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[/] [uart16550/] [trunk/] [rtl/] [verilog/] [uart_wb.v] - Rev 79

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79 Bug Fixes:
* Possible loss of sync and bad reception of stop bit on slow baud rates fixed.
Problem reported by Kenny.Tung.
* Bad (or lack of ) loopback handling fixed. Reported by Cherry Withers.

Improvements:
* Made FIFO's as general inferrable memory where possible.
So on FPGA they should be inferred as RAM (Distributed RAM on Xilinx).
This saves about 1/3 of the Slice count and reduces P&R and synthesis times.

* Added optional baudrate output (baud_o).
This is identical to BAUDOUT* signal on 16550 chip.
It outputs 16xbit_clock_rate - the divided clock.
It's disabled by default. Define UART_HAS_BAUDRATE_OUTPUT to use.		 gorban 7985d 10h /uart16550/trunk/rtl/verilog/uart_wb.v
75 Endian define added. Big Byte Endian is selected by default. mohor 8138d 16h /uart16550/trunk/rtl/verilog/uart_wb.v
73 major bug in 32-bit mode that prevented register access fixed. gorban 8150d 16h /uart16550/trunk/rtl/verilog/uart_wb.v
64 Warnings cleared. mohor 8201d 01h /uart16550/trunk/rtl/verilog/uart_wb.v
50 Bug in LSR[0] is fixed.
All WISHBONE signals are now sampled, so another wait-state is introduced on all transfers.		 gorban 8213d 18h /uart16550/trunk/rtl/verilog/uart_wb.v
48 Updated specification documentation.
Added full 32-bit data bus interface, now as default.
Address is 5-bit wide in 32-bit data bus mode.
Added wb_sel_i input to the core. It's used in the 32-bit mode.
Added debug interface with two 32-bit read-only registers in 32-bit mode.
Bits 5 and 6 of LSR are now only cleared on TX FIFO write.
My small test bench is modified to work with 32-bit mode.		 gorban 8216d 11h /uart16550/trunk/rtl/verilog/uart_wb.v
33 Small synopsis fixes gorban 8260d 23h /uart16550/trunk/rtl/verilog/uart_wb.v
29 Things connected to parity changed.
Clock devider changed.		 mohor 8317d 12h /uart16550/trunk/rtl/verilog/uart_wb.v
27 Stop bit bug fixed.
Parity bug fixed.
WISHBONE read cycle bug fixed,
OE indicator (Overrun Error) bug fixed.
PE indicator (Parity Error) bug fixed.
Register read bug fixed.		 mohor 8318d 17h /uart16550/trunk/rtl/verilog/uart_wb.v

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