VSC7511 datasheet(51/324 Pages) MICROSEMI

51 / 324 page

Functional Descriptions

VMDS-10488 VSC7511 Datasheet Revision 4.2

3.5.1.1

Broadcast Write

The PHYs can be configured to accept MII PHY register write operations, regardless of the destination

address of these writes. This is enabled in PHY_CTRL_STAT_EXT::BROADCAST_WRITE_ENA. This

enabling allows similar configurations to be sent quickly to multiple PHYs without having to do repeated

MII PHY write operations. This feature applies only to writes; MII PHY register read operations are still

interpreted with “correct” address.

3.5.1.2

The PHY can be reset through software, enabled in PHY_CTRL::SOFTWARE_RESET_ENA. Enabling

this field initiates a software reset of the PHY. Fields that are not described as sticky are returned to their

default values. Fields that are described as sticky are only returned to defaults if sticky-reset is disabled

through PHY_CTRL_STAT_EXT::STICKY_RESET_ENA. Otherwise, they retain their values from prior to

the software reset. A hardware reset always brings all PHY registers back to their default values.

3.5.2

Cat5 Twisted Pair Media Interface

The twisted pair interfaces are compliant with IEEE 802.3-2008 and IEEE 802.3az for Energy Efficient

Ethernet.

3.5.2.1

Voltage-Mode Line Driver

Unlike many other gigabit PHYs, this PHY uses a patented voltage-mode line driver that allows it to fully

integrate the series termination resistors (required to connect the PHY’s Cat5 interface to an external 1:1

transformer). Also, the interface does not require placement of an external voltage on the center tap of

the magnetic. The following illustration shows the connections.

Figure 10 •

Cat5 Media Interface

TXVPA_

TXVNA_

TXVPB_

TXVNB_

TXVPC_

TXVNC_

TXVPD_

TXVND_

PHY Port_n

Transformer

A+

A–

B+

B–

C+

C–

D+

D–

RJ-45

1000 pF,

2 kV

0.1 µF

VSC7511 Datasheet(PDF) 51 Page - Microsemi Corporation

VSC7511 Datasheet(HTML) 51 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