VSC8504-02 datasheet(46/131 Pages) MICROSEMI

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Functional Descriptions

VMDS-10507 VSC8504-02 Datasheet Revision 4.2

3.17.6.2 QSGMII Mode

When the MAC interface is configured in QSGMII mode, write the following 16-bit value to register 18G:

Bits 15:12 0x9

Bits 11:8: Port address (0x0)

Bits 7:4: Loopback type

Bits 3:0: 0x2

where loopback type is:

0x0: No loopback

0x2: Input loopback

0x4: Facility loopback

0x8: Equipment loopback

Note: Loopback configuration affects all ports associated with a QSGMII. Individual port loopback within a

QSGMII is not possible.

3.17.6.3 Fiber Media Port Mode

When the SerDes is configured as a fiber media port, write the following 16-bit value to register 18G:

Bits 15:12: 0x8

Bits 11:8: Port address

Bits 7:4: Loopback type

Bits 3:0: 0x2

where port address is:

0x1: Fiber0 port

0x2: Fiber1 port

0x4: Fiber2 port

0x8: Fiber3 port

Port addresses for fiber media SerDes can be OR'ed together to address multiple ports using a single

command. bit 18G.15 will be cleared when the internal configuration is complete.

3.17.6.4 Facility Loop

The recovered and de-multiplexer deserializer data output is looped back to the serializer data input and

replaces the data delivered by the digital core. This test loop provides the possibility to test the complete

analog macro data path from outside including input buffer, clock and data recovery, serialization and

output buffer. The data received by the input buffer must be transmitted by the output buffer after some

delay.

Additional configuration of the macro is required for facility loopback mode. When entering facility

loopback mode, the set = 1 option should be run; when exiting facility loopback mode, the set = 0 option

should be run.

PhyWrite(PhyBaseAddr, 31, 0x0010);

PhyWrite(PhyBaseAddr, 18, 0x8s03);

// where “s” is the physical address of the SerDes macro

PhyWrite(PhyBaseAddr, 18, 0xd7cb);

PhyWrite(PhyBaseAddr, 18, 0x8007);

tmp1 = PhyRead(PhyBaseAddr, 18);

tmp2 = tmp1 & 0x0ff0;

if (set)

tmp3 = tmp2 | 0x0010;

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