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VSC7511 Datasheet(PDF) 154 Page - Microsemi Corporation |
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VSC7511 Datasheet(HTML) 154 Page - Microsemi Corporation |
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154 / 324 page  Functional Descriptions VMDS-10488 VSC7511 Datasheet Revision 4.2 139 The following table shows the resulting rewriter actions for the one-step PTP action, depending on the add/subtract mode and ingress and egress backplane mode settings. All actions associated with one-step or origin can be disabled per egress port through REW:PORT:PTP_CFG.PTP_1STEP_DIS. The following table shows the resulting rewriter actions for the two-step PTP action, depending on the ingress and egress backplane mode settings. All actions associated with two-step can be disabled per egress port through REW:PORT:PTP_CFG.PTP_2STEP_DIS. Table 110 • PTP Time Stamping for One-step PTP PTP Action (from IS2) Add/Subtract Ingress Backplane Egress Backplane PTP time stamp Rewriter Actions One-step Disabled Disabled Disabled Residence time: Adds frame’s residence time to PTP correction field. Egress port delay is added to correction field if specified by IS2. One-step Disabled Disabled Enabled Sets reserved bytes: Writes frame’s Rx time stamp into the reserved bytes. One-step Disabled Enabled Disabled Residence time: Adds frame’s residence time to PTP correction field. Egress port delay is added to correction field if specified by IS2. Clear reserved bytes. One-step Disabled Enabled Enabled Does not apply. One-step Enabled Disabled Disabled Residence time: Adds frame’s residence time to PTP correction field. Egress port delay is added to correction field if specified by IS2. One-step Enabled Disabled Enabled Add/subtract: Subtracts frame’s Rx time stamp from PTP correction field. One-step Enabled Enabled Disabled Add/subtract: Adds frame’s Tx time stamp to PTP correction field. Egress port delay is added to correction field if specified by IS2. Clear reserved bytes. One-step Enabled Enabled Enabled Does not apply. Table 111 • PTP Time Stamping for Two-step PTP PTP action (from IS2) Ingress Backplane Egress Backplane PTP time stamp Rewriter Actions Two-step Disabled Disabled Saves Tx time stamp in PTP time stamp queue. Two-step Disabled Enabled Sets reserved bytes: Write the frame’s Rx time stamp into the reserved bytes. Two-step Enabled Disabled Saves Tx time stamp in PTP time stamp queue. Clear reserved bytes. Two-step Enabled Enabled Does not apply. |
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