DS571 Datasheet, PDF (10/16 Pages) Xilinx, Inc – LogiCORE IP XPS UART Lite

LogiCORE IP XPS UART Lite (v1.02.a)
Table 8: UART Lite Status Register Bit Definitions
Bit(s)
Name
Core Access Reset Value
Description
0 - 23
Reserved
N/A
0
Reserved
Indicates that a parity error has occurred after the
last time the status register was read. If the UART is
configured without any parity handling, this bit is
always ’0’.
24
Parity Error
Read
’0’
The received character is written into the Receive
FIFO.
This bit is cleared when the status register is read
’0’ = No parity error has occurred
’1’ = A parity error has occurred
Indicates that a frame error has occurred after the
last time the status register was read. Frame Error is
defined as detection of a stop bit with the value ’0’.
The receive character is ignored and not written to
25
Frame Error
Read
’0’
the Receive FIFO.
This bit is cleared when the status register is read
’0’ = No Frame error has occurred
’1’ = A frame error has occurred
Indicates that a overrun error has occurred since the
last time the status register was read. Overrun is
when a new character has been received but the
26
Overrun Error
Read
’0’
Receive FIFO is full. The received character is
ignored and not written into the Receive FIFO. This
bit is cleared when the status register is read
’0’ = No interrupt has occurred
’1’ = Interrupt has occurred
Indicates that interrupts is enabled
27
Intr Enabled
Read
’0’
’0’ = Interrupt is disabled
’1’ = Interrupt is enabled
Indicates if the Transmit FIFO is full
28
Tx FIFO Full
Read
’0’
’0’ = Transmit FIFO is not full
’1’ = Transmit FIFO is full
29
Tx FIFO Empty
Read
Indicates if the Transmit FIFO is empty
’1’
’0’ = Transmit FIFO is not empty
’1’ = Transmit FIFO is empty
Indicates if the Receive FIFO is full
30
Rx FIFO Full
Read
’0’
’0’ = Receive FIFO is not full
’1’ = Receive FIFO is full
Indicates if the receive FIFO has valid data
31
Rx FIFO Valid
Data
Read
’0’
’0’ = Receive FIFO is empty
’1’ = Receive FIFO has valid data
DS571 June 22, 2011
www.xilinx.com
10
Product Specification