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| 型號： | HOME |
| 英文描述： | Home PHY Single-Chip 1/10Mbps Home Networking PHY? - (PDF) |
| 中文描述： | 首頁PHY的單芯片1/10Mbps家庭網(wǎng)絡(luò)物理層？ - （PDF格式） |
| 文件頁數(shù)： | 29/90頁 |
| 文件大小： | 743K |
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Am79C901A
29
P R E L I M I N A R Y
The operation field (OP) follows the start field (ST).
The OP indicates whether the operation is a read or a
write operation. The PHY address (PHYADD) and the
register address (REGADD) that were programmed
follow this. A bus turnaround field (TA) follows the RE-
GADD field. During the read operation, the bus TA
field is used to determine if the PHY is responding
properly to the read request. The final field is the idle
field, and it is required to allow the drivers to turn off.
The PHYADD field, which is five bits wide, allows 32
unique PHY addresses. The managed PHY layer de-
vice that is connected to a station management entity
via the MII interface has to respond to transactions ad-
dressed to the PHY
’
s address. A station management
entity attached to multiple PHYs is required to have
prior knowledge of the appropriate PHY address.
For more information, see the IEEE 802.3 specification
and the MII pin descriptions.
Figure 14.
MII Start of Transmission
TX_CLK
TX_EN
TXD
CRS
RX_CLK
RX_DV
RXD
55
Idle
Preamble
Data
D
55
55
55
D
2
COL
22304B-16
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