UDC920BE 3BHE034863R0001工控模块系统备件
规范适用于DPI设备：
•主机状态信息仅在登录后发送到外围设备，至少每125毫秒发送一次（发送到所有连接的外围设备）。如果超过250毫秒没有响应，外围设备将超时。实际时间取决于连接的外围设备的数量。最小时间目标为5毫秒（可能取决于端口波特率）。DPI在125k时允许最小5ms状态，在500k时允许最小1ms状态。•主机根据连接的外围设备的数量确定最小更新时间（MUT）。值范围从2到125 ms。最小目标时间为5 ms。DPI允许在500k时为2 ms，在125k时为5 ms最小值。•状态改变时生成的外围命令消息（包括数据链路），但速度不超过主机MUT，至少每250毫秒一次。如果超过500毫秒，主机将超时。•发送对等消息请求的速度不能超过MUT的2倍。
外围设备
•主机必须至少每2秒ping一次每个端口。如果超过3秒，外围设备将等待时间。主机将等待最多10毫秒（125k）或5毫秒（500k）的外围设备响应ping。外围设备的典型响应时间为1毫秒。外围设备一次只允许一个挂起的显式消息（ping响应或对等请求）。•对显式请求或片段的响应必须在1秒内发生，否则设备将超时（适用于主机或外围设备）。超时意味着从头开始重试。每个事务的最大碎片数为16。闪存例外，允许22个碎片。•在Flash模式下，主机停止ping，但仍支持状态/以1…5秒的速率发送命令消息。驱动器将使用1秒速率。
Specifications apply to DPI equipment:
• Host status information is only sent to peripherals after login, at least once every 125 milliseconds (to all connected peripherals). If there is no response for more than 250 milliseconds, the peripheral will time out. The actual time depends on the number of peripherals connected. The minimum time target is 5 milliseconds (may depend on the port baud rate). The minimum 5ms state is allowed for DPI at 125k, and the minimum 1ms state is allowed for DPI at 500k. • The host determines the minimum update time (MUT) based on the number of peripherals connected. Values range from 2 to 125 ms. The minimum target time is 5 ms. DPI allows 2 ms at 500k and a minimum of 5 ms at 125k. • Peripheral command messages (including data links) generated when the status changes, but the speed does not exceed the host MUT, at least once every 250 milliseconds. If it exceeds 500 milliseconds, the host will timeout. • The speed of sending peer message requests cannot exceed twice that of MUT.
Peripherals
• The host must ping each port at least every 2 seconds. If it exceeds 3 seconds, the peripheral will wait for time. The host will wait up to 10 milliseconds (125k) or 5 milliseconds (500k) for peripheral devices to respond to ping. A typical response time for peripherals is 1 ms. Peripherals allow only one pending explicit message (ping response or peer request) at a time. • The response to an explicit request or fragment must occur within 1 second, or the device will time out (for hosts or peripherals). Timeout means to retry from the beginning. The maximum number of fragments per transaction is 16. Flash memory exception, 22 fragments allowed. • In Flash mode, the host stops ping, but still supports status/sending command messages at a rate of 1... 5 seconds. The drive will use a 1-second rate.
