Rs-232 Serial Port; Ps/2 Serial Port - Altera DE2-70 User Manual

5.9 RS-232 Serial Port

The DE2-70 board uses the ADM3202 transceiver chip and a 9-pin D-SUB connector for RS-232
communications. For detailed information on how to use the transceiver refer to the datasheet,
which is available on the manufacturer's web site, or in the Datasheet/RS232 folder on the DE2-70
System CD-ROM. Figure 5.15 shows the related schematics, and Table 5.13 lists the Cyclone II
FPGA pin assignments.
Signal Name
UART_RXD
UART_TXD
UART_CTS
UART_RTS

5.10 PS/2 Serial Port

The DE2-70 board includes a standard PS/2 interface and a connector for a PS/2 keyboard or mouse.
In addition, users can use the PS/2 keyboard and mouse on the DE2-70 board simultaneously by an
plug an extension PS/2 Y-Cable. Figure 5.16 shows the schematic of the PS/2 circuit. Instructions
for using a PS/2 mouse or keyboard can be found by performing an appropriate search on various
educational web sites. The pin assignments for the associated interface are shown in Table 5.14.
Figure 5.15. MAX232 (RS-232) chip schematic.
FPGA Pin No.
PIN_D21
PIN_E21
PIN_G22
PIN_F23
Table 5.13. RS-232 pin assignments.
Description
UART Receiver
UART Transmitter
UART Clear to Send
UART Request to Send
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DE2-70 User Manual