參數(shù)資料
型號(hào): XR17C152CM-F
廠商: Exar Corporation
文件頁數(shù): 21/62頁
文件大小: 0K
描述: IC UART PCI BUS DUAL 100TQFP
標(biāo)準(zhǔn)包裝: 90
特點(diǎn): *
通道數(shù): 2,DUART
FIFO's: 64 字節(jié)
規(guī)程: RS485
電源電壓: 5V
帶自動(dòng)流量控制功能:
帶IrDA 編碼器/解碼器:
帶故障啟動(dòng)位檢測(cè)功能:
帶調(diào)制解調(diào)器控制功能:
安裝類型: 表面貼裝
封裝/外殼: 100-TQFP
供應(yīng)商設(shè)備封裝: 100-TQFP(14x14)
包裝: 托盤
XR17C152
á
5V PCI BUS DUAL UART
REV. 1.2.0
28
4.3.3
Receiver Operation with FIFO
4.4
Automatic Hardware (RTS/CTS or DTR/DSR) Flow Control Operation
Automatic hardware RTS/CTS or DTR/DSR flow control is used to prevent data overrun to the local receiver
FIFO and remote receiver FIFO. The RTS#/DTR# output pin is used to request the remote unit to suspend/
restart data transmission while the CTS#/DSR# input pin is monitored to suspend/restart the local transmitter.
The auto RTS/CTS or DTR/DSR flow control features are individually selected to fit specific application
requirement and enabled through EFR bit-6 and 7 and MCR bit-2 for either RTS/CTS or DTR/DSR control
signals.
Auto RTS flow control must be started by asserting the RTS# output pin LOW (MCR bit-1 = 1). Similarly, Auto
DTR flow control must be started by asserting the DTR# output pin LOW (MCR bit-0 = 1). Figure 14 shows in
detail how automatic hardware flow control works.
FIGURE 13. RECEIVER OPERATION IN FIFO AND FLOW CONTROL MODE
TABLE 10: AUTO RTS/CTS OR DTR/DSR FLOW CONTROL SELECTION
MCR BIT-2
EFR BIT-7
EFR BIT-6
HARDWARE FLOW CONTROL SELECTION
0
1
X
Auto CTS Flow Control Enabled
0
X
1
Auto RTS Flow Control Enabled
1
X
Auto DSR Flow Control Enabled
1
X
1
Auto DTR Flow Control Enabled
X
0
No Hardware Flow Control
Receive Data Shift
Register (RSR)
RXFIFO1
16X or 8X Sampling
Clock (8XMODE Reg.)
E
rror
Tags
(64-sets)
E
rror
Tags
i
n
LS
R
bits
3:1
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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