UART16750

Description

Implements a 16550/16750 UART core.

Features

- Full synchronous design
- Pin compatible to 16550/16750
- Register compatible to 16550/16750
- Baudrate generator with clock enable
- Supports 5/6/7/8 bit characters
- None/Even/Odd parity bit generation and detection
- Supports 1/1.5/2 stop bit generation
- None or 16/64 byte FIFO mode
- Receiver FIFO trigger levels 1/4/8/14/16/32/56
- Control lines RTS/CTS/DTR/DSR/DCD/RI/OUT1/OUT2
- Automatic flow control with RTS/CTS
- All interrupt sources/modes

Status

- Test script creation done, should cover most functions
- Test log file available

The core was synthesized on a Altera Cyclone II, connected to x86
standard hardware and than tested with standard OS drivers from:

- Linux 2.2/2.4/2.6
- Windows 2000/XP/Vista
- *BSD
- *DOS

Simulation

It's possible to simulate and test the design with GHDL.
A Makefile is available for starting the simulation. The testbench
creates a log file (uart_log.txt).

Resource usage

- Altera Cyclone II
- 440 LE
- 1216 memory bits
- Frequency: 130 MHz

- Xilinx Spartan 3E
- 378 Slices
- 1 RAMB
- Frequency: 100 MHz