ADLINK aTCA-N700 - Manual (Page 45)

aTCA-RN720 User's Guide
45
8 CPLD
The CPLD is used for various control purposes. Shown in Figure 8-1 is the interconnections to
the associated devices on the board. The CPLD connects to the front blade with LED DATA and
interrupt request signal IRQ. The LED data[0:1] come from the front blade switch. The front blade
forwards these multiplexed LED status (link, activity) signals to the QSFP/SFP+ status LEDs on
the faceplate. The CPLD decodes the LED data[0:1] and distribute 6 pairs of individual (Enable,
Link/Act) LED signals to each one of the SFP LEDs on the faceplate.
Also connected are the I2C HUBs to collect interrupt signals. The CPLD receives the reset signal
from the MMC and distributes to the retimers and the I2C HUBs.
The target device of the CPLD is LC4064V-75TN48C from Lattice Semiconductor.
Figure 8-1 CPLD Block
The LED Data for each switch port (total of 23 ports) has the following attributes:
• Link Status: Up=1, Down = 0.
• Act Status: Act=1, No Act = 0.
• Link-En Status: Enable = 1, Disable = 0.