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VSC7511 Datasheet(PDF) 37 Page - Microsemi Corporation |
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VSC7511 Datasheet(HTML) 37 Page - Microsemi Corporation |
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37 / 324 page  Functional Descriptions VMDS-10488 VSC7511 Datasheet Revision 4.2 22 The Rx time stamp follows the frame to the rewriter where it can be used to calculate the frame’s residence time or it can be sent to the CPU together with the frame. The Tx time stamp is used by the rewriter to calculate the frame’s residence time or it can be written to a time stamp FIFO queue accessible by the CPU. For more information about hardware time stamping, see Configuring I/O Delays, page 157. 3.2.2 PCS This section provides information about the Physical Coding Sublayer (PCS) block, where the auto-negotiation process establishes mode of operation for a link. The PCS supports both SGMII mode and two SerDes modes, 1000BASE-X and 100BASE-FX. The following table lists the registers associated with PCS. The PCS is enabled in PCS1G_CFG.PCS_ENA and supports both SGMII and 1000BASE-X SERDES mode (PCS_MODE_CFG.SGMII_MODE_ENA), as well as 100BASE-FX. For information about enabling 100BASE-FX, see 100BASE-FX, page 24. The PCS also supports the IEEE 802.3, Clause 66 unidrectional mode, where the transmission of data is independent of the state of the receive link (PCS_MODE_CFG.UNIDIR_MODE_ENA). 3.2.2.1 Auto-Negotiation Auto-negotiation is enabled in PCS1G_ANEG_CFG.ANEG_ENA. To restart the auto-negotiation process, PCS1G_ANEG_CFG.ANEG_RESTART_ONE_SHOT must be set. The advertised word for the auto-negotiation process (base page) is configured in PCS1G_ANEG_CFG.ADV_ABILITY. The next page information is configured in PCS1G_ANEG_NP_CFG.NP_TX. When the auto-negotiation state machine has exchanged base page abilities, the PCS1G_ANEG_STATUS.PAGE_RX_STICKY is asserted indicating that the link partner’s abilities were received (PCS1G_ANEG_STATUS.LP_ADV_ABILITY). If next page information is exchanged, PAGE_RX_STICKY must be cleared, next page abilities must be written to PCS1G_ANEG_NP_CFG.NP_TX, and PCS1G_ANEG_NP_CFG.NP_LOADED_ONE_SHOT must be set. When the auto-negotiation state machine has exchanged the next page abilities, the PCS1G_ANEG_STATUS.PAGE_RX_STICKY is asserted again, indicating that the link partner’s next page abilities were received (PCS1G_ANEG_STATUS.LP_NP_RX). Additional exchanges of next page information are possible using the same procedure. Table 10 • PCS Configuration Registers Registers Description Replication PCS1G_CFG PCS configuration Per PCS PCS1G_MODE_CFG PCS mode configuration Per PCS PCS1G_SD_CFG Signal detect configuration Per PCS PCS1G_ANEG_CFG Configuration of the PCS auto-negotiation process Per PCS PCS1G_ANEG_NP_CFG Auto-negotiation next page configuration Per PCS PCS1G_LB_CFG Loop-back configuration Per PCS PCS1G_ANEG_STATUS Status signaling of the PCS auto-negotiation process Per PCS PCS1G_ANEG_NP_STATUS Status signaling of the PCS auto-negotiation next page process Per PCS PCS1G_LINK_STATUS Link status Per PCS PCS1G_LINK_DOWN_CNT Link down counter Per PCS PCS1G_STICKY Sticky bit register Per PCS |
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