• Switch Downstream Ports and Root Ports acting as PTM Responders must respond to each PTM Request Message received at their Downstream Ports with either PTM Response or PTM ResponseD according to the following rules: ◦ A PTM Responder must not send a PTM Response or PTM ResponseD Message without first receiving a PTM Request Message. ◦ Upon receipt of a PTM Request Message, a PTM Responder must attempt to issue a PTM Response or PTM ResponseD Message within 10 μs. ◦ A PTM Responder must issue PTM Response when the Downstream Port does not have valid historical timestamps (t3 - t2) with which to fulfill a PTM Request Message. 翻译
时间: 2024-04-28 07:26:55 浏览: 5
• 作为 PTM Responders 的 Switch Downstream Ports 和 Root Ports 必须根据以下规则响应其收到的每个 PTM Request Message,使用 PTM Response 或 PTM ResponseD: ◦ PTM Responder 必须在先收到 PTM Request Message 后才能发送 PTM Response 或 PTM ResponseD Message。 ◦ 在收到 PTM Request Message 后,PTM Responder 必须在 10 微秒内尝试发出 PTM Response 或 PTM ResponseD Message。 ◦ 当 Downstream Port 没有有效的历史时间戳(t3 - t2)来满足 PTM Request Message 时,PTM Responder 必须发出 PTM Response。
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• PTM Responders must populate PTM ResponseD Messages as follows (refer to Figure 6-24 and the accompanying implementation note): ◦ The PTM Master Time field is a 64-bit value containing the value of PTM Master Time at the receipt of the PTM Request Message for the current PTM Dialog. In Figure 6-24 , for the 2nd PTM dialog, this is the PTM Master Time at time t2’. ◦ The Propagation Delay field is a 32-bit value containing the interval between the receipt of the PTM Request Message and the transmission of the PTM Response Message for the previous PTM dialog. In Figure 6-24 , for the 2nd PTM dialog, this is the time interval between t2 and t3 captured during the 1st PTM dialog. ◦ The unit of measurement for both fields is one ns. ◦ A PTM Responder with multiple Downstream Ports must populate all PTM ResponseD Messages with values from a single PTM Root across all its PTM Ports Downstream ports. 翻译
• PTM Responders 必须按照以下方式填充 PTM ResponseD Messages(参考图 6-24 和相应的实现说明): ◦ PTM Master Time 字段是一个 64 位值,包含当前 PTM Dialog 的 PTM Master Time 值。在图 6-24 中,对于第二个 PTM dialog,这是 t2' 时刻的 PTM Master Time。 ◦ Propagation Delay 字段是一个 32 位值,包含收到 PTM Request Message 和发送前一个 PTM dialog 的 PTM Response Message 之间的间隔。在图 6-24 中,对于第二个 PTM dialog,这是在第一个 PTM dialog 期间捕获的 t2 和 t3 之间的时间间隔。 ◦ 两个字段的单位均为 1 ns。 ◦ 具有多个 Downstream Ports 的 PTM Responder 必须使用来自单个 PTM Root 的值填充所有 PTM Ports Downstream 端口上的所有 PTM ResponseD Messages。
• Support for the PTM Responder role is indicated by setting the PTM Responder Capable bit in the PTM Capability register. • Switches and Root Complexes are permitted to implement the PTM Responder Role. ◦ A PTM capable Switch, when enabled for PTM by setting the PTM Enable bit in the PTM Control register associated with the Switch Upstream Port, must respond to all PTM Request Messages received at any of its Downstream Ports. ◦ The mechanism by which Root Complexes communicate PTM Master Time to RCiEPs is implementation specific. 翻译
• 支持 PTM Responder 角色需要在 PTM Capability 寄存器中设置 PTM Responder Capable 位。 • Switches 和 Root Complexes 允许实现 PTM Responder 角色。 ◦ PTM capable Switch,在通过设置与 Switch Upstream Port 相关的 PTM Control 寄存器的 PTM Enable 位启用 PTM 后,必须响应其所有 Downstream Ports 收到的所有 PTM Request Messages。 ◦ Root Complexes 将 PTM Master Time 传递给 RCiEPs 的机制是实现特定的。