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FUSB302BMPX bảng dữ liệu(PDF) 29 Page - ON Semiconductor |
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FUSB302BMPX bảng dữ liệu(HTML) 29 Page - ON Semiconductor |
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29 / 32 page  FUSB302B www.onsemi.com 29 Table 41. TOKENS USED IN FIFO Code Name Size (Bytes) Description 101x−xxx1 (0xA1) TXON 1 Alternative method for starting the transmitter with the TX−START bit. This is not a token written to the TxFIFO but a command much like TX_START but it is more convenient to write it while writing to the TxFIFO in one contiguous write operation. It is preferred that the TxFIFO is first written with data and then TXON or TX_START is executed. It is expected that A1h will be written for TXON not any other bits where x is non-zero such as B1h, BFh, etc 0x12 SOP1 1 When reaching the end of the FIFO causes a Sync−1 symbol to be transmitted 0x13 SOP2 1 When reaching the end of the FIFO causes a Sync−2 symbol to be transmitted 0x1B SOP3 1 When reaching the end of the FIFO causes a Sync−3 symbol to be transmitted 0x15 RESET1 1 When reaching the end of the FIFO causes a RST−1 symbol to be transmitted 0x16 RESET2 1 When reaching the end of the FIFO causes a RST−2 symbol to be transmitted 0x80 PACKSYM 1+N This data token must be immediately followed by a sequence of N packed data bytes. This token is defined by the 3 MSB’s being set to 3’b100. The 5 LSB’s are the number of packed bytes being sent. Note: N cannot be less than 2 since the minimum control packet has a header that is 2 bytes and N cannot be greater than 30 since the maximum data packet has 30 bytes (2 byte header + 7 data objects each having 4 bytes) Packed data bytes have two 4 bit data fields. The 4 LSB’s are sent first, after 4b5b conversion etc in the chip 0xFF JAM_CRC 1 Causes the CRC, calculated by the hardware, to be inserted into the transmit stream when this token reaches the end of the TX FIFO 0x14 EOP 1 Causes an EOP symbol to be sent when this token reaches the end of the TX FIFO 0xFE TXOFF 1 Turn off the transmit driver. Typically the next symbol after EOP RECEIVE DATA TOKENS Receive data tokens provide in-sequence receive control and data for the receive logic. The RxFIFO can absorb as many packets as the number of bytes in the RxFIFO (80 bytes). The tokens are defined as follows: Table 42. TOKENS USED IN RxFIFO Code Name Size (Bytes) Description 111b_bbbb SOP 1 First byte of a received packet to indicate that the packet is an SOP packet (“b” is undefined and can be any bit) 110b_bbbb SOP1 1 First byte of a received packet to indicate that the packet is an SOP’ packet and occurs only if ENSOP1=1 (“b” is undefined and can be any bit) 101b_bbbb SOP2 1 First byte of a received packet to indicate that the packet is an SOP” packet and occurs only if ENSOP2=1 (“b” is undefined and can be any bit) 100b_bbbb SOP1DB 1 First byte of a received packet to indicate that the packet is an SOP’_DEBUG packet and occurs only if ENSOP1DB=1 (“b” is undefined and can be any bit) 011b_bbbb SOP2DB 1 First byte of a received packet to indicate that the packet is an SOP”_DEBUG packet and occurs only if ENSOP2DB=1 (“b” is undefined and can be any bit) 010b_bbbb/ 001b_bbbb/ 000b_bbbb Do Not Use 1 These can be used in future versions of this device and should not be relied on to be any special value. (“b” is undefined and can be any bit) |
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