Altera DE2-115 User Manual download pdf (Page 56)

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

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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Altera DE2-115 User Manual Page 56