xr16v2550im Exar Corporation, xr16v2550im Datasheet - Page 14

• Manufacturer Part Number: xr16v2550im
• Description: High Performance Duart With 16-byte Fifo
• Manufacturer: Exar Corporation

XR16V2550
HIGH PERFORMANCE DUART WITH 16-BYTE FIFO
F
F
IGURE
IGURE
Receive Data
16X or 8X or 4X Clock
Byte and Errors
16 bytes by 11-bit wide
8. R
9. R
( DLD[5:4] )
16X or 8X or 4X C lock
ECEIVER
ECEIVER
FIFO
( D LD[5:4] )
and Errors
Data Byte
R eceive
O
O
PERATION IN NON
PERATION IN
Receive Data Shift
Register (RSR)
Data FIFO
LSR bits
Tags in
Receive
FIFO
Receive
Error
4:2
Data
-FIFO M
AND
Receive D ata Shift
Register (R SR)
H olding R egister
A
R eceive Data
UTO
ODE
Validation
Data falls to
Data fills to
Data Bit
Trigger=8
(RH R)
FIFO
14
Example
4
RTS F
14
: - RX FIFO trigger level selected at 8 bytes
LOW
RTS# re-asserts when data falls below the flow
control trigger level to restart remote transmitter.
Enable by EFR bit-6=1, MCR bit-1.
RTS# de-asserts when data fills above the flow
control trigger level to suspend remote transmitter.
Enable by EFR bit-6=1, MCR bit-1.
RHR Interrupt (ISR bit-2) programmed for
(See Note Below)
desired FIFO trigger level.
FIFO is Enabled by FCR bit-0=1
Validation
Data Bit
C
ONTROL
R H R Interrupt (ISR bit-2)
M
ODE
R eceive D ata C haracters
Receive Data Characters
R XFIFO 1
RXFIFO1
REV. 1.0.2