参数资料
| 型号： | XR17V258IV-F |
| 厂商： | Exar Corporation |
| 文件页数： | 17/69页 |
| 文件大小： | 0K |
| 描述： | IC UART PCI BUS OCTAL 144LQFP |
| 标准包装： | 60 |
| 特点： | * |
| 通道数： | 8 |
| FIFO's： | 64 字节 |
| 规程： | RS485 |
| 电源电压： | 3.3V，5V |
| 带自动流量控制功能： | 是 |
| 带IrDA 编码器/解码器： | 是 |
| 带故障启动位检测功能： | 是 |
| 带调制解调器控制功能： | 是 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 144-LQFP |
| 供应商设备封装： | 144-LQFP（20x20） |
| 包装： | 托盘 |
| 其它名称： | 1016-1470 XR17V258IV-F-ND |
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XR17V258
24
66MHZ PCI BUS OCTAL UART WITH POWER MANAGEMENT SUPPORT
REV. 1.0.2
1.6.6
SLEEP [31:24] (default 0x00)
SLEEP Register
Individual UART Channel Sleep Enable
Ch-6
Ch-7
Ch-5 Ch-4 Ch-3 Ch-2 Ch-1 Ch-0
Bit-7 Bit-6 Bit-5 Bit-4 Bit-3 Bit-2 Bit-1 Bit-0
The 8-bit Sleep register enables each UART separately to enter Sleep mode. Sleep mode reduces power
consumption when the system needs to put the UART(s) to idle. The UART enters sleep mode when the
following conditions are satisfied after the sleep mode is enabled (Logic 0 (default) is to disable and logic 1 is to
enable sleep mode):
■ There is no pending interrupt
■ RX pin is idling at a HIGH in normal mode or a LOW in infrared mode
■ The modem inputs (CTS#, DSR#, CD# and RI#) are steady at either HIGH or LOW (MSR bits [3:0] =
0x0)
When all 8 UART channels are put to sleep, the on-chip oscillator shuts off to further conserve power. In this
case, the V258 is awakened by any of the following events occurring at any of the 8 UART channels:
■ A receive data start bit transition (HIGH to LOW in normal mode or from LOW to HIGH in infrared mode)
■ A data byte is loaded into the transmitter
■ A change of logic state on any of the modem inputs, i.e. any of the delta bits (MSR bits[7:4]) is set
The V258 is ready after 32 crystal clocks to ensure full functionality. Therefore, if the V258 is awakened by a
receive data start bit transition, that character (and the subsequent few characters) may not be received
correctly. Also, a special interrupt is generated with an indication of no pending interrupt. The V258 will return
to sleep mode automatically after all interrupting conditions have been serviced and cleared. It will stay in the
sleep mode of operation until it is disabled by resetting the SLEEP register bits.
1.6.7
Device Identification and Revision
There are two internal registers that provide device identification and revision, DVID and DREV registers. The
8-bit content in the DVID register provides device identification. A return value of 0x48 from this register
indicates the device is a XR17V258. The DREV register returns an 8-bit value of 0x01 for revision A with 0x02
equals to revision B and so on. This information is very useful to the software driver for identifying which device
it is communicating with and to keep up with revision changes.
DVID [15:8]
Device identification for the type of UART. The Device ID of the XR17V258 is 0x48.
DREV [7:0]
Revision number of the XR17V258. A 0x01 represents "revision-A" with 0x02 for rev-B and so on.
REGB [23:16] (default 0x00)
REGB register provides a control for simultaneous write to all 8 UARTs configuration register or individually.
This is very useful for device initialization in the power up and reset routines. Also, the register provides a
facility to interface to the non-volatile memory device such as a 93C46 EEPROM. In embedded applications,
the user can use this facility to store proprietary data in an external EEPROM.
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相关代理商/技术参数 |
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| XR17V258IVTR-F | 功能描述:UART 接口集成电路 66MHz Octal PCI UART RoHS:否 制造商:Texas Instruments 通道数量:2 数据速率:3 Mbps 电源电压-最大:3.6 V 电源电压-最小:2.7 V 电源电流:20 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:LQFP-48 封装:Reel |
| XR17V352 | 制造商:EXAR 制造商全称:EXAR 功能描述:HIGH PERFORMANCE DUAL PCI EXPRESS UART |
| XR17V352IB-0A-EVB | 功能描述:界面开发工具 Eval Board for XR17V352IB Series RoHS:否 制造商:Bourns 产品:Evaluation Boards 类型:RS-485 工具用于评估:ADM3485E 接口类型:RS-485 工作电源电压:3.3 V |
| XR17V352IB113-F | 功能描述:UART 接口集成电路 2 Channel PCIe UART w/256 Byte FIFO RoHS:否 制造商:Texas Instruments 通道数量:2 数据速率:3 Mbps 电源电压-最大:3.6 V 电源电压-最小:2.7 V 电源电流:20 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:LQFP-48 封装:Reel |
| XR17V354 | 制造商:EXAR 制造商全称:EXAR 功能描述:HIGH PERFORMANCE QUAD PCI-EXPRESS UART |
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