VT6508 datasheet(20/48 Pages) ETC1

20 / 48 page

VIA Technologies, Inc.

Preliminary VT6508 Datasheet

-20-

step2. Check the chip internal register, phyint_setup_reg, to setup the pause capability

(Reg4.10) and phy auto-negotiation enable (Reg0.12)

- if (this port do not need phy setup) and (phyint_setup_reg == done),

then go to step 10(done)

- else if (this port do not need phy setup) and (phyint_setup_reg != done),

then config ioctl, set phyint_setup_reg == done, go to step10(done)

- else if (phyint_setup_reg != done),

then go to step3(phy fc setup)

- else if (this port do not need auto-poll,

then go to step 10(done)

- else go to step 5(read phy link status)

step3. Phy flow_control ability setup

- if the phy_pause_ability(reg4.10) != port_phy_fc_set,

then write reg4.10 = port_phy_fc_set and go to step4 (phy auto-negotiation ability

setup)

- else go to step4 (phy auto-negotiation ability setup)

step4. PHY auto-negotiation ability setup

- if (Reg0.12)=”1”(on), then modify chip internal register for phyint_setup_reg = done;

go to step5

- else if (Reg0.12)=”0”(off) or phy_pause_ability have been modified ( in step3 ), then

write PHY auto-negotiation_enable bit (Reg0.12) =”1” (on), restart_auto-negotiation

bit (Reg0.9) = “1” and modify chip internal register for phyint_setup_reg = done; go to

step5

step5. Read PHY link_status bit (Reg1.2) 1

st time

- if link is down (Reg1.2)=”0”, then go to step6

- else if link is up (Reg1.2)=”1” and chip_internal_reg for link status is “down”, then go to

step7

- else if link is up (Reg1.2)=”1” and chip_internal_reg for link status is “up”, then go to

step10.

step6. Read PHY link_status bit (Reg1.2) 2

st time

- if link is up (Reg1.2)=”1”, then go to step7

- else if link is down (Reg1.2)=”0”, then go to step10

*if chip_internal_reg for link status is “down”=> generate link_change

interrupt and disable io_port

step7. Read PHY Auto-negotiation Complete bit (Reg1.5)

- if auto-negotiation is completed (Reg1.5)=”1”, then go to step8.

- else if auto-negotiation is not completed (Reg1.5)=”0”, then go to step10.

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