Datasheet

4–17
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
Logical inverse of first quadlet
phy_ID10 1 n(1) rsv p11 p12 p13 p14 p15 reserved
Packet
Identifier
Figure 4–26. PHY Self-ID Packet #2 Format
Table 4–12. PHY Self-ID Packet Fields
FIELD NAME DESCRIPTION
phy_ID The phy_ID field contains the physical identification of the node transmitting the self-ID packet.
L If set, this node has an active link and transaction layers.
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 98.304 Mbits/s
01 98.304 Mbits/s and 196.608 Mbits/s
10 98.304 Mbits/s 196.608 Mbits/s, and 393.216 Mbits/s
11 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 Node does not need power and does not repeat power.
001 Node is self-powered and provides a minimum of 15 W to the bus.
010 Node is self-powered and provides a minimum of 30 W to the bus.
011 Node is self-powered and provides a minimum of 45 W to the bus.
100 Node may be powered from the bus and is using up to 3 W. No additional power is needed to
enable the link
†
.
101 Reserved for future standardization
110 Node is powered from the bus and is using up to 3 W. An additional 3 W is needed to enable the
link
†
.
111 Node is powered from the bus and is using up to 3 W. An additional 7 W is needed to enable the
link
†
.
p0 – p15
The p0 – p15 field indicates the port connection status. The code is:
00 Not present on the current PHY
01 Not connected to any other PHY
10 Connected to the parent node
11 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 Reserved and set to all zeros.
†
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.
‡
There is no guarantee that exactly one node will have this bit set. More than one node may request a bus reset at the
same time.