REV. 1.3.0 4-CH FULL-SPEED USB UART 1.3.1.3 Device Attributes The Device Attributes value replaces the bmAttributes " />
參數(shù)資料
型號(hào)： XR21V1414IM-0A-EB
廠商： Exar Corporation
文件頁(yè)數(shù)： 3/34頁(yè)
文件大?。?/td> 0K
描述： EVAL BOARD FOR XR21V1414IM
產(chǎn)品培訓(xùn)模塊： UART Product Overview
XR21V141x Full-Speed USB UART Family
標(biāo)準(zhǔn)包裝： 1
主要目的： 接口，USB 2.0 至 UART
嵌入式： 否
已用 IC / 零件： XR21V1414IM
已供物品： 板
相關(guān)產(chǎn)品： 1016-1304-ND - IC UART FIFO USB QUAD 48TQFP
其它名稱(chēng)： 1016-1303
XR21V1414
11
REV. 1.3.0
4-CH FULL-SPEED USB UART
1.3.1.3
Device Attributes
The Device Attributes value replaces the bmAttributes field in the USB Standard Configuration Descriptor. The
default setting in the V1414 device is 0xA0. The bit field definitions are:
Bit 7 is reserved - set to ’1’
Bit 6 is Self-powered mode - set to ’0’ for bus-powered, set to ’1’ for self-powered
Bit 5 is Remote Wakeup support - set to ’0’ for no support, set to ’1’ for remote wakeup support
Bit 4:0 are reserved - set to ’0’
1.3.1.4
Device Maximum Power
The Device Maximum Power value replaces the bMaxPower field in the USB Standard Configuration
Descriptor. The value specified is in units of 2 mA. For example, the value 0x2F is decimal 47 or 94 mA. Note
that the default bMaxPower of the V1414 device is 94 mA.
1.4
UART Manager
The UART Manager enables/disables each UART including the TX and RX FIFOs for each UART. The UART
Manager is located in a separate register block from the 4 UART channels.
1.5
UART
There are 4 enhanced UART channels in the V1414. Each UART channel is independent, therefore, they will
need to be initialized and configured independently. Each UART can be configured via USB control transfers
from the USB host. At power-up, the V1414 will default to 9600 bps, 8 data bits, no parity bit, 1 stop bit, and no
flow control. If a standard CDC driver accesses the V1414, defaults will change. See ”Section 1.2, USB
Device Driver” on page 9.
1.5.1
Transmitter
The transmitter consists of a 128-byte TX FIFO and a Transmit Shift Register (TSR). Once a bulk-out packet
has been received and the CRC has been validated, the data bytes in that packet are written into the TX FIFO
of the specified UART channel. Data from the TX FIFO is transferred to the TSR when the TSR is idle or has
completed sending the previous data byte. The TSR shifts the data out onto the TX output pin at the data rate
defined by the CLOCK_DIVISOR and TX_CLOCK_MASK registers.
The transmitter sends the start bit
followed by the data bits (starting with the LSB), inserts the proper parity-bit if enabled, and adds the stop-
bit(s). The transmitter can be configured for 7 or 8 data bits with or without parity or 9 data bits without parity.
If 9 bit data is selected without wide mode, the 9th bit will always be ’0’.
1.5.1.1
Wide Mode Transmit
When both 9 bit data and wide mode are enabled, two bytes of data must be written. The first byte that is
loaded into the TX FIFO are the first 8 bits (data bits 7-0) of the 9-bit data. Bit-0 of the second byte that is
loaded into the TX FIFO is bit-8 of the 9-bit data. The data that is transmitted on the TX pin is as follows: start
bit, 9-bit data, stop bit. Use the WIDE_MODE register to enable wide mode.
1.5.2
Receiver
The receiver consists of a 384-byte RX FIFO and a Receive Shift Register (RSR). Data that is received in the
RSR via the RX pin is transferred into the RX FIFO. Data from the RX FIFO is transferred to the USB host in
response to a Bulk-In request. Depending on the mode, error / status information for that data character may
or may not be stored in the RX FIFO with the data.
1.5.2.1
Normal receive operation with 7 or 8-bit data
Data that is received is stored in the RX FIFO. Any parity, framing or overrun error or break status information
related to the data is discarded. Receive data format is shown in Figure 3.
1.5.2.2
Normal receive operation with 9-bit data
The first 8 bits of data received is stored in the RX FIFO. The 9th bit as well as any parity, framing or overrun
error or break status information related to the data is discarded.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
XR21V1414IM-0B-EB 功能描述:界面開(kāi)發(fā)工具 For XR21V1414 TQFP48 USB, RS232;No Cables RoHS:否 制造商:Bourns 產(chǎn)品:Evaluation Boards 類(lèi)型:RS-485 工具用于評(píng)估:ADM3485E 接口類(lèi)型:RS-485 工作電源電壓:3.3 V
XR21V1414IM48 制造商:EXAR 制造商全稱(chēng):EXAR 功能描述:4-CH FULL-SPEED USB UART
XR21V1414IM48-F 功能描述:USB 接口集成電路 4-Ch 12Mbps 48MHz Internal clock; UART RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類(lèi)型:SPI 工作電源電壓:3.15 V to 3.45 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WLCSP-20
XR21V1414IM48-F 制造商:Exar Corporation 功能描述:IC QUAD UART 12MBPS 3.63V 48-TQFP
XR21V1414IM48TR-F 制造商:Exar Corporation 功能描述:USB-to-UART 4-CH 128Byte FIFO 48-Pin TQFP T/R 制造商:Exar Corporation 功能描述:XR21V1414 Series 12 Mbps 3.63 V Quad Channel USB UART SMT - TQFP-48 制造商:Exar Corporation 功能描述:XR21V1414IM48TR-F 制造商:EXAR 功能描述:USB-to-UART 4-CH 128Byte FIFO 48-Pin TQFP T/R
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