TSB41AB2PAPR datasheet(25/50 Pages) TI

25 / 50 page

TSB41AB2, TSB41AB2I

IEEE 1394a2000 TWOPORT CABLE

TRANSCEIVER/ARBITER

SLLS424G − JUNE 2000 − REVISED DECEMBER 2004

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

APPLICATION INFORMATION

Table 4. Page 0 (Port Status) Register Field Descriptions

FIELD

SIZE

TYPE

DESCRIPTION

Astat

TPA line state. This field indicates the TPA line state of the selected port, encoded as follows:

Code

Line State

invalid

Bstat

TPB line state. This field indicates the TPB line state of the selected port. This field has the same

encoding as the Astat field.

Child/parent status. A 1 indicates that the selected port is a child port. A 0 indicates that the selected port

is the parent port. A disconnected, disabled, or suspended port is reported as a child port. The Ch bit

is invalid after a bus reset until tree-ID has completed.

Con

Debounced port connection status. This bit indicates that the selected port is connected. The connection

must be stable for the debounce time of approximately 341 ms for the con bit to be set to 1. The con bit

is reset to 0 by hardware reset and is unaffected by bus reset.

NOTE: The con bit indicates that the port is physically connected to a peer PHY, but the port is not

necessarily active.

Bias

Debounced incoming cable bias status. A 1 indicates that the selected port is detecting incoming cable

bias. The incoming cable bias must be stable for the debounce time of 52

µs for the bias bit to be set

to 1.

Dis

Rd/Wr

Port disabled control. If 1, the selected port is disabled. The dis bit is reset to 0 by hardware reset (all

ports are enabled for normal operation following hardware reset). The dis bit is not affected by bus reset.

Peer_Speed

Port peer speed. This field indicates the highest speed capability of the peer PHY connected to the

selected port, encoded as follows:

Code

Peer Speed

000

S100

001

S200

010

S400

011–111

invalid

The Peer_Speed field is invalid after a bus-reset until self-ID has completed.

NOTE: Peer speed codes higher than 010b (S400) are defined in IEEE 1394a-2000. However, the

TSB41AB2 is only capable of detecting peer speeds up to S400.

PIE

Rd/Wr

Port event interrupt enable. When set to 1, a port event on the selected port sets the port event interrupt

(PEI) bit and notify the link. This bit is reset to 0 by hardware reset and is unaffected by bus reset.

Fault

Rd/Wr

Fault. This bit indicates that a resume-fault or suspend-fault has occurred on the selected port and that

the port is in the suspended state. A resume-fault occurs when a resuming port fails to detect incoming

cable bias from its attached peer. A suspend-fault occurs when a suspending port continues to detect

incoming cable bias from its attached peer. Writing 1 to this bit clears the bit to 0. This bit is reset to 0

by hardware reset and is unaffected by bus reset.

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