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TMS signal steers the actions of the programming state machine. The TDO pin outputs
information back through the parallel port. Removing the shunt from jumper J23 isolates
the TCK pin from the parallel port so the CPLD will not be inadvertently reprogrammed
during routine parallel port operations. The series resistor prevents the TDO output from
interfering with the general-purpose I/O pin during routine parallel port operations.
XC95108
CPLD
The table below lists the connections from the parallel port to the general-purpose I/O pins
of the CPLD:
J23
tdi
tms
tck
tdo
Parallel
XC95108
Port Pin
CPLD Pin
1 (C0)
79
2 (D0)
77
3 (D1)
74
4 (D2)
72
5 (D3)
70
6 (D4)
68
7 (D5)
67
8 (D6)
66
9 (D7)
65
10 (S6)
64
11 (S7)
63
12 (S5)
61
13 (S4)
60
14 (C1)
78
15 (S3)
76
16 (C2)
73
17 (C3)
71
28
c
0
d
0
d
1
d
2
d
3
d
4
d
5
d
Parallel Port
6
d
Connector
7
s
(J10)
6
s
7
s
5
s
4
c
1
s
3
c
2
c
3
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