clock, RX_CLK.

• TX_ER and RX_ER are combined with TX_EN and RX_DV, respectively, to form TX_CTL and RX_CTL. These

two RGMII control signals are valid at the falling clock edge.

After power-up or reset, the device is configured to RGMII mode if the RXD3 and RXD2 configuration strap pins are set

to “11”. Refer to Section 3.2.1, "Configuration Straps," on page 16 for available options. This device supports RGMII in-

band status as described in Section 4.11.3.1, RGMII In-Band Status (IBS). If IBS is not used,a configuration strap option

sets the speed of the RGMII interface at power-up to either 1000Mbps or 100Mbps. The XMII Port Control 0 Register

and XMII Port Control 1 Register can override the configuration strap option and set the RGMII speed to either 1000,

100 or 10Mbps. If a non-IBS PHY is connected to the RGMII port, it should be ensured that the PHY link speed is fixed

in order to avoid a mismatch to the RGMII speed.

The device provides the option to add a minimum of 1.5ns internal delay to either TX_CLK or RX_CLK, via the RGMII

Internal Delay control bits in the XMII Port Control 1 Register. This can reduce or eliminate the need to add trace delay

to the clock signals on the printed circuit board. RGMII_ID_ig enables delay on TX_CLK, and the default is off.

RGMII_ID_eg enables delay on RX_CLK, and the default is on. Users should also be aware of any internal clock delay

that may be added by the connected RGMII device.

TABLE 4-32:

RGMII SIGNAL DESCRIPTIONS

RGMII Signal

Name

(per spec)

RGMII Signal

(per KSZ9563R)

Pin Direction

(with respect to

PHY, KSZ9563R)

Pin Direction

(with respect to

MAC)

RGMII Signal Description

TXC

TX_CLK

Input

Output

Transmit Reference Clock

(125MHz for 1000Mbps, 25MHz for

100Mbps, 2.5MHz for 10Mbps)

TX_CTL

Input

Output

Transmit Control

TXD[3:0]

Input

Output

Transmit Data [3:0]

RXC

RX_CLK

Output

Input

Receive Reference Clock

(125MHz for 1000Mbps, 25MHz for

100Mbps, 2.5MHz for 10Mbps)

RX_CTL

Output

Input

Receive Control

RXD[3:0]

Output

Input

Receive Data [3:0]

KSZ9563RNXI 数据表(PDF) 60 Page - Microchip Technology

KSZ9563RNXI 数据表(HTML) 60 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

数据表下载

链接网址

KSZ9563RNXI 数据表(PDF) 60 Page - Microchip Technology

KSZ9563RNXI 数据表(HTML) 60 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

数据表 下载

链接网址

数据表下载