Datasheet

TSB12LV32 Data Formats
81
SGLS139B − October 2003 − Revised April 2004 TSB12LV32-EP
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.
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:
sp
00 98.304 Mbps
01 98.304 Mbps and 196.608 Mbps
10 98.304 Mbps, 196.608 Mbps, and 393.216 Mbps
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:
pwr
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 standaraization.
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:
p0–p15
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 immediately follows (i.e., if this bit is set and the next Self-ID packet received has a
different Phy_ID, the 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-2000 specification; this packet can also enable
application layers.
‡
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.