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ADIN2111CCPZ-R7 数据表(PDF) 42 Page - Analog Devices |
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ADIN2111CCPZ-R7 数据表(HTML) 42 Page - Analog Devices |
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42 / 129 page  Data Sheet ADIN2111 SWITCH SPI analog.com Rev. A | 42 of 129 The ADIN2111 supports the following OPEN Alliance SPI capabili- ties. See the supported capabilities register (CAPABILITY) for more details: ► Transmit FCS validation ► Cut through ► IEEE 1588 time stamp capture on transmit and receive ► Minimum supported chunk size is 8 bytes The OPEN Alliance SPI protocol defines two types of transactions: data transactions for Ethernet frame transfers, and control transac- tions for register read/write operations. A chunk is the basic element of data transactions, and it is com- posed of four bytes of overhead plus the configured payload size. Data transactions consist of an equal number of transmit and receive chunks. Chunks in both transmit and receive directions may or may not contain valid frame data independent from each other, allowing for the simultaneous transmission and reception of different length frames. The data header of the chunk in transmit frames, and the data footer in receive frames, indicate which bytes of the payload contain valid frame data. For full information on the OPEN Alliance SPI protocol used by the ADIN2111, refer to OPEN Alliance 10BASE-T1x MACPHY serial interface Version 1.0. Note that CS must be deasserted between data transactions and control transactions, as shown in Figure 24. CHUNK 1 MULTIPLE CHUNKS WITHIN SPI DATA TRANSACTION MCU HW/FW TURN AROUND MCU HW/FW TURN AROUND SPI CONTROL TRANSACTION CHUNK 2 --- --- CHUNK x CONTROL READ CONTROL READ CHUNK 1 MOSI SCK CS MISO CHUNK 2 --- --- CHUNK x CONTROL READ CONTROL READ OR OR Figure 24. Ethernet Data Frame Transfer Followed by Control Transfer |
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