P-Tile Avalon® Streaming Intel® FPGA IP for PCI Express* 用户指南

ID 683059
日期 4/04/2024
Public
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5.2.3.13. 电源管理(Power Management)

表 103.  电源管理
参数 默认值 说明
Enable L0s acceptable latency

Maximum of 64 ns

Maximum of 128 ns

Maximum of 256 ns

Maximum of 512 ns

Maximum of 1 us

Maximum of 2 us

Maximum of 4 us

No limit

Maximum of 64 ns

此设计参数指定应用层能够容忍的器件与根复合体之间的任何链路退出L0s状态的最大可接受延迟。此参数设置Device Capabilities Register(0x084)的Endpoint L0s可接受延迟域的只读值。

该Endpoint不支持L0s和L1状态。然而,在一个切换的系统时,可能存在链路与已使能L0s和L1的切换开关连接。设置此参数以允许系统配置软件为系统中所有器件读取可接受延迟,并为每个链路读取退出延迟从而决定用于使能Active State Power Management (ASPM)的链路。

此设置对于Root Ports是禁用的。

此参数的默认值为64 ns。对于大多数设计而言,这是最安全的设置。

Endpoint L1 acceptable latency

Maximum of 1 us

Maximum of 2 us

Maximum of 4 us

Maximum of 8 us

Maximum of 16 us

Maximum of 32 us

Maximum of 64 us

No limit

Maximum of 1 us

This value indicates the acceptable latency that an Endpoint can withstand in the transition from the L1 state to L0 state. It is an indirect measure of the Endpoint’s internal buffering. It sets the read-only value of the Endpoint L1 acceptable latency field of the Device Capabilities Register.

This Endpoint does not support the L0s or L1 states. However, a switched system may include links connected to switches that have L0s and L1 enabled. This parameter is set to allow system configuration software to read the acceptable latencies for all devices in the system and the exit latency for each link to determine which links can enable Active State Power Management (ASPM).

此设置对于Root Ports是禁用的。