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D16550 UART with 16 Bytes FIFO

IP Target Vendor: 
Altera
IP Type: 
Design
IP Category: 
Bus Interface and IO
IP Supported FPGA Device: 
Apex 20KC
Apex 20KE
Apex II
Excalibur
Flex 10KE
Stratix
Stratix II
IP Description: 

"Features

Software compatible with 16450 and 16550 UARTs
Two modes of operation: UART mode and first in first out (FIFO) mode
In the FIFO mode, transmitter and receiver are each buffered with 16 byte FIFOs to reduce the number of interrupts presented to the CPU
Adds or deletes standard asynchronous communication bits (start, stop, and parity) to or from the serial data
In UART mode, receiver and transmitter are double buffered to eliminate a need for precise synchronization between the CPU and serial data
Independently controlled transmit, receive, line status, and data set interrupts
False start bit detection
16-bit programmable baud generator
Independent receiver clock input
Modem control functions (CTS, RTS, DSR, DTR, RI, and DCD)
Fully programmable serial-interface characteristics:
5-, 6-, 7-, or 8-bit characters
Even, odd, or no-parity bit generation and detection
1-, 1½-, or 2-stop bit generation
Baud generation
Complete status reporting capabilities
Line-break generation and detection. Internal diagnostic capabilities
Loop-back controls for communications link fault isolation
Break, parity, overrun, framing error simulation
Full prioritized interrupt system controls
Core can be fully customized to better meet customer requirements

Description
The D16550 is a UART soft core that is functionally identical to the TL16C550A. The D16550 allows serial transmission in two modes: UART mode and FIFO mode. In FIFO mode internal FIFOs are activated allowing 16 bytes (plus 3 bits of error data per byte in the receiver FIFO) to be stored in both receive and transmit directions. D16550 performs serial-to-parallel conversion on data characters received from a peripheral device or a Modem, and parallel-to-serial conversion on data characters received from the CPU. The CPU can read the complete status of the UART at any time during the functional operation. Status information reported includes the type and condition of the transfer operations being performed by the UART, as well as any error conditions (parity, over-run, framing, or break interrupt). D16550 includes a programmable baud rate generator that is capable of dividing the timing reference clock input by divisors of 1 to (216-1), and producing a 16× clock for driving the internal transmitter logic. Provisions are also included to use this 16× clock to drive the receiver logic. The D16550 has complete Modem control capability, and a processor-interrupt system. Interrupts can be programmed to the user's requirements, minimizing the computing required to handle the communications link."

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