xr17d152im Exar Corporation, xr17d152im Datasheet - Page 29

• Manufacturer Part Number: xr17d152im
• Description: Universal 3.3v And 5v Pci Bus Dual Uart
• Manufacturer: Exar Corporation

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REV. 1.2.0
F
F
5.3.2
5.3.3
IGURE
IGURE
Receive Data
Byte and Errors
(8 X M O D E R e g is t e r )
16X or 8X Sampling
Clock (8XMODE Reg.)
14. R
15. R
a n d E rr o rs
D a ta B y te
1 6 X o r 8 X C lo c k
R e c e iv e
Receiver Operation in non-FIFO Mode
Receiver Operation with FIFO
64 bytes by 11-
bit wide FIFO
ECEIVER
ECEIVER
O
O
PERATION IN NON
PERATION IN
L S R b its
T a g s in
Receive Data Shift
E r ro r
Register (RSR)
3 :1
Receive Data
Receive
(64-byte)
R e c e iv e D a ta S h ift
FIFO
FIFO
Data
R e g is te r (R S R )
H o ld in g R e g is t e r
-FIFO M
R e c e iv e D a ta
AND
(R H R )
F
Data falls to 40
FIFO Trigger=48
Data fills to 56
Validation
LOW
Data Bit
ODE
Example:
- FIFO trigger level set at 48 bytes
- RTS/DTR hyasteresis set at +/-8 chars.
C
29
ONTROL
UNIVERSAL (3.3V AND 5V) PCI BUS DUAL UART
RTS#/DTR# re-asserts when data falls below the
trigger level to restart remote transmitter.
Enable by EFR bit-6=1, MCR bit-2.
RTS#/DTR# de-asserts when data fills above
the trigger level to suspend remote transmitter.
Enable by EFR bit-6=1, MCR bit-2.
V a lid a t io n
D a ta B it
RHR Interrupt (ISR bit-2) is programmed at
FIFO trigger level (RXTRG).
FIFO is Enable by FCR bit-0=1
M
ODE
R H R I n te r ru p t (IS R b it -2 )
Receive Data Characters
R e c e iv e D a t a C h a ra c te r s
RXFIFO1
XR17D152