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参数资料
| 型号： | XR21V1410IL16TR-F |
| 厂商： | Exar Corporation |
| 文件页数： | 29/30页 |
| 文件大小： | 0K |
| 描述： | IC USB UART FIFO FULL SPD 16QFN |
| 产品培训模块： | XR21V141x Full-Speed USB UART Family |
| 标准包装： | 3,000 |
| 特点： | * |
| 通道数： | 1，UART |
| FIFO's： | 128 字节，384 字节 |
| 规程： | USB 2.0 |
| 电源电压： | 2.97 V ~ 3.63 V |
| 带自动流量控制功能： | 是 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-VFQFN 裸露焊盘 |
| 供应商设备封装： | 16-QFN-EP（3x3） |
| 包装： | 带卷 (TR) |
| 配用： | 1016-1299-ND - EVAL BOARD FOR XR21V1410IL |
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XR21V1410
8
1-CH FULL-SPEED USB UART
REV. 1.4.0
FIGURE 3. NORMAL OPERATION RECEIVE DATA FORMAT
1.5.2.3
Wide mode receive operation with 7 or 8-bit data
Two bytes of data are loaded into the RX FIFO for each byte of data received. The first byte is the received
data. The second byte consists of the error bits and break status. Wide mode receive data format is shown in
Figure 4.
1.5.2.4
Wide mode receive operation with 9-bit data
Two bytes of data are loaded into the RX FIFO for each byte of data received. The first byte is the first 8 bits of
the received data. The 9th bit received is stored in the bit 0 of the second byte. The parity bit is not received /
checked. The remainder of the 2nd byte consists of the framing and overrun error bits and break status.
FIGURE 4. WIDE MODE RECEIVE DATA FORMAT
Error flags are also available from the ERROR_STATUS register and the interrupt packet, however these flags
are historical flags indicating that an error has occurred since the previous request. Therefore, no conclusion
can be drawn as to which specific byte(s) may have contained an actual error in this manner.
1.5.3
Rx FIFO Low Latency
In normal operation all bulk-in transfers will be of maxPacketSize (64) bytes to improve throughput and to
minimize host processing. When there are 64 bytes of data in the RX FIFO, the V1410 will acknowledge a
bulk-in request from the host and transfer the data packet. If there is less than 64 bytes in the RX FIFO, the
V1410 may NAK the bulk-in request indicating that data is not ready to transfer at that time. However, if there
is less than 64 bytes in the RX FIFO and no data has been received for more than 3 character times, the
V1410 will acknowledge the bulk-in request and transfer any data in the RX FIFO to the USB host.
In some cases, especially when the baud rate is low, this increases latency unacceptably. The V1410 has a
low latency register bit that will cause the V1410 to immediately transfer any received data in the RX FIFO to
1
ST byte
7, 8, or 9bit data
7 6 5 4 3 2 1 0
7=‘0’ in7bit mode
1st byte
2nd byte
9 bit mode
7
6
5
4
3
2
1
0
x
O F B P
1st byte
B = Break
F = Framing Error
O = Overrun Error
2nd byte
7 or 8 bit mode
P = Parity Error (= ‘0’ if not enabled)
7 = ‘0’ in 7 bit mode
x = ‘0’
7
6
5
4
3
2
1
0
x
O F B 8
B = Break
F = Framing Error
O = Overrun Error
x = ‘0’
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相关代理商/技术参数 |
参数描述 |
|---|---|
| XR21V1412 | 制造商:EXAR 制造商全称:EXAR 功能描述:2-CH FULL-SPEED USB UART |
| XR21V1412_10 | 制造商:EXAR 制造商全称:EXAR 功能描述:2-CH FULL-SPEED USB UART |
| XR21V1412IL-0A-EB | 功能描述:界面开发工具 EVAL BOARD FOR XR21V1412IL32-F 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 |
| XR21V1412IL-0B-EB | 功能描述:界面开发工具 For XR21V1412 QFN32 USB, RS232;No Cables 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 |
| XR21V1412IL32 | 制造商:EXAR 制造商全称:EXAR 功能描述:2-CH FULL-SPEED USB UART |
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