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ML505/ML506/ML507 Evaluation Platform
UG347 (v3.1.1) October 7, 2009
Chapter 1:
ML505/ML506/ML507 Evaluation Platform
R
3
8
. Rotary Encoder
The board provides connectivity to a rotary encoder (Panasonic EVQWK4001) with 15
detents, pushbutton, and two phase output signals for direction of rotation interpretation.
One complete revolution of the rotary wheel produces 15 pulses that are output on nets
FPGA_ROTARY_INCA and FPGA_ROTARY_INCB. Pushing the rotary wheel laterally
causes a momentary switch closure on the FPGA_ROTARY_PUSH output. The rotary
encoder circuit is wired so that all switch closures result in an active-High output.
Table 1-23
shows the connections for the rotary encoder.
39. Differential GTP/GTX Input and Output with SMA Connectors
Four SMA connectors (Rosenberger 32K153-400E3) provide a convenient and easily
accessible method of interfacing to GTP/GTX transceivers s for general-purpose
connectivity. The SMAs are designed and laid out to provide high-quality GTP/GTX
connections for speeds up to 3.125 Gb/s. Although the ML50
x
provides access to the
GTP/GTX transceivers, the board is not intended for transceiver characterization.
The transmit pair is connected directly from the FPGA to the SMA connectors while the
receive pair is connected to the FPGA via series AC coupling capacitors. If a DC-coupled
receive-side connection is desired, these capacitors can be replaced with 0
Ω
0402-size
resistors.
Table 1-24
shows the GTP transceiver pairs available through the SMA
connectors.
Table 1-23:
Rotary Encoder Connections
Name
FPGA Pin (U1)
FPGA_ROTARY_INCA
AH30
FPGA_ROTARY_INCB
AG30
FPGA_ROTARY_PUSH
AH29
Table 1-24:
GTP Pairs through SMA Connectors
Pin Name
FPGA Pin
Connector
ML505/ML506
ML507
SMA_RX_P
K1
J43
GTP1 of
GTP_X0Y4
receive pair
GTX1 of
GTX_X0Y5
receive pair
SMA_RX_N
J1
J42
SMA_TX_P
L2
J45
GTP1 of
GTP_X0Y4
receive pair
GTX1 of
GTX_X0Y5
receive pair
SMA_TX_N
K2
J44
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