REV. 1.4.3 5V PCI BUS OCTAL UART 31 4.3.2 Receiver Operation in non-FIFO Mode 4.3.3 Receiver Operation in FIFO and Flow Control Mod" />
參數(shù)資料
型號(hào): XR17C158CV-0A-EVB
廠商: Exar Corporation
文件頁(yè)數(shù): 25/67頁(yè)
文件大小: 0K
描述: EVAL BOARD FOR XR17C158-A 144TQF
標(biāo)準(zhǔn)包裝: 1
系列: *
xr
XR17C158
REV. 1.4.3
5V PCI BUS OCTAL UART
31
4.3.2
Receiver Operation in non-FIFO Mode
4.3.3
Receiver Operation in FIFO and Flow Control Mode
FIGURE 12. RECEIVER OPERATION IN NON-FIFO MODE
FIGURE 13. RECEIVER OPERATION IN FIFO AND FLOW CONTROL MODE
Receive Data Shift
Register (RSR)
Receive
Data Byte
and Errors
RHR Interrupt (ISR bit-2)
Receive Data
Holding Register
(RHR)
RXFIFO1
16X or 8X Clock
(8XMODE Register)
Receive Data Characters
Data Bit
Validation
Error
Flags in
LSR bits
4:2
Receive Data Shift
Register (RSR)
RXFIFO1
16X or 8X Sampling
Clock (8XMODE Reg.)
E
rror
Fl
ag
s
(64-s
ets)
E
rro
rFl
ags
i
n
LS
R
bi
ts
4:2
64 bytes by 11-
bit wide FIFO
Receive Data Characters
FIFO Trigger=48
Example:
- FIFO trigger level set at 48 bytes
- RTS/DTR hyasteresis set at +/-8 chars.
Data fills to 56
Data falls to 40
Data Bit
Validation
Receive Data
FIFO
(64-byte)
Receive
Data
Receive Data
Byte and Errors
RHR Interrupt (ISR bit-2) is programmed
at FIFO trigger level (RXTRG).
FIFO is Enable by FCR bit-0=1
RTS#/DTR# de-asserts when data fills above
the trigger level to suspend remote transmitter.
Enable by EFR bit-6=1, MCR bit-2.
RTS#/DTR# re-asserts when data falls below
the trigger level to restart remote transmitter.
Enable by EFR bit-6=1, MCR bit-2.
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