VT6306 datasheet(47/59 Pages) VIA

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VT6306 PCI 1394a Host Controller

Revision 1.16 July 19, 2002

-41-

Functional Descriptions

Support to PHY Packet

The VT6306 PHY will forward to the link (if the internal link layer is active) every PHY packet received on the bus. It will

interpret every PHY packet which it receives from the local link device for transmission on the bus (in addition to responding to

every PHY packet received from the bus). The VT6306 PHY will act on it in exactly the same way as if the packet was received

from the bus.

Self-ID Packet

The Self-ID packet has the format shown in Figure 6 and the fields in the Self-ID packet are derived as shown in Table 8.

Note: Bit 0 (the lsb) is on the left in the above diagram

Figure 6. Self-ID Packet Format

Table 8. Self ID Packet Fields

Field Definition Meaning

phy_ID

Physical node identifier

Link enabled register Logical AND of PHYLPS signal and the Link_active register

gap_cnt

Gap_Count register current value of Gap Count register

Max_Phy_Speed is 10b (S100, S200 and S400 capable)

Contender register current value of C register

Pwr

Power class register current value of Power class register

p0, p1, p2

p0, p1, p2 port status for port 0, 1, and 2 respectively.

01 - not active (disabled, disconnected or suspended)

10 – active and connected to parent node

11 – active and connected to child node

Initiated reset set whenever the node initiated the current bus reset

Link-On Packet

The VT6306 PHY will respond to a Link_on packet addressed to it received on the bus. The packet has the format shown below in

Figure 7 If the logical AND of the PHYLPS pin and the Link_active bit is zero, then the PHY will generate a 6.144 MHz signal on

the PHYLON pin, until this logical value becomes 1. Otherwise the packet is forwarded to the local link. Note that all Link_on

packets received on the bus are forwarded to the local link if it is active, whether or not the packets are addressed to the local node.

Note: Bit 0 (the lsb) is on the left in the above diagram

Figure 7. Link_on Packet Format

VT6306 Datasheet(PDF) 47 Page - VIA Technologies, Inc.