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Os motores de busca de Datasheet de Componentes eletrônicos |
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Os motores de busca de Datasheet de Componentes eletrônicos |
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ADIN2111CCPZ-R7 Folha de dados(PDF) 47 Page - Analog Devices |
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ADIN2111CCPZ-R7 Folha de dados(HTML) 47 Page - Analog Devices |
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47 / 129 page  Data Sheet ADIN2111 SWITCH SPI analog.com Rev. A | 47 of 129 32 BITS UNPROTECTED: 32 × (LEN + 1) BITS PROTECTED: 2 × 32 × (LEN + 1) BITS 32 BITS 32 BITS 32 BITS UNPROTECTED: 32 × (LEN + 1) BITS PROTECTED: 2 × 32 × (LEN + 1) BITS MOSI SCK CS MISO CONTROL HEADER RX CHUNK DATA (DISCARD) ECHOED CONTROL HEADER REGISTER WRITE DATA × (LEN + 1) ECHOED REGISTER WRITE DATA × (LEN + 1) IGNORED Figure 29. OPEN Alliance Control Transaction Control Read The MACPHY ignores all data from the SPI host following the control header for the rest of the control read command. Control read commands can read either a single register or multiple registers. When multiple registers are read, the address is automatically post incremented, according to the address increment disable bit in the control header. 32 BITS 32 BITS RX CHUNK DATA (DISCARD) ECHOED CONTROL HEADER IGNORED CONTROL HEADER REGISTER READ DATA × (LEN + 1) UNPROTECTED: 32 × (LEN + 1) BITS PROTECTED: 2 × 32 × (LEN + 1) BITS MOSI SCK CS MISO Figure 30. Control Read Transaction OPEN Alliance SPI Errors See the following OPEN Alliance SPI errors: ► SPI header parity error. If a parity error is detected on a transmit header and there is a transmit frame in the process of transfer- ring over the SPI, this frame drops. If the switch is operating in cut through mode, the frame transmit stops and a bad CRC is appended to the frame. The ADIN2111 returns a fixed value of 0x4000_0000 in every word until CS goes high. The ADIN2111 responds with DV = 1, EV = 1, EBO = 0, and FD = 1 in the first data footer following a new assertion of CS. If there is a parity error on a control transaction, the operation does not complete. Software can determine which transaction caused the error as the ADIN2111 returns a fixed 0x4000_0000 on SDO for the duration of the SPI transaction. Software can then resend the corrupted control transaction after clearing the header error bit. ► Transmit protocol error. Occurs when the ADIN2111 detects pro- tocol errors in the transfer of transmit data chunks. These errors are usually due to SPI host firmware issues and do not occur in normal operation. The transmit protocol error bit is set when a data header received by the ADIN2111 indicates data valid (DV = 1) without a prior start of frame indication (SV = 1), in which case the data chunk is ignored. Or, when the ADIN2111 receives two data headers indicating a start of frame (SV = 1) without an end of frame (EV = 1), the ADIN2111 drops the frame data from the previous start of frame indicator and begins accepting the frame data from the second start of frame indicator. ► Transmit buffer overflow. Occurs when attempting to write trans- mit frame data to the ADIN2111 when there is no transmit buffer |
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