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參數(shù)資料
| 型號： | UPD72852GB-8EU |
| 廠商： | NEC Corp. |
| 英文描述： | MOS INTEGRATED CIRCUIT |
| 中文描述： | 馬鞍山集成電路 |
| 文件頁數(shù)： | 33/48頁 |
| 文件大小： | 249K |
| 代理商： | UPD72852GB-8EU |
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Data Sheet S14920EJ3V0DS
33
μ
PD72852
5.2 Link-on Packet
The
μ
PD72852 outputs the Link-on signal of 6.144 MHz from the pin LKON when receiving the Link-on packet.
Figure 5-2. Link-on Packet Format
01
phy_ID
0000
0000
0000
0000
0000
0000
Logical Inverse of the first quadlet
Table 5-2. Link-on Packet
Field
Description
phy_ID
Physical_ID of the destination of the Link-on packet
5.3 PHY Configuration Packet
Use the PHY configuration packet to set the gap count for the bus.
Figure 5-3. PHY Configuration Packet Format
00
root_ID
R
T
gap_cnt
0000
0000
0000
0000
Logical Inverse of the first quadlet
Table 5-3. PHY Configuration Packet
Field
Description
root_ID
Sets the Physical_ID node as root contender (for the next reset).
R
When this bit is set to 1 and the Phyisical_ID of the node corresponds to the rootID of this packet, the
μ
PD72852 sets the force_root bit. The force_root bit is cleared if there is discrepancy.
T
If this bit is 1, the gap_cnt value of this packet is used as the gap_count value. The gap_count value
must not be cleared by the following bus reset, set the gap_count_reset_disable flag in the
μ
PD72852 to
TRUE.
gap_cnt
When this packet is received, the gap count is set to this value. While it remains effective for the next
bus reset, it will be cleared by the second bus reset to 3FH.
Remark
Applying 0 to both R,T, regards the following packets as extended PHY packets, the PHY configuration is
not recognized.
5.4 Extended PHY Packet
An extended PHY packet is defined when both the R (in the PHY configuration packet) and T bits are transmitted
as 0. The extended PHY packet does not influence the force_root_bit and the gap_count bit on any node.
Following are the types of extended PHY packets:
Ping packet
Remote access packet
Remote reply packet
Remote command packet
Remote confirmation packet
Resume packet
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