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DE1 User Manual
Signal Name
AUD_ADCLRCK
AUD_ADCDAT
AUD_DACLRCK
AUD_DACDAT
AUD_XCK
AUD_BCLK
I2C_SCLK
I2C_SDAT
FPGA Pin No.
PIN_A6
PIN_B6
PIN_A5
PIN_B5
PIN_B4
PIN_A4
PIN_A3
PIN_B3
Description
Audio CODEC ADC LR Clock
Audio CODEC ADC Data
Audio CODEC DAC LR Clock
Audio CODEC DAC Data
Audio CODEC Chip Clock
Audio CODEC Bit-Stream Clock
I2C Data
I2C Clock
Table 4.9. Audio CODEC pin assignments.
4.8 RS-232 Serial Port
The DE1 board uses the MAX232 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, and from the Datasheet folder on the DE1
System CD-ROM . Figure 4.16 shows the related schematics, and Table 4.10 lists the Cyclone II
FPGA pin assignments.
Figure 4.16. MAX232 (RS-232) chip schematic.
Signal Name
UART_RXD
UART_TXD
FPGA Pin No.
PIN_F14
PIN_G12
Description
UART Receiver
UART Transmitter
Table 4.10. RS-232 pin assignments.
39
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