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LAN8820 датащи(PDF) 19 Page - Microchip Technology

номер детали LAN8820
подробное описание детали  RGMII 10/100/1000 Ethernet Transceiver
PDF  83 Pages
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

LAN8820 датащи(HTML) 19 Page - Microchip Technology

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 2009-2015 Microchip Technology Inc.
DS00001871B-page 19
LAN8820/LAN8820I
The various RGMII modes and their corresponding configuration settings are summarized in Figure 3-3.
Timing information for the RGMII interface is provided in Section 5.5, "AC Specifications," on page 65. For additional
information on the RGMII interface, refer to the RGMII specification.
FIGURE 3-3:
RGMII MODES OF OPERATION
Note:
Strapping RGMII_ID_MODE high sets the device into Hybrid Mode. In order to set the device into ID Mode,
the RGMII PHY TXC Delay Enable and RGMII PHY RXC Delay Enable bits of the Control / Status Indica-
tions Register (27.[9:8]) must be configured via software to 01b.
MAC
PCB Trace Delay
Non-ID Mode (RGMII Specification)
(27.[9:8] = 00b, RGMII_ID_MODE = 0)
TXC
RXC
PCB Trace Delay
LAN8820/
LAN8820i
TXC
RXC
ID Mode (RGMII Specification)
(27.[9:8] = 01b)
RGMII PHY TXC Delay: Disabled
RGMII PHY RXC Delay: Disabled
Hybrid Mode
(27.[9:8] = 11b, RGMII_ID_MODE = 1)
TXD[3:0]
TXD[3:0]
RXD[3:0]
RXD[3:0]
MAC
TXC
RXC
LAN8820/
LAN8820i
TXC
RXC
TXD[3:0]
TXD[3:0]
RXD[3:0]
RXD[3:0]
RGMII PHY TXC Delay: Disabled
RGMII PHY RXC Delay: Enabled
ID
ID
MAC
TXC
RXC
LAN8820/
LAN8820i
TXC
RXC
TXD[3:0]
TXD[3:0]
RXD[3:0]
RXD[3:0]
RGMII PHY TXC Delay: Enabled
RGMII PHY RXC Delay: Enabled
ID
ID



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