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ML505/ML506/ML507 Evaluation Platform
UG347 (v3.1.1) October 7, 2009
Chapter 1:
ML505/ML506/ML507 Evaluation Platform
R
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.
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
).
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.
Table 1-7:
User Pushbutton Connections
Reference
Designator
Label/Definition
FPGA Pin
SW10
N (GPIO North)
U8
SW11
S (GPIO South)
V8
SW12
E (GPIO East)
AK7
SW13
W (GPIO West)
AJ7
SW14
C (GPIO Center)
AJ6
Table 1-8:
CPU Reset Connections
Reference
Designator
Label/Definition
FPGA Pin
SW7
CPU RESET
E9
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