adm6999g Infineon Technologies Corporation, adm6999g Datasheet - Page 27

• Manufacturer Part Number: adm6999g
• Description: 8 Port 10/100 Mb/s + Gigabit Single Chip Ethernet Switch Controller
• Manufacturer: Infineon Technologies Corporation

Table 5
Configuration
ADM6999G
/GX
3.4.6.1
A two pins interface, LEDDATA and LEDCLK, provides external shift register to capture the LED status indicated
by the ADM6999G/GX. 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 3
3.4.6.2
Three LED per port are provided by ADM6999G/GX. Link/Act, Duplex/Col & Speed are three LED display of
ADM6999G/GX. Dual color LED mode is also supported by ADM6999G/GX. For easy production purpose
ADM6999G/GX will send test signals to each LED at power on reset stage. EEPROM register 12
configuration table.
ADM6999G/GX LED is active Low signal. Dupcol0 & Dupcol1 will check external signal at Reset time. If external
signal adds a pull high resister then LED will be active Low. If external signal adds a pull down resister then LED
will drive high.
Data Sheet
LED Display
Serial LED Interface
Serial LED Interface
LED Display Mode
8+1 GMII
Figure 3
LED Mode
1: Dual Color0: Single
Color
shows the external circuit.
Interface utilized
Serial Interface: Totally two pins, LEDCLK, and LEDDATA are
used to output the LED status.
27
Rev 1.31, 2005-11-25
ADM6999G/GX
H
Descriptions
defines LED