GPIO Intel® FPGA IP User Guide: Intel® Arria® 10 and Intel® Cyclone® 10 GX Devices

ID 683136
Date 7/15/2021
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GPIO Intel® FPGA IP Interface Signals

Depending on parameter settings you specify, different interface signals are available for the GPIO IP core.
Figure 7.  GPIO IP Core Interfaces


Figure 8.  GPIO Interface Signals


Table 3.  Pad Interface SignalsThe pad interface is the physical connection from the GPIO IP core to the pad. This interface can be an input, output or bidirectional interface, depending on the IP core configuration. In this table, SIZE is the data width specified in the IP core parameter editor.
Signal Name Direction Description
pad_in[SIZE-1:0] Input

Input signal from the pad.

pad_in_b[SIZE-1:0] Input

Negative node of the differential input signal from the pad. This port is available if you turn on the Use differential buffer option.

pad_out[SIZE-1:0] Output Output signal to the pad.
pad_out_b[SIZE-1:0] Output

Negative node of the differential output signal to the pad. This port is available if you turn on the Use differential buffer option.

pad_io[SIZE-1:0] Bidirectional

Bidirectional signal connection with the pad.

pad_io_b[SIZE-1:0] Bidirectional

Negative node of the differential bidirectional signal connection with the pad. This port is available if you turn on the Use differential buffer option.

Table 4.  Data Interface SignalsThe data interface is an input or output interface from the GPIO IP core to the FPGA core. In this table, SIZE is the data width specified in the IP core parameter editor.
Signal Name Direction Description
din[DATA_SIZE-1:0] Input

Data input from the FPGA core in output or bidirectional mode. DATA_SIZE depends on the register mode:

  • Bypass or simple register— DATA_SIZE = SIZE
  • DDIO without half-rate logic— DATA_SIZE = 2 × SIZE
  • DDIO with half-rate logic— DATA_SIZE = 4 × SIZE
dout[DATA_SIZE-1:0] Output

Data output to the FPGA core in input or bidirectional mode, DATA_SIZE depends on the register mode:

  • Bypass or simple register— DATA_SIZE = SIZE
  • DDIO without half-rate logic— DATA_SIZE = 2 × SIZE
  • DDIO with half-rate logic— DATA_SIZE = 4 × SIZE
oe[OE_SIZE-1:0] Input

OE input from the FPGA core in output mode with Enable output enable port turned on, or bidirectional mode. OE is active high. When transmitting data, set this signal to 1. When receiving data, set this signal to 0. OE_SIZE depends on the register mode:

  • Bypass or simple register— DATA_SIZE = SIZE
  • DDIO without half-rate logic— DATA_SIZE = SIZE
  • DDIO with half-rate logic— DATA_SIZE = 2 × SIZE
Table 5.  Clock Interface SignalsThe clock interface is an input clock interface. It consists of different signals, depending on the configuration. The GPIO IP core can have zero, one, two, or four clock inputs. Clock ports appear differently in different configurations to reflect the actual function performed by the clock signal.
Signal Name Direction Description
ck Input

In input and output paths, this clock feeds a packed register or DDIO if you turn off the Half Rate logic parameter.

In bidirectional mode, this clock is the unique clock for the input and output paths if you turn off the Separate input/output Clocks parameter.

ck_fr Input

In input and output paths, these clocks feed the full-rate and half-rate DDIOs if your turn on the Half Rate logic parameter.

In bidirectional mode, the input and output paths use these clocks if you turn off the Separate input/output Clocks parameter.

ck_hr
ck_in Input

In bidirectional mode, these clocks feed a packed register or DDIO in the input and output paths if you specify both these settings:

  • Turn off the Half Rate logic parameter.
  • Turn on the Separate input/output Clocks parameter.
ck_out
ck_fr_in Input

In bidirectional mode, these clocks feed a full-rate and half-rate DDIOS in the input and output paths if you specify both these settings

  • Turn on the Half Rate logic parameter.
  • Turn on the Separate input/output Clocks parameter.

For example, ck_fr_out feeds the full-rate DDIO in the output path.

ck_fr_out
ck_hr_in
ck_hr_out
cke Input Clock enable.
Table 6.  Termination Interface SignalsThe termination interface connects the GPIO IP core to the I/O buffers.
Signal Name Direction Description
seriesterminationcontrol Input Input from the termination control block (OCT) to the buffers. It sets the buffer series impedance value.
parallelterminationcontrol Input Input from the termination control block (OCT) to the buffers. It sets the buffer parallel impedance value.
Table 7.  Reset Interface SignalsThe reset interface connects the GPIO IP core to the DDIOs.
Signal Name Direction Description
sclr Input Synchronous clear input. Not available if you enable sset.
aclr Input Asynchronous clear input. Active high. Not available if you enable aset.
aset Input Asynchronous set input. Active high. Not available if you enable aclr.
sset Input Synchronous set input. Not available if you enable sclr.

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