36
GX5280 User Guide
J4 Control Connector
This topic describes the GX5280’s Control connector J4 handles UUT control signals. This interface uses a 68-pin
VHD connector.
The following table defines the DIO to UUT control interface.
Pin
Signal
Type Pin
Signal
Type Pin
Signal
Type
Pin
Signal
Type
1
GND
P
18
GND
P
35
GND
P
52
GND
P
2
N/C
X
19
OEN0n
O
36
N/C
X
53
GND
P
3
GND
X
20
OEN1n
O
37
GND
X
54
GND
P
4
C
X
21
OEN2n
O
38
CLK_LVDS-
X
55
GND
P
5
GND
X
22
OEN3n
O
39
GND
X
56
GND
P
6
GND
P
23
CLK2O
P
40
GND
P
57
GND
P
7
N/C
X
24
XEN0n
I
41
N/C
X
58
GND
P
8
N/C
X
25
XEN1n
I
42
N/C
X
59
GND
P
9
N/C
X
26
XEN2n
I
43
N/C
X
60
GND
P
10
N/C
X
27
XEN3n
I
44
N/C
X
61
GND
P
11
GND
P
28
GND
P
45
GND
P
62
GND
P
12
N/C
X
29
N/C
I
46
N/C
X
63
GND
P
13
N/C
X
30
N/C
X
47
N/C
X
64
GND
P
14
N/C
X
31
5V
P
48
GND
P
65
GND
P
15
N/C
X
32
5V
P
49
GND
P
66
GND
P
16
EXCLK2
X
33
VTH
P
50
GND
P
67
VTH
P
17
EXCLK2O
X
34
GND
P
51
GND
P
68
GND
P
Table A-4: 68-Pin Control Connector Signals, J4.
Notes for Table A-4:
I: Input
O: Output
P: Power/GND
N/C:
Reserved, do not use.
OEN0-3n– Output Enable outputs. A low signal indicates output signal/signals in the indicated byte group is
currently enabled (active low).
XOE0-3n– External Output Enable inputs. A low signal disables the output drivers of the selected I/O group
(active low).
VTH – Termination voltage for data and control signals.
C, CLK_LVDS-:
LVDS clock positive and negative signals (PCB revision D or later, otherwise
N/C).
CLK2O – Output clock distributing external clocks or strobes to slaves (PCB revision D or later, otherwise
N/C).
EXCLK2 – External Clock input #2 (PCB revision D or later, otherwise N/C).
EXCLK2O – Output clock, distributes EXCLK2 to slaves (PCB revision D or later, otherwise N/C).
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