CS4210 Datasheet, PDF (76/102 Pages) National Semiconductor (TI) – IEEE 1394 OHCI Controller

Register Descriptions (Continued)
4.4.19 Node ID and Status Register
This register contains the CSR address for the node on
which this chip resides. The 16-bit combination of busNum-
ber and nodeNumber is referred to as the Node ID. This
register is written autonomously and atomically by the
CS4210 with the value in CS4103’s base register at
Address 00h following the self-identification phase of bus
initialization. Although IntEvent.phyRegRcvd (BAR0+Offset
80h[26]) is not set when the contents of CS4103’s base
register at Address 00h are written here, software can use
the IntEvent.selfIDComplete (BAR0+Offset 80h[16]) inter-
rupt to detect that the self-identification phase has com-
pleted and can then check for a new valid Node ID.
Bit
31
30
29:28
27
26:16
15:6
5:0
Table 4-34. BAR0+Offset E8h: Node ID and Status Register
Name
iDValid
root
RSVD
CPS
RSVD
busNumber
nodeNumber
Access
RU
RU
--
RU
--
RWU
RU
Reset
0
0
0
0
0
3FFh
Undef
Description
ID Valid: This bit indicates whether or not the CS4210 has a valid node
number. It is cleared when the bus reset state is detected and set again
when the CS4210 receives a new node number from the CS4103.
If iDValid is clear, software should not set ContextControl.run for either of
the ATDMA contexts (request and response).
Root: This bit is set during the bus reset process if the CS4103 is root.
Reserved
Cable Power Status: Set if the CS4103 is reporting that cable power status
is OK (VP 8V).
Reserved
Bus Number: This number is used to identify the specific 1394 bus this
node belongs to when multiple 1394-compatible buses are connected via a
bridge. This field is set to 3FFh on a bus reset.
Node Number: This number is the physical node number established by
the CS4103 during self-identification. It is automatically set to the value
received from the CS4103 after the self-identification phase. If the CS4103
sets the nodeNumber to 63, software should not set ContextControl.run for
either of the ATDMA contexts (request and response).
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