DE2-115: User Manual

Figure 4-24 Connections between FPGA and ZT3232 (RS-232) chip
Table 4-18
RS-232 Pin Assignments
Signal Name FPGA Pin No. Description I/O Standard
UART_RXD PIN_G12 UART Receiver 3.3V
UART_TXD PIN_G9 UART Transmitter 3.3V
UART_CTS PIN_G14 UART Clear to Send 3.3V
UART_RTS PIN_J13 UART Request to Send 3.3V
4.13 PS/2 Serial Port
The DE2-115 board includes a standard PS/2 interface and a connector for a PS/2 keyboard or
mouse. Figure 4-25 shows the schematic of the PS/2 circuit. In addition, users can use the PS/2
keyboard and mouse on the DE2-115 board simultaneously by plugging an extension PS/2 Y-Cable
(See Figure 4-26). Instructions for using a PS/2 mouse or keyboard can be found by performing an
appropriate search on various educational websites. The pin assignments for the associated interface
are shown in Table 4-19.
Note: If users connect only one PS/2 equipment, the PS/2 interface between FPGA I/O
should be “PS2_CLK” and “PS2_DAT”.
Figure 4-25 Connection between FPGA and PS/2
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