Chapter 1: ML505/ML506/ML507 Evaluation Platform
8. User Pushbuttons (Active-High)
Five active-High user pushbuttons are available for general purpose usage and are
arranged in a North-East-South-West-Center orientation (only the center one is cited in
Figure 1-2, page 15 ). Table 1-7 summarizes the user pushbutton connections.
R
Table 1-7:
User Pushbutton Connections
Reference
Designator
SW10
SW11
SW12
SW13
SW14
Label/Definition
N (GPIO North)
S (GPIO South)
E (GPIO East)
W (GPIO West)
C (GPIO Center)
FPGA Pin
U8
V8
AK7
AJ7
AJ6
9. CPU Reset Button (Active-Low)
The CPU reset button is an active-Low pushbutton and is used as a system or user reset
button. This pushbutton switch is wired only to an FPGA I/O pin so it can also be used as
a general-purpose pushbutton switch ( Table 1-8 ).
Table 1-8:
CPU Reset Connections
Reference
Designator
SW7
Label/Definition
CPU RESET
FPGA Pin
E9
10. XGI Expansion Headers
The board contains expansion headers for easy expansion or adaptation of the board for
other applications. The expansion connectors use standard 0.1-inch headers. The
expansion connectors contain connections to single-ended and differential FPGA I/Os,
ground, 2.5V/3.3V/5V power, JTAG chain, and the IIC bus. All signals on connectors J4
and J6 have matched length traces that are matched to each other.
Differential Expansion I/O Connectors
Header J4 contains 16 pairs of differential signal connections to the FPGA I/Os. This
permits the signals on this connector to carry high-speed differential signals, such as LVDS
data. All differential signals are routed with 100 Ω differential trace impedance. Matched
length traces are used across all differential signals on J5. Consequently, these signals
connect to the FPGA I/O, and they can be used as independent single-ended nets. The
V CCIO of these signals can be set to 2.5V or 3.3V by setting jumper J20. Table 1-9, page 23
summarizes the differential connections on this expansion I/O connector.
22
ML505/ML506/ML507 Evaluation Platform
UG347 (v3.1.2) May 16, 2011
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