xr16m780 Exar Corporation, xr16m780 Datasheet - Page 17

• Manufacturer Part Number: xr16m780
• Description: 1.62v To 3.63v High Performance Uart With 64-byte Fifo
• Manufacturer: Exar Corporation

REV. 1.0.0
F
F
IGURE
IGURE
11. R
12. R
R eceive D ata
16X or 8X or 4X C lock
Byte and Errors
64 bytes by 11-bit w ide
( D LD [5:4] )
ECEIVER
ECEIVER
16X or 8X or 4X Clock
FIFO
( DLD[5:4] )
and Errors
Data Byte
Receive
O
O
PERATION IN NON
PERATION IN
R eceive D ata Shift
R egister (R SR )
LSR bits
D ata FIFO
Tags in
FIFO
R eceive
Error
R eceive
4:2
D ata
1.62V TO 3.63V HIGH PERFORMANCE UART WITH 64-BYTE FIFO
-FIFO M
Receive Data Shift
AND
Register (RSR)
Holding Register
Receive Data
A
UTO
ODE
(RHR)
V alidation
D ata falls to
Trigger=16
D ata Bit
D ata fills to
FIFO
56
E xam ple
8
RTS F
17
: - R X FIFO trigger level selected at 16 bytes
LOW
R TS# re-asserts w hen data falls below the flow
control trigger level to restart rem ote transm itter.
Enable by EFR bit-6=1, M C R bit-1.
Validation
R TS# de-asserts w hen data fills above the flow
control trigger level to suspend rem ote transm itter.
Enable by EFR bit-6=1, M C R bit-1.
Data Bit
R H R Interrupt (IS R bit-2) program m ed for
(See N ote Below )
desired FIFO trigger level.
FIFO is Enabled by F C R bit-0=1
C
ONTROL
RHR Interrupt (ISR bit-2)
M
ODE
Receive Data Characters
R eceive D ata C haracters
RXFIFO1
XR16M780
R X FIFO 1