Texas Instruments eInfochips TMDXEVM6657L, Technical Reference Manual, Page: 30 / 91

Technical Reference Manual TMDXEVM6657L
SPRUHG7 - Revised August 2012
TMDXEVM6657LE
Page 30 / 90
2.8 Ethernet Switch
The C6657 Lite EVM supports 1 port of SGMII interface which is multiplexed between Gigabit RJ-45 connector
(Copper interface) and AMC finger (backplane SGMII interface) using a Gigabit Ethernet PHY Switch 88E1112
from Marvell. This SGMII port can be accessed either over RJ-45 Jack or AMC fingers (when inserted in chassis)
but not both of them simultaneously. When both of them are connected, the default priority is given to RJ-45
Jack.
The figure below shows the interface between the DSP and Ethernet PHY (PHY1):
DSP
(C6657)
SGMII
MDIO/
MDC
Eth PHY
(88E1112)
MDI
S_Px
F_Px
I2C
MDIO
2
LVL TXL
(PCA9306)
2.5V
2
1.8V
2
SGMII
4
2KB EEPROM
(24LC02B-I/ST)
10/100/1000Mbps
4
10/100/1000Mbps
8
AMC CON
(Fiber Link)
Port 0
RJ-45 JACK
(Cu Link)
Figure 2.6: C6657 Lite EVM Ethernet PHY Routing
PHY is directly programmed using a 256 Byte EEPROM and DSP intervention is not required. The LEDs (Status
0 and Status 1) indicate the speed of Ethernet link. LED (LOS) indicates the presence of link; ON if there is link
and OFF when there is no link. Please refer to table below for more details.
Table 2.6: LED Indication
LED (Colour)
1Gbps 100Mbps 10Mbps
Activity No Activity Activity No Activity Activity No Activity
Status 0 (Green) BLINK SOLID ON BLINK SOLID ON OFF OFF
Status 1 (Orange) OFF OFF BLINK SOLID ON BLINK SOLID ON