REV. 1.0.3 2.0 FUNCTIONAL DESCRIPTIONS 2.1 CPU Interface
參數(shù)資料
型號： XR16V2551IM-0B-EB
廠商： Exar Corporation
文件頁數(shù)： 48/49頁
文件大?。?/td> 0K
描述： EVAL BOARD FOR V2551 48TQFP
標準包裝： 1
系列： *
XR16V2551
8
HIGH PERFORMANCE DUART WITH 16-BYTE FIFO AND POWERSAVE FEATURE
REV. 1.0.3
2.0 FUNCTIONAL DESCRIPTIONS
2.1
CPU Interface
The CPU interface is 8 data bits wide with 3 address lines and control signals to execute data bus read and
write transactions. The V2551 data interface supports the Intel compatible types of CPUs and it is compatible
to the industry standard 16C550 UART. No clock (oscillator nor external clock) is required to operate a data
bus transaction. Each bus cycle is asynchronous using CSA#/CSB#, IOR# and IOW# or CS#, R/W# and A3
inputs. Both UART channels share the same data bus for host operations. A typical data bus interconnection
for Intel and Motorola mode is shown in Figure 3.
FIGURE 3. XR16V2551 TYPICAL INTEL/MOTOROLA DATA BUS INTERCONNECTIONS
VCC
OP2A#
DSRA#
CTSA#
RTSA#
DTRA#
RXA
TXA
RIA#
CDA#
OP2B#
DSRB#
CTSB#
RTSB#
DTRB#
RXB
TXB
RIB#
CDB#
GND
A0
A1
A2
UART_CSA#
UART_CSB#
IOR#
IOW #
D0
D1
D2
D3
D4
D5
D6
D7
A0
A1
A2
CSA#
CSB#
D0
D1
D2
D3
D4
D5
D6
D7
IOR#
IOW #
UART
Channel A
UART
Channel B
UART_INTB
UART_INTA
INTB
INTA
RXRDYA#
TXRDYA#
RXRDYA#
TXRDYA#
RXRDYB#
TXRDYB#
RXRDYB#
TXRDYB#
UART_RESET
RESET
Serial Interface of
RS-232, RS-422
Serial Interface of
RS-232, RS-422
(no connect)
2.25 to 3.6 Volt VCC
VCC
OP2A#
DSRA#
CTSA#
RTSA#
DTRA#
RXA
TXA
RIA#
CDA#
OP2B#
DSRB#
CTSB#
RTSB#
DTRB#
RXB
TXB
RIB#
CDB#
GND
A0
A1
A2
UART_CS#
A3
R/W #
D0
D1
D2
D3
D4
D5
D6
D7
A0
A1
A2
CSA#
CSB#
D0
D1
D2
D3
D4
D5
D6
D7
IOR#
IOW #
UART
Channel A
UART
Channel B
UART_IRQ#
INTB
INTA
RXRDYA#
TXRDYA#
RXRDYA#
TXRDYA#
RXRDYB#
TXRDYB#
RXRDYB#
TXRDYB#
RESET#
VCC
UART_RESET#
(no connect)
VCC
Intel Data Bus Interconnections
Motorola Data Bus Interconnections
Serial Interface of
RS-232, RS-422
Serial Interface of
RS-232, RS-422
2.2
5-Volt Tolerant Inputs
The V2551 can accept up to 5V inputs even when operating at 3.3V or 2.5V. But note that if the V2551 is
operating at 2.5V, its VOH may not be high enough to meet the requirements of the VIH of a CPU or a serial
transceiver that is operating at 5V.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
XR16V2551IM-F 功能描述:UART 接口集成電路 UART RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel
XR16V2551IMTR-F 制造商:Exar Corporation 功能描述:UART 2-CH 16Byte FIFO 2.5V/3.3V 48-Pin TQFP T/R 制造商:Exar Corporation 功能描述:XR16V2551IMTR-F
XR16V2552 制造商:EXAR 制造商全稱:EXAR 功能描述:HIGH PERFORMANCE DUART WITH 16-BYTE FIFO
XR16V2552_07 制造商:EXAR 制造商全稱:EXAR 功能描述:HIGH PERFORMANCE DUART WITH 16-BYTE FIFO
XR16V2552IJ 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述:
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