adm6999ux Infineon Technologies Corporation, adm6999ux Datasheet - Page 27

• Manufacturer Part Number: adm6999ux
• Description: Adm6999u 9 Port 10/100 Mb/s Single Chip Ethernet Switch Controller
• Manufacturer: Infineon Technologies Corporation

Table 5
Configuration
ADM6999U
/UX
3.4.6.1
A two pins interface, LEDDATA and LEDCLK, provides external shift register to capture the LED status indicated
by the ADM6999U/UX. The status is encapsulated within the shift sequence, which is a consecutive stream of 8-
bit status words. The first word is the DUPCOL status, the second is the speed status, and the last is the LNKACT
status. Each word contains 8 bits and each bit corresponds to each port of the designated LED status. The
designated LED status is sent first followed by port1 then port 2, etc.. The shift sequence is repeated every 40 ms
and each bit last 640ns.
Figure 4
3.4.6.2
This interface is specific and it is only applied in the Ebus mode. It uses three control and 8 LED output pins to
display the PHY status. Using this interface can lower the system cost effectively.
circuit.
Data Sheet
LED Display
Serial LED Interface
Serial LED Interface
Scan LED Interface
8+1 EBus
Figure 4
LED Mode
1: serial interface0:
scan interface
shows the external circuit.
Interface utilized
Serial Interface: Totally two pins, LEDCLK, and LEDDATA are
used to output the LED status.Scan Interface: Three control
and eight LED status pins are used to output the phy status.
27
Figure 5
Rev. 1.42, 2005-11-25
shows the external
ADM6999U/UX
Data Sheet
Descriptions