HAL System Library Support.........................................................................................................7-5
Software Files....................................................................................................................................7-8
Accessing the JTAG UART Core via a Host PC..........................................................................7-9
Register Map.....................................................................................................................................7-9
Interrupt Behavior......................................................................................................................... 7-10
Document Revision History.....................................................................................................................7-11
UART Core.......................................................................................................... 8-1
Core Overview..............................................................................................................................................8-1
Functional Description............................................................................................................................... 8-1
Avalon-MM Slave Interface and Registers................................................................................... 8-2
RS-232 Interface...............................................................................................................................8-2
Transmitter Logic.............................................................................................................................8-2
Receiver Logic...................................................................................................................................8-2
Baud Rate Generation..................................................................................................................... 8-3
Instantiating the Core..................................................................................................................................8-3
Configuration Settings.................................................................................................................... 8-3
Simulation Settings.......................................................................................................................... 8-6
Simulation Considerations......................................................................................................................... 8-7
Software Programming Model...................................................................................................................8-7
HAL System Library Support.........................................................................................................8-7
Software Files..................................................................................................................................8-11
Register Map...................................................................................................................................8-11
Interrupt Behavior......................................................................................................................... 8-16
Document Revision History.....................................................................................................................8-16
16550 UART........................................................................................................ 9-1
Core Overview..............................................................................................................................................9-1
Feature Description..................................................................................................................................... 9-1
Unsupported Features.....................................................................................................................9-2
Interface.............................................................................................................................................9-2
General Architecture....................................................................................................................... 9-4
Configuration Parameters.............................................................................................................. 9-4
DMA Support...................................................................................................................................9-5
FPGA Resource Usage.....................................................................................................................9-5
Timing and Fmax.............................................................................................................................9-6
Avalon-MM Slave............................................................................................................................ 9-7
Overrun/Underrun Conditions..................................................................................................... 9-8
Hardware Auto Flow-Control........................................................................................................9-9
Clock and Baud Rate Selection.................................................................................................... 9-10
Software Programming Model.................................................................................................................9-10
Overview......................................................................................................................................... 9-10
Supported Features........................................................................................................................9-10
Unsupported Features...................................................................................................................9-11
Configuration................................................................................................................................. 9-11
16550 UART API........................................................................................................................... 9-12
Driver Examples.............................................................................................................................9-16
TOC-4
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