7
–
15
Table 7
–
15. Phy Self-ID Packet Fields
FIELD
NAME
DESCRIPTION
10
The 10 field is the self-ID packet identifier.
L
If set, this node has an active link and transaction layers. In discrete Phy implementations, this shall be the
logical AND of Link_active and LPS active.
gap_cnt
The gap_cnt field contains the current value for the current node PHY_CONFIGURATION.gap_count
field.
sp
The sp field contains the Phy speed capability. The code is:
00
01
10
11
98.304 Mbits/s
98.304 Mbits/s and 196.608 Mbits/s
98.304 Mbits/s 196.608 Mbits/s, and 393.216 Mbits/s
Extended speed capabilities reported in Phy register 3
c
If set and the link_active flag is set, this node is contender for the bus or isochronous resource manager as
described in clause 8.4.2 of IEEE Std 1394
–
1995.
pwr
Power consumption and source characteristics:
000
001
010
011
100
Node does not need power and does not repeat power.
Node is self-powered and provides a minimum of 15W to the bus.
Node is self-powered and provides a minimum of 30W to the bus.
Node is self-powered and provides a minimum of 45W to the bus.
Node may be powered from the bus and is using up to 3W. No additional power is needed to enable
the link
.
Reserved for future standaraization.
Node is powered from the bus and is using up to 3W. An additional 3W is needed to enable the link
.
Node is powered from the bus and is using up to 3W. An additional 7W is needed to enable the link
.
101
110
111
p0
–
p15
The p0
–
p15 field indicates the port connection status. The code is:
00
01
10
11
Not present on the current Phy
Not connected to any other Phy
Connected to the parent node
Connected to the child node
i
If set, this node initiated the current bus reset (i.e., it started sending a bus_reset signal before it received
one)
.
m
If set, another self-ID packet for this node will immediately follow (i.e., if this bit is set and the next Self-ID
packet received has a different Phy_ID, the a self-ID packet was lost)
n
Extended self-ID packet sequence number
rsv
There is no way to ensure that exactly one node has this bit set. More than one node can be requesting a bus reset at
the same time.
The link is enabled by the link-on Phy packet described in clause 7.5.2 of the IEEE 1394.a spec.; this packet may also
enable application layers.
Reserved and set to all zeros