VT6306 datasheet(42/59 Pages) VIA

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VT6306 PCI 1394a Host Controller

Revision 1.16 July 19, 2002

-36-

PHY Register Page 0 - Port Status

The Port Status page is used to access configuration and status

information for each of the PHY’s port. The port is selected by

writing zero to Page_select and the desired port number to

Port_select in the PHY register at address 0111.

Offset

1000b Disa

Bias Conn Child

Bstat

Astat

1001b

-reserved-

Fault IntEn

Negotiated Speed

1010b

-reserved-

1011b

-reserved-

1100b

-reserved-

1101b

-reserved-

1110b

-reserved-

1111b

-reserved-

Table 5. PHY Register Page 0 Bit Field Descriptions

Field

Bits Type Def Description

Astat

TPA line state for the port

00 = invalid

01 =1

10 =0

11 =z

Bstat

Same encoding as Astat

Child

1 indicates the port is a child, 0 a parent.

The meaning of this bit is undefined

from the time a bus reset is detected until

the chip transitions to state T1:Child

Handshake

during

the

tree

identify

process (see 4.4.2.2 in IEEE 1394-1995)

Conncted

One indicates the port is connected, zero

indicates it is disconnected. The value

reported by this bit is filtered by

hysteresis logic to reduce multiple status

changes caused by contact scrape when a

connector is inserted or removed.

Bias

One

indicates

that

bias

voltage

detected (possible connection).

The

value reported by this bit is filtered by

hysteresis logic to reduce multiple status

changes caused by contact scrape when a

connector is inserted or removed.

Disabled

When set to one, the port is disabled. The

value of this bit subsequent to a power

reset is implementation-dependent, but

should be a strappable option.

Negotiated

Speed

Indicates the maximum speed negotiated

between this port and its immediately

connected port.

000 – 98.304 Mbit/s

001 - and 196.608 Mbit/s

010 - and 393.216 Mbit/s

Interrupt

Enable

Enable port event interrupts. When set

to one, the chip sets Port_event to one if

any of Connected, Bias, Disabled or

Fault (for this port) change state.

Fault

Set to one if an error is detected during a

suspend or resume operation. A write of

one to this bit clears it to zero.

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