XMOS XC-1A, Hardware Manual

Page: 4 / 18

XC-1A Hardware Manual (1.2) 4/18
XII
VI
A
B
C
D
VII
VIII
IX
XI
V
IIII
III
II
I
X
G
G
G
G
To reduce the number of pins required for the 12 clock-LEDs, the LED anodes are
connected to four 8-bit ports (8D) on processor 0, 1, 2 and 3 and the cathodes are
connected to two 1-bit ports (1E for green, 1F for red) on processor 0.
The schematic for the clock-LEDs is shown below
I II III IIII V VI VII VIII IX X XI XII
X1D40
PORT_CLOCKLED_1 PORT_CLOCKLED_2 PORT_CLOCKLED_3 PORT_CLOCKLED_0
X1D41 X1D42 X2D40 X2D41 X2D42 X3D40 X3D41 X3D42 X0D40 X0D41 X0D42
PORT_CLOCKLED_SELG
X0D12
PORT_CLOCKLED_SELR
0
0
1
1
PORT_CLOCKLED_SELG
0
1
0
1
Colour
Off
Green
Red
Red
To get yellow, alternate green/red in 4:1 ratio
PORT_CLOCKLED_SELR
X0D13
www.xmos.com