10/100M Ethernet-FIFO convertor
100 MB/s Ethernet MAC Layer Switch
1000BASE-X IEEE 802.3-2008 Clause 36 - Physical Coding Sublayer (PCS)
10G Ethernet MAC
10_100_1000 Mbps tri-mode ethernet MAC
16 Quadrature Amplitude Modulator and Demodulator
1G eth UDP / IP Stack
1G Ethernet ARP
1G Ethernet DPI
8b10b Encoder/Decoder
a VHDL 16550 UART core
A VHDL CAN Protocol Controller
adat receiver
ahci
AMI / HDB1 Line Codes
Another SPI Controller (with FIFO)
Another Wishbone Controlled UART
APB to I2C
APB to SPI
ARINC 429 Transmitter and Receiver
Async 8b/10b enc/dec
Asynchronous SPI master
Automatic BAUD rate generator
baud generator
Bitwise addressable GPIO
Bluespec 802.11a Transmitter
Bluetooth baseband controller
CAN Protocol Controller
Cheap Ethernet interface
Core1990: Interlaken protocol
DMT Transceiver
DMX512 transceiver
Documented Verilog UART
DQPSK Mapper
E1 Framer/Deframer
E1-G.703,G.704,G.706 framer/deframer
EBU/spdif to I2S project
EPP v1.9
Etherblade.net - FPGA ethernet line-rate encapsulator (EoIP, EoMPLS, PBB etc)
Ethernet 100/1000 Mbps
Ethernet 10GE Low Latency MAC

Ethernet 10GE MAC

Ethernet MAC 10/100 Mbps
Ethernet SMII
Ethernet Switch on Configurable Logic
EZUSB communication core
Fade - Light L3 Ethernet protocol for transmission of data from FPGA to embedded PC
FireWire (IEEE 1394)
FPGA Communication Framework
FPGA remote slow control via UART 16550
FT2232H USB Avalon Core
FT245R interface
FTDI Async FIFO I/F to Wishbone Bridge
FTDI FT60x USB3.0 to AXI bus master
Gamepads
General-Purpose I/O (GPIO) Core
GPIB (IEEE-488) controller
Hardware Assisted IEEE 1588 IP Core
HDB3/B3ZS Encoder+Decoder
HDLC controller
HyperTransport Tunnel

I2C controller core
I2C Master Slave Core
I2C master/slave Core
I2C Multiple Bus Controller
I2C Repeater
I2C Slave
I2C Traffic Logger
i2cgpio
i2c_to_wb
I2S Interface
I2S to Paralell ADC/DAC controller
I2S to Parallel Interface
I2S to WishBone
i8255 realisation in Verilog
IEEE 802.15.4 Core (physical layer)
IEEE 802.15.4 CRC
IPv4 Ethernet Packet Creator and Transmitter
IrDA
Iso7816_3_Master
JTAG Master
JTAG Slave / BoundaryScan Slave
LPC ROM emulator on USB dongle FPGA core set
lzs
MADI Receiver
Manchester Decoder for Wireless
Manchester to UART converter
Manchester UART
Minimac - the minimalist Ethernet MAC
Minimal UART Core
Multimicrophone Interface
nec ir remote control decoder
neopixel ws2812
OFDM modem
OHCI Full/Low-Speed USB Host Controller
One Wire Master
OP2P (OpenPeerToPeer Interface)
OPB SPI Slave
OPB-compatible OneWire Master
opb_usblite
PC-FPGA Communication Platform
Pipelined wishbone to AXI converter
Playstation 2 network adaptor IC CXD9731
PLB-to-WB Bridge
PS/2 Host Controller
PS2 Core
Quad SPI Flash Controller
Quadrature Decoder / Counter
RapidIO IP library
RS232
RS232
rtfSimpleUart
RXAUI Interface and XAUI to RXAUI Interface Adapter
SATA 2 HOST Controller
SATA Controller
SATA PHY
Saturn
Scan Based Serial Communication

sd card controller
SD/eMMC/MMC card emulator
SD/MMC Bootloader
SD/MMC Controller
SDHC Self Configuring Core
SDRAM AXI4
Serial ATA Host Bus Adapter Core for Virtex 6
Serial to parallel converter
Serial UART
Serial Uart
Serializer / Deserializer for audio fiber optic
SGMII
Simple AES3 / SPDIF receiver
Simple Asynchronous Serial Controller
Simple RS232 UART
https://opencores.org/projects/mmuart
Single Slot PCM Interface

Small 1-wire (onewire) master, with Altera tools integration
Smartcard interface (ISO7816-3)
smbus_if
SpaceWire
SpaceWire Light
SpaceWireSystemC
SPDIF Interface
SPDIF Transmitter
SPI based SD card controller
SPI controller core
SPI Controller for AD/DA chips on S3E/A/AN Starter Kits
SPI core
SPI Flash controller
SPI Master Lightweight
spi master receiver for ADC (AD747x)
SPI Master/Slave Interface
SPI serial DAC interface
SPI Verilog Master & Slave modules
SPI-slave Wishbone-Master
spigpio
spislave
SPIxIF
SPORT Interface
SSP_Slv
SSP_UART
Stepper Motor Controller
Super-I/O (SIO) controller
SystemC USB1.1 IP Core
SystemVerilog uart16550
TCP IP Core
TCP/IP socket
TDM controller
TI TLV320AIC1106 PCM Codec Altera Avalon IP core
TIME SLOT INTERCHANGE DIGITAL SWITCH
tiny SPI
Uart (FIFO cpu interface) with SV Self-Checking Testbench
UART 16550 core
Uart block
UART to / from fiber optic

UART to Bus
UART To SPI
ART with PLB interface
UART16750
uart6551
UART8SYSTEMC
UDP/IP Core
UDP/IPv4 for 10G Ethernet
ULPI Wrapper
USB 1.1 PHY (VHDL)
USB 1.1 Simulation (VHDL)
USB 1.1 Function IP Core
USB 1.1 Host and Function IP core
USB 1.1 PHY
USB 2.0 Function Core
USB Device Core
USB FT232H Avalon-MM interface]\\ [[https://opencores.org/projects/usb_host_core|USB Host Core
USB to UART
Versatile IO
vSPI
wb_uart
Wiegand Controller (SIA AC-01-1996.10)
Wishbone LPC Host and Peripheral Bridge
Wishbone protocol to axi4 protocol
Wishbone Register Bank Intercon Multi-master Multi-slave
Wishbone SD Card Controller
wishbone uart controller 8 bit
WishboneAXI
xSPi
YANU - UART with predictive interrupt events on Rx/Tx buffers state