Microchip Technology SA5 Series, Руководство пользователя

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Product Overview
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2019 Microchip Technology Inc. DS50002938A-page 11
FIGURE 1-2: Top Cover and Bottom Baseplate.
The baseplate consists of eight backwards-compatible gold-plated pins and recessed
20-lead Molex™ connector for new features (1PPS, USB, etc).
FIGURE 1-3: Pinout.
1.2.1 Communications Connections
The MAC is controlled either by the legacy serial port pins or with the high speed
USB-compatible pins on the Molex connector.
•
Serial Console Port: The serial port connection is made through pins 7 and 8 on
the baseplate of the MAC. This port allows a user to connect to a terminal or com-
puter using a terminal emulation software package. When connecting to this port,
use an appropriate converter chip such as the TRS3122E or similar to attain the
required LVCMOS levels.
Figure 1-2 shows the serial port pins 7 and 8 in the
lower-right region of the baseplate. The default speed is 57600 bps and higher
speeds of 230400 bps and 921600 bps are available.
• USB Port: The USB port is capable of making high speed communication with the
MAC though the Molex (J1) connector pins J-2, 4, and 6.
Note: “Compatibility” commands are not supported when communicating via USB
port. See
Appendix B. “Legacy Command Set (SA.3Xm)” .
1.2.2 Input Connections
• Analog Tuning: Analog Tuning is available on pin 1 for steering the MAC output
frequency by means of an externally supplied DC voltage. This method is for leg-
acy applications that cannot steer the MAC digitally via the serial/USB interface.
• 1PPS Input (x2): Two selectable LVDS 1PPS inputs can be provided on pins
J1-5,7 (PPS0-IN) or J1-1,3 (PPS1-IN) for aligning the MAC’s frequency and timing