VSC7440 datasheet(186/444 Pages) MICROSEMI

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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

169

VCAP IS2 action REW_CMD defines the Delay_Req/Resp processing mode where two modes exist:

•

Generate Delay_Resp from Delay Req frame and update the receiveTimestamp in the PTP header

with the ingress PTP time stamp. Use the time stamp from the configured time domain

(ANA_ACL:PORT:PTP_CFG.PTP_DOMAIN). This time domain must match the selected time

domain on the ingress port (DEVxx::PTP_CFG.PTP_DOM)

•

Generate Delay_Resp from Delay Req frame and do not update the receiveTimestamp.

In addition to the VCAP IS2 action, the Delay_Req/Resp processing must also be enabled in ANA_ACL

(ANA_ACL::PTP_MISC_CTRL.PTP_ALLOW_ACL_REW_ENA).

In addition to updating the receiveTimestamp, the following PTP header modifications are done

independently of the Delay_Req/Resp processing mode:

•

messageType. The PTP messageType is set to 0x9 (Delay_Resp)

•

messageLength. The PTP messageLength is set to 0x54 and the frame is expanded with 10 bytes

to accomodate the requestingPortIdentity. If the frame expands beyond 148 bytes, then the frame is

discarded.

For PTP frames carried over UDP, the UDP length is increased with 10 bytes. It is mandatory that

the original UDP length is 44 bytes. For PTP frames carried over IPv4, the IP total length is

increased with 10 bytes.

•

flagField. Selected bits in the PTP flagField can be reconfigured using the per-PTP domain

configured flagField and flagField mask (ANA_ACL:PTP_DOM:PTP_MISC_CFG).

The PTP domain is selected using VCAP IS2 action PTP_DOM_SEL.

•

sourcePortIdentity. The sourcePortIdentity is constructed using a 64-bit clockIdentity and a 16-bit

portNumber. The clockIdentity is configurable per-PTP domain.

By default, the portNumber is set to a per-PTP domain configured value. In addition, it is selectable

to overwrite the six least significant bits with a per-port configured value.

The PTP domain is selected using VCAP IS2 action PTP_DOM_SEL.

•

controlField. The PTP controlField is set to 0x3.

•

logMessageInterval. The PTP logMessageInterval can be specified for multicast frames only with

new values ranging from –8 through 7. The new value is configured using VCAP IS2 actions

SWAP_MAC_ENA and LOG_MSG_INT.

This update can be globally disabled in

ANA_ACL::PTP_MISC_CTRL.PTP_DELAY_REQ_MC_UPD_ENA.

•

requestingPortIdentity. This fields is set to the incoming frame’s sourcePortIdentity.

For PTP frames carried over UDP, any PTP header modifications trigger the UDP checksum to be

updated for IPv6 frames and to be cleared for IPv4 frames.

ANA_ACL::PTP_MISC_CTRL

Enable Delay_Req/resp processing.

Enable logMessageInterval update for multicast

Delay_Resp frames.

None

ANA_ACL:PTP_DOM:PTP_CLOCK_ID_MSB PTP clockIdentity used in portIdentity.

Per PTP domain

ANA_ACL:PTP_DOM:PTP_CLOCK_ID_LSB

PTP clockIdentity used in portIdentity.

Per PTP domain

ANA_ACL:PTP_DOM:PTP_SRC_PORT_CFG PTP portNumber used in portIdentity.

Configuration of whether to use fixed portNumber

or per-port portNumber.

Per PTP domain

ANA_ACL:PTP_DOM:PTP_MISC_CFG

Configuration of flagField with associated mask.

The PTP domain is specified with VCAP IS2

action PTP_DOM_SEL.

Per PTP domain

Table 107 •

ANA_ACL PTP Processing and Rewriting Registers (continued)

Description

Replication

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