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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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VSC7440 датащи(PDF) 57 Page - Microsemi Corporation |
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VSC7440 датащи(HTML) 57 Page - Microsemi Corporation |
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57 / 444 page  Functional Descriptions VMDS-10492 VSC7440 Datasheet Revision 4.2 40 3.9.3 Physical Coding Sublayer (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 an SGMII mode and two SerDes modes, 1000BASE-X and 100BASE-FX. The following table lists the registers associated with the PCS. The PCS is enabled in PCS1G_CFG.PCS_ENA and PCS1G_MODE_CFG.SGMII_MODE_ENA selects between the SGMII and SerDes mode. For information about enabling 100BASE-FX, see 100BASE-FX. The PCS supports the IEEE 802.3, Clause 66 unidirectional mode, where the transmission of data is independent of the state of the receive link (PCS1G_MODE_CFG.UNIDIR_MODE_ENA). 3.9.3.1 Auto-Negotiation Auto-negotiation is enabled with PCS1G_ANEG_CFG.ANEG_ENA. To restart the auto-negotiation process, PCS1G_ANEG_CFG.ANEG_RESTART_ONE_SHOT must be set. In SGMII mode (PCS1G_MODE_CFG.SGMII_MODE_ENA = 1), matching the duplex mode with the link partner must be ignored (PCS1G_ANEG_CFG.SW_RESOLVE_ENA). Otherwise the link is kept down when the auto-negotiation process fails. 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 need to be exchanged (only available in SerDes model, that is, PCS1G_MODE_CFG.SGMII_MODE_ENA = 0), 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. Next page engagement is coded in bit 15 of Base Page of Next page information. Table 13 • DEV1G and DEV2G5 PCS Configuration Registers Overview Register 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 Auto-negotiation configuration register Per PCS PCS1G_ANEG_NP_CFG Auto-negotiation next page configuration Per PCS PCS1G_LB_CFG Loopback configuration Per PCS PCS1G_ANEG_STATUS Status signaling of 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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