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XC-1 Hardware Manual (1.3.2)
To reduce the number of pins required for the 12 clock-LEDs, the LED anodes are
connected to three 4-bit ports (4A, 4B and 4C) on processor 0 and the cathodes are
connected to two 1-bit ports (1E for green, 1F for red) that are active high.
The schematic for the clock-LEDs is shown below
I
X0D15 X0D20 X0D21
PORT_CLOCKLED_0
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VI
II
III
IIII
V
X0D2
X0D3
X0D8
PORT_CLOCKLED_0
IX
G
C
G
B
III
VI
VII
VIII
X0D9
X0D4
X0D5
PORT_CLOCKLED_0
PORT_CLOCKLED_SELG
PORT_CLOCKLED_SELR
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G
D
A
G
IX
X
XI
XII
X0D6
X0D7
X0D14
X0D12
X0D13
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