ADLINK aTCA-N700 - Manual (Page 45)

aTCA-RN710 User's Guide
45
8 CPLD
The complex programmable logic device (CPLD) is used for various control purposes. Shown in
Figure 8-1 are 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
SFP+ status LEDs on the faceplate. The CPLD decodes the LED data[0:1] and distribute 12 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. The CPLD details
can be found in the RTM1 CPLD datasheet.
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.