VSC7440 datasheet(298/444 Pages) MICROSEMI

298 / 444 page

Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

281

The following table lists how to configure squelch for possible recovered clock sources (configured in

SYNC_ETH_CFG[n].SEL_RCVRD_CLK_SRC).

When squelching, the clock will stop when it detects a loss of signal (or PLL lock). The clock will stop on

either on high or low level.

3.29

Hardware Time Stamping

Hardware time stamping provides nanosecond-accurate frame arrival and departure time stamps, which

are used to obtain high precision timing synchronization and timing distribution, as well as significantly

better accuracy in performance monitoring measurements than what is obtained from pure software

implementations.

The hardware time stamping functions operate in both standalone devices and in systems where multiple

devices are interconnected to form a multichip system.

Figure 83 •

Supported Time Stamping Flows

Hardware time stamping can update PTP frames coming from a standard front port without any 1588

support or from a partner device that does parts of the timing update. Each port is configured according

to the partner device attached.

Table 212 •

Squelch Configuration for Sources

SRC

Associated Squelch Configuration

4-8

Set SERDES1G_COMMON_CFG.SE_AUTO_SQUELCH_ENA in SD macro to enable squelch when

receive signal is lost. SD1G macro index is (SRC-4).

9-10

Set SERDES6G_COMMON_CFG.SE_AUTO_SQUELCH_ENA in SD macro to enable squelch when

receive signal is lost. SD6G macro-index is (SRC-9).

14-17

Set SYNC_ETH_SD10G_CFG[(SRC-14)].SD10G_AUTO_SQUELCH_ENA to enable squelch when

receive signal is lost.

Set SYNC_ETH_PLL_CFG[0].PLL_AUTO_SQUELCH_ENA to enable squelch when PLL loses lock.

Set SYNC_ETH_PLL_CFG[1].PLL_AUTO_SQUELCH_ENA to enable squelch when PLL2 loses lock.

1588-enabled

Switch or PHY

Device

Interconnect

Front Port

1588-enabled

Switch or PHY

VSC7440 Datasheet(PDF) 298 Page - Microsemi Corporation

VSC7440 Datasheet(HTML) 298 Page - Microsemi Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL