VSC8504-02 datasheet(45/131 Pages) MICROSEMI

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Functional Descriptions

VMDS-10507 VSC8504-02 Datasheet Revision 4.2

When using the connector loopback testing feature, the device autonegotiation, speed, and duplex

configuration is set using device registers 0, 4, and 9. For 1000BASE-T connector loopback, the

following additional writes are required. Execute the additional writes in the following order:

Enable the 1000BASE-T connector loopback. Set register bit 24.0 to 1.

Disable pair swap correction. Set register bit 18.5 to 1.

3.17.6

SerDes Loopbacks

For test purposes, the SerDes and SerDes macro interfaces provides several data loops. The following

illustration shows the SerDes loopbacks.

Figure 35 •

Data Loops of the SerDes Macro

3.17.6.1 SGMII Mode

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

Bits 15:12 0x9

Bits 11:8: Port address (0x0 to 0x3)

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

DES

n:1

SER

1:n

D Q >

RC-PLL

Analo g Services M o dules

(BIAS, clk tree buffers,

ESD protection )

n bit IF

SLIVER

D igital interface , co nfiguratio n, and co ntro l

lo gic including synchro no us Ethernet clo ck tree

Facility Loop

HS-ref. clo ck

Equipm ent-Loop

Input-Lo o p

Pad-Lo o p

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