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| 型號： | UPD72852A |
| 廠商： | NEC Corp. |
| 英文描述： | IEEE1394a-2000 COMPLIANT 400 Mbps TWO-PORT PHY LSI |
| 中文描述： | 1個IEEE1394a 2000年的要求400 Mbps的雙端口PHY的大規(guī)模集成電路 |
| 文件頁數(shù)： | 34/48頁 |
| 文件大小： | 373K |
| 代理商： | UPD72852A |
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Data Sheet S16725EJ2V0DS
34
μ
PD72852A
5. CABLE PHY PACKET
The node on the serial bus transmits and receives the PHY packet to control the bus.
The PHY packet is composed of 2 quadlets (64-bit); the second quadlet (32-bit) contains the inverse value of the
first quadlet.
The PHY packet is transmitted at a transfer rate of S100. All of the PHY packets received from the serial bus are
transmitted to the Link.
Though the PHY packet from the
μ
PD72852A is transmitted to the Link, the PHY packet which was transmitted
from the Link of the node is not transmitted to the Link.
There are four types of PHY packets, as follows:
Self_ID packet
Link-on packet
PHY configuration packet
Extended PHY packet
The Self_ID packet transmitted automatically by the
μ
PD72852A is also transmitted to the Link of a local node.
The
μ
PD72852A PHY packet Receive from the serial bus operates similar to the PHY packet transmitted by the
Link (when the packet transmission to the Link is executed).
5.1 Self_ID Packet
During the Self_ID phase of the initialization or when the Ping packet responds, the
μ
PD72852A transmits the
Self_ID packet.
Figure 5-1. Self_ID Packet Format
10
phy_ID
0
L
gap_cnt
sp
rsv
c
pwr
p0
p1
p2
i
m
Logical Inverse of the first quadlet
Table 5-1. Self_ID Packet
Field
Description
phy_ID
Physical ID of the node.
L
Logical product of Link_active and LPS in the PHY register.
gap_cnt
Gap_count value in the PHY register.
sp
Physpeed 10 (corresponds to 98.304, 196.608, 393.216 Mbps).
c
C bit values in the PHY register.
pwr
pwr value in the PHY register.
000: The node does not need the power supply. No power repeat.
001: Obtains power supply for the node. Can supply 15 W or more.
010: Obtains power supply for the node. Can supply 30 W or more.
011: Obtains power supply for the node. Can supply 45 W or more.
100: The node consumes 3 W maximum power.
110: The node consumes 3 W maximum power. At least 3 W are necessary to enable Link.
111: The node consumes 3 W maximum power. At least 7 W are necessary to enable Link.
i
It shows that the node issued Bus Reset and the bus was reset.
m
Read as 0.
rsv
Read as 00.
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