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[/] [uart16550/] [trunk/] [rtl/] [verilog/] [uart_regs.v] - Rev 105

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105 Timeout interrupt should be generated only when there is at least ony
character in the fifo.		 igorm 7139d 05h /uart16550/trunk/rtl/verilog/uart_regs.v
99 Added synchronizer flops for RX input. tadejm 7324d 03h /uart16550/trunk/rtl/verilog/uart_regs.v
87 This fixes errors in some cases when data is being read and put to the FIFO at the same time. Patch is submitted by Scott Furman. Update is very recommended. gorban 7668d 22h /uart16550/trunk/rtl/verilog/uart_regs.v
84 The uart_defines.v file is included again in sources. gorban 7985d 17h /uart16550/trunk/rtl/verilog/uart_regs.v
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 7992d 15h /uart16550/trunk/rtl/verilog/uart_regs.v
68 lsr[7] was not showing overrun errors. mohor 8200d 01h /uart16550/trunk/rtl/verilog/uart_regs.v
66 rx push changed to be only one cycle wide. mohor 8207d 01h /uart16550/trunk/rtl/verilog/uart_regs.v
64 Warnings cleared. mohor 8208d 06h /uart16550/trunk/rtl/verilog/uart_regs.v
63 Synplicity was having troubles with the comment. mohor 8208d 07h /uart16550/trunk/rtl/verilog/uart_regs.v
60 Things related to msr register changed. After THRE IRQ occurs, and one
character is written to the transmit fifo, the detection of the THRE bit in the
LSR is delayed for one character time.		 mohor 8210d 04h /uart16550/trunk/rtl/verilog/uart_regs.v
59 MSR register fixed. mohor 8213d 01h /uart16550/trunk/rtl/verilog/uart_regs.v
58 After reset modem status register MSR should be reset. mohor 8213d 04h /uart16550/trunk/rtl/verilog/uart_regs.v
56 thre irq should be cleared only when being source of interrupt. mohor 8214d 04h /uart16550/trunk/rtl/verilog/uart_regs.v
54 LSR status bit 0 was not cleared correctly in case of reseting the FCR (rx fifo). mohor 8215d 05h /uart16550/trunk/rtl/verilog/uart_regs.v
52 Scratch register added gorban 8216d 18h /uart16550/trunk/rtl/verilog/uart_regs.v
50 Bug in LSR[0] is fixed.
All WISHBONE signals are now sampled, so another wait-state is introduced on all transfers.		 gorban 8220d 23h /uart16550/trunk/rtl/verilog/uart_regs.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 8223d 17h /uart16550/trunk/rtl/verilog/uart_regs.v
47 Fixed: timeout and break didn't pay attention to current data format when counting time gorban 8228d 19h /uart16550/trunk/rtl/verilog/uart_regs.v
45 Lots of fixes:
Break condition wasn't handled correctly at all.
LSR bits could lose their values.
LSR value after reset was wrong.
Timing of THRE interrupt signal corrected.
LSR bit 0 timing corrected.		 gorban 8230d 17h /uart16550/trunk/rtl/verilog/uart_regs.v
44 fixed more typo bugs gorban 8244d 16h /uart16550/trunk/rtl/verilog/uart_regs.v

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