User guide

C M M - 52259 J U N E 1 1 , 2 0 1 0
U S E R G U I D E
12
NOTE: To conform to the USB standard, DM and DP pull-downs must be applied in Host Mode
configuration.
NOTE: For Device Mode applications, apply DP pull-up for Full-Speed applications or DM pull-
up for Low-Speed applications. Do not apply both DM pull-up and DP pull-up simulta-
neously.
Ethernet
The CMM-52259 applies a 10/100 Mbps Ethernet / IEEE 802.3 communications port.
Physical Port
Network connection is made using an RJ-45 connector in a tab-down configuration. The con-
nector includes interface magnetics. The CMM-52259 applies a Micrel KSZ8041NL physical
layer transceiver (PHY) to interface between the network cable and the MCF52259. Hardware
strapping configures the PHY for default operation. Each of these setting is configurable in by
user application. Figure 4 below shows the default configuration for the Ethernet PHY.
Figure 4: Ethernet PHY Default Configuration
Function
Default Setting
Address
0x01
Config
MII
Isolate
Disable
Speed
100 Mbps
Duplex
Half-Duplex
Auto-Negotiate
Enabled
The PHY provides Auto MDI/MDI-X detection allowing the PHY to configure itself to the con-
nected cable. This allows the use of straight-through and cross-over cables without error. The
PHY also provide 2 output LED indicators used to indicate LINK, ACTIVITY and SPEED. Fig-
ure 5 below details the behavior of the output Ethernet LEDs.
Figure 5: Ethernet LED Indicators
LED
Color
Function
Default
SPD
Green
SPEED indicator
ON – 100BASE-T operation
OFF – 10BASE-T operation
LINK_ACT
Green
LINK / ACTIVITY
indicator
ON – Ethernet link present
Flash – Link activity
OFF – No Ethernet link
Refer to the Micrel, KSX8041NL datasheet for details on use and configuration of the Ethernet
PHY.