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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AM79C901AVCT 데이터시트(PDF) 29 Page - Advanced Micro Devices |
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AM79C901AVCT 데이터시트(HTML) 29 Page - Advanced Micro Devices |
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29 / 90 page  Am79C901A 29 PR ELI M IN AR 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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