NAT-MCH Clock-PCB – Technical Reference Manual
Version 1.4
© N.A.T. GmbH
51
11.3.24
LED2 Control Register
The LED2 Control Register selects the LED2 function.
Table 53:
LED2_CTR Register
LED2 Control - Address 0x1C
Default value 0x00
Bit
7
6
5
4
3
2
1
0
Access
R
R
R
R
R
R/W
R/W
R/W
Func
- - - - -
LED2_CTR
Table 54:
LED2_CTR - Register Bits
Bit
Name
Function
[2..0] LED2_CTR
selects the LED2 function
0b000 – LED2 is on if the PLL is locked and blinks fast
if PLL is in holdover state (not supported with
FPGA version 1.2)
0b001 – LED2 is off
0b010 – LED2 is on
0b011 – LED2 blinks fast
0b100 – LED2 blinks slow
[7..3] -
no function
write as 0 and ignore when read
