VSC7440 datasheet(305/444 Pages) MICROSEMI

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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

288

3.29.8.1 VCAP IS2 Actions

In the analyzer, the VCAP IS2 actions are related to PTP operation. The REW_CMD action field

determines the PTP actions in the rewriter.

3.29.8.2 Rewriter Registers

The following table lists registers associated with time stamping.

Table 218 •

PTP Actions in Rewriter

Action Bits

Description

1-0: PTP command

0: No operation.

1: One-step.

2: Two-step.

3: Time of day.

3-2: Delay command

0: Do not add any delays.

1: Add PTP_EDLY(Tx port).

2: Add PTP_IDLY1(Rx port).

3: Add PTP_IDLY2(Rx port).

5-4: Sequence number and

time stamp command

0: No operation.

1: Sequence update. The rewriter contains a table of 256 sequence numbers which can

be selected by the lower bits of the time stamp field from the IFH. If this command bit is

set, the selected sequence number is put into the PDU, and the sequence will be

incremented by one. Feature only makes sense when frame is injected by the CPU, in

which case the IFH can be fully controlled by injecting with IFH.

2-3: Delay_Req/Delay_Resp processing. These modes are handled in the analyzer. This

is used for automatic response generation without involving software. If bits 1-0 are set to

one-step, the rewriter is requested to update the CF field to the time of reception.

6: SMAC to DMAC

If set, copy the SMAC into the DMAC of the frame.

7: Configuration to SMAC

If set, set the SMAC to the PTP SMAC configured per egress port.

Table 219 •

Rewriter Registers

Description

PTP_MODE_CFG

Assign time domain and PTP port mode for each port.

PTP_EDLY_CFG

PTP_IDLY1_CFG

PTP_IDLY2_CFG

Configure ingress and egress optional delays to use per port.

PTP_SMAC_LSB

PTP_SMAC_MSB

Configure the optional SMAC to replace in the PDUs.

PTP_MISC_CFG

Disable UDP checksum updating per port.

PTP_TWOSTEP_CTRL

Get next time stamp from FIFO.

PTP_TWOSTEP_STAMP

Next time stamp value.

PTP_CPUVD_MODE_CFG Set mode and time domain for CPU and virtual device ports.

PTP_RSRV_NOT_ZERO

Sticky bit for incoming non-zero reserved bytes field.

PTP_SEQ_NO

Set or get sequence number for 256 flows.

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