H8250
Features
- Capable of running all existing 8250 software
- Adds or deletes standard asynchronous communication bits (start, stop, and parity) to or from the serial data
- Independently controlled transmit, receive, line status, and data set interrupts
- Programmable baud generator divides any input clock by 1 (216- 1) and generates the 16x clock
- Independent receiver clock input
- Modem control functions (CTSn, RTSn, DSRn, DTRn, RIn, and DCDn)
- Fully programmable serial interface
- False start bit detection
- Complete status register
- Internal diagnostic capabilities: loopback controls for communications link fault isolation
- Full prioritized interrupt system controls
Block Diagram
Figure 1 shows a block diagram of the function.
Figure 1: Block Diagram
Description
The H8250 is a standard universal asynchronous receiver/transmitter (UART) providing 100% software compatibility with the popular Intel 8250 device. It performs serial-to-parallel conversion on data originating from modems or other serial devices, and performs parallel-to-serial conversion on data from a CPU to these devices.
Developed for easy reuse in Altera® FPGA applications, the H8250 is available with several device families and optimized with competitive utilization and performance characteristics.
Device Utilization & Performance
Table 1 lists the typical device utilization results for the megafunction.
| Table 1. Typical Device Utilization for the Megafunction |
| Target Device |
Speed Grade |
Utilization |
Performance
(fmax) |
| Logic Elements (LEs) |
Embedded array blocks (EABs) |
I/O Pins |
| EPF10K30E |
-1 |
405 |
- |
40 |
126 MHz |
| EP20K30E |
-1 |
403 |
- |
40 |
141 MHz |
| EP1K10 |
-1 |
405 |
- |
40 |
126 MHz |
Deliverables
- EDIF netlist
- Assignment & configuration
- Symbol file
- Include file
- Vectors for testing the functionality of the megafunction including expected results
- Documentation
Contact Information
For additional information, contact CAST. Inc. at:
CAST, Inc.
11 Stonewall Court
Woodcliff Lake, NJ 07677
USA
Phone: +1 (845) 353-6160
Fax: +1 (845) 727-7607
E-mail: OpenCore@cast-inc.com
WWW: http://www.cast-inc.com
|
Literature
> 
