Datasheet

4–28

4.32 Node Identification Register

The node identification register contains the address of the node on which the iOHCI-Lynx chip resides and

indicates the valid node number status. The 16-bit combination of the busNumber field (bits 15–6) and the

NodeNumber field (bits 5–0) is referred to as the node ID. See Table 4–24 for a complete description of the register

contents.

Bit 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16

Name Node identification

Type RU RU R R RU R R R R R R R R R R R

Default 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Name Node identification

Type RWU RWU RWU RWU RWU RWU RWU RWU RWU RWU RU RU RU RU RU RU

Default 1 1 1 1 1 1 1 1 1 1 X X X X X X

Offset: E8h

Type: Read/Write/Update, read/update, read-only

Default: 0000 FFXXh

Table 4–24. Node Identification Register Description

BIT FIELD NAME TYPE DESCRIPTION

31 iDValid RU Bit 31 indicates whether or not the TSB43AB23 device has a valid node number. It is cleared when a

1394 bus reset is detected and set to 1 when the TSB43AB23 device receives a new node number

from its PHY layer.

30 root RU Bit 30 is set to 1 during the bus reset process if the attached PHY layer is root.

29–28 RSVD R Reserved. Bits 29 and 28 return 0s when read.

27 CPS RU Bit 27 is set to 1 if the PHY layer is reporting that cable power status is OK.

26–16 RSVD R Reserved. Bits 26–16 return 0s when read.

15–6 busNumber RWU This field identifies the specific 1394 bus the TSB43AB23 device belongs to when multiple

1394-compatible buses are connected via a bridge.

5–0 NodeNumber RU This field is the physical node number established by the PHY layer during self-identification. It is

automatically set to the value received from the PHY layer after the self-identification phase. If the PHY

layer sets the nodeNumber to 63, software must not set bit 15 (run) in the asynchronous context control