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參數(shù)資料
| 型號(hào)： | SBPH400-3 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | IEEE1394 3-Port 400Mbps Physical Layer |
| 中文描述： | IEEE1394連接3端口400Mbps的物理層 |
| 文件頁數(shù)： | 13/43頁 |
| 文件大小： | 285K |
| 代理商： | SBPH400-3 |
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SBPH400-3
13/43
Figure 2.4
PHY configuration packet format
The fields in the PHY configuration packet are interpreted as shown in Table 2.2.
Note that either or both of R and T must be set to 1.
2.7.5 Ping packet
The SBPH400 supports the use of pingtiming. The ping packet has the format shownin Figure
2.5:
Figure 2.5
Ping packet format
When the SBPH400 receives a ping packet from the bus or from the local link addressed to
the node, it responds immediately (without arbitration) with a Self_ID packet to both the bus
and the local link.
2.7.6 Remote Access and Reply
The SBPH supports remote access to its internal registers. On receipt of a remote access
packet addressed to the node (either from the bus or from the local link), the SBPH400 will
immediatelyrespond with the appropriate remote reply packet. The remote access packet and
the reply packet are also forwarded to the local link.
Table 2.2
PHY configuration packet fields
Field
root_ID
R
Definition
physical ID
set root
Comment
the physical node identifier of the node to become root on next reset
The Force_Root bit in the SBPH400 is set if R=1 and root_ID = the
node_ID of this node
If T=1, then the value ofthe gap count register inthe SBPH400 is set
to gap_cnt.
new value of Gap Count register
T
set gap count
gap_cnt
Gap_Count value
0 0
root_ID
logical inverse of first quadlet
R
0000
0000
0000
0000
T
gap_cnt
0 0
phy_ID
logical inverse of first quadlet
0
0000
0000
0000
0000
0
00
type (0)
2
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