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ADIN1110CCPZ-R7 数据表(PDF) 36 Page - Analog Devices |
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ADIN1110CCPZ-R7 数据表(HTML) 36 Page - Analog Devices |
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36 / 107 page  Data Sheet ADIN1110 MAC SPI analog.com Rev. B | 36 of 107 Transmit Data Header Table 31. Transmit Data Header D31 D30 D29 D28 to D24 D23 to D22 D21 D20 D19 to D16 D15 D14 D13 to D8 D7 to D6 D5 to D1 D0 1 SEQ NORX RSVD VS DV SV SWO RSVD EV EBO TSC RSVD P See the following definitions: ► SEQ: data chunk sequence. The sequence functionality is not supported by the ADIN1110. This bit must be set to 0. ► NORX: no receive flag. The SPI host can set this bit to indicate to the MAC-PHY that it does not process receive frame data that is in the current receive data chunk. For normal operation, set NORX to 0 to indicate that it accepts and process any receive frame data within the current chunk. ► VS: vendor specific bits. This two bits need to be set to 00 by the host. ► DV: data valid flag. The SPI host uses this bit to indicate if the current chunk contains valid transmit data (DV = 1) or not. When this bit is 0, the MAC-PHY ignores the chunk payload. ► SV: start valid flag. When this bit is 1, the beginning of an Ethernet frame is present in the current transmit data chunk payload. The SV bit is not to be confused with the start of frame delimiter (SFD) byte described in IEEE Standard 802.3. ► SWO: start word offset. When SV is 1, this field contains the 32-bit word offset into the transmit data chunk payload that points to the start of the new Ethernet frame. If SV is 0, the host must write this field as 0. ► EV: end valid flag. When this bit is 1, the end of an Ethernet frame is present in the current transmit data chunk payload. ► EBO: end byte offset. When EV is 1, this field contains the byte offset into the transmit data chunk payload that points to the last byte of the Ethernet frame to transmit. If EV is 0, the host must write this field as 0. ► TSC: time stamp capture. Request a time stamp capture when the frame is transmitted onto the network. See the following: ► 00: no action. ► 01: capture in the pair of TTSCAL and TTSCAH registers. The TTSCAA bits in the STATUS0 register assert when captured. ► 10: capture in the pair of TTSCBL and TTSCBH registers. The TTSCAB bits in the STATUS0 register assert when captured. ► 11: capture in the pair of TTSCCL and TTSCCH registers. The TTSCAC bits in the STATUS0 register assert when captured. ► P: parity. Parity bit calculated over the transmit data header. Method is odd parity. ► RSVD: reserved. Always set to 0. |
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