XR17D158 Exar Corporation, XR17D158 Datasheet - Page 64

• Manufacturer Part Number: XR17D158
• Description: Eight-channel Pci-bus Uart
• Manufacturer: Exar Corporation

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PRELIMINARY
F
F
IGURE
IGURE
Transmit Trigger Level
24. T
25. R
RX Data Ready Interrupt at
TX Interrupt at
Receive Trigger Level
RX Data Input
TX Data
RANSMIT
ECEIVE
D
D
ATA
ATA
R
START
I
EADY
NTERRUPT AT
BIT
START
BIT
I
NTERRUPT AT
D0
Trigger Level
Set at Below
D0
D1
T
5 DATA BITS
BAUD RATE CLOCK of 16X or 8X
D1
RIGGER
6 DATA BITS
D2
7 DATA BITS
DATA BITS (5-8)
DATA BITS (5-8)
D2
T
below trigger level
RIGGER
De-asserted at
L
D3
EVEL
D3
64
UNIVERSAL (3.3V AND 5V) PCI BUS OCTAL UART
L
D4
D4
EVEL
D5
Trigger Level
D5
Clear at
Above
D6
D6
D7
D7
PARITY
PARITY
BIT
BIT
STOP
STOP
BIT
BIT
First byte that
above trigger
reaches the
trigger level
Asserted at
START
NEXT
DATA
BIT
level
TXNOFIFO-1
RXFIFO1
XR17D158
REV. P1.0.0