参数资料
| 型号： | XR21V1414IM48-F |
| 厂商： | Exar Corporation |
| 文件页数： | 34/34页 |
| 文件大小： | 0K |
| 描述： | IC UART FIFO USB QUAD 48TQFP |
| 产品培训模块： | UART Product Overview XR21V141x Full-Speed USB UART Family |
| 特色产品： | XR21V141x Full-Speed USB UART |
| 标准包装： | 250 |
| 特点： | * |
| 通道数： | 1，UART |
| FIFO's： | 128 字节 |
| 规程： | USB 2.0 |
| 电源电压： | 3.3V |
| 带自动流量控制功能： | 是 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-TQFP |
| 供应商设备封装： | 48-TQFP（7x7） |
| 包装： | 托盘 |
| 配用： | 1016-1303-ND - EVAL BOARD FOR XR21V1414IM |
| 其它名称： | 1016-1304 |
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XR21V1414
9
REV. 1.3.0
4-CH FULL-SPEED USB UART
1.0
FUNCTIONAL DESCRIPTIONS
1.1
USB interface
The USB interface of the V1414 is compliant with the USB 2.0 Full-Speed Specifications. The USB
configuration model presented by the V1414 to the device driver is compatible to the Abstract Control Model of
the USB Communication Device Class (CDC-ACM). The V1414 uses the following set of parameters:
1 Control Endpoint
■ Endpoint 0 as outlined in the USB specifications
1 Configuration is supported
2 interfaces per UART channel
■ Each UART channel has a single interrupt endpoint
■ Each UART channel have bulk-in and bulk-out endpoints
1.1.1
USB Vendor ID
Exar’s USB Vendor ID is 0x04E2. This is the default Vendor ID that is used for the V1414 unless a valid
EEPROM is present on the I2C interface signals. If a valid EEPROM is present, the Vendor ID from the
EEPROM will be used.
1.1.2
USB Product ID
The default USB Product ID for the V1414 is 0x1414. If a valid EEPROM is present, the Product ID from the
EEPROM will be used. Note that Exar’s custom drivers for all Windows OS require that the Product ID be an
even number for the V1414 device for proper identification of the device.
1.2
USB Device Driver
The V1414 device can be used with either a standard CDC-ACM driver or a custom driver. When the CDC-
ACM driver is used, the driver has no capability to read or write the V1414 device registers. Because of this,
the V1414 device is initialized to the settings in Table 1. With a custom driver, all GPIOs default in hardware to
inputs but these settings may be modified by the custom driver.
Note that when using a CDC-ACM driver, the V1414 will automatically change the bMaxPacketSize to 63 bytes
to compensate for a known issue with the Microsoft CDC-ACM device driver. A register is available to change
this setting with a custom driver as well. See “Section 3.4.1, CUSTOM Register Description (Read/Write)”
on page 28. Although there is no ability to read / write registers when using the CDC-ACM driver, basic UART
functions, including setting baud rate, character format and sending line break are supported by the CDC
driver. Refer to the 4 CDC_ACM_IF USB Control Commands listed in Table 4, “Supported USB Control
Commands,” on page 16.
TABLE 1: V1414 REGISTER DEFAULTS WITH CDC-ACM DRIVER
REGISTER
VALUE
NOTES
FLOW_CONTROL
0x01
Hardware flow control
GPIO_MODE
0x01
RTS / CTS flow control
GPIO_DIRECTION
0x08
GPIO3/DTR# configured as an output
GPIO_INT_MASK
0x30
GPIO0/RI#, GPIO1/CD# and GPIO2/DSR# are interrupt sensi-
tive, i.e. can cause a USB interrupt to be generated
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| 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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