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Ixiasoft
1.2.5.1.1.2. Parallel I/O
Note: This module is instantiated in the top level Platform Designer system in the System Console Control design example. This module is instantiated in the Nios® subsystem in the Nios® Control design example.
Parallel I/O (PIO) modules provide general input/output (I/O) access from the Avalon® master (JTAG to Avalon® master bridge for System Console control or Nios® subsystem for Nios® control). There are two sets of 32-bit PIO registers:
- Status registers—input from the HDL components to the Avalon® master
- Control registers—output from the Avalon® master to the HDL components
The registers are assigned in the top level HDL file (io_status for status registers, io_control for control registers). The tables below describe the signal connectivity for the status and control registers.
Bit | Signal |
---|---|
0 | Core PLL locked |
1 | TX transceiver ready (for duplex and simplex TX data path only) |
2 | RX transceiver ready (for duplex and simplex RX data path only) |
3 | Test pattern checker data error (for duplex and simplex RX data path only) |
4 | TX link error (for duplex and simplex TX data path only) |
5 | RX link error (for duplex and simplex RX data path only) |
Bit | Signal |
---|---|
0 | RX serial loopback enable (for duplex data path only) |
30 | Global reset |
31 | SYSREF |