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CS8900A bảng dữ liệu(PDF) 102 Page - Cirrus Logic |
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CS8900A bảng dữ liệu(HTML) 102 Page - Cirrus Logic |
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102 / 128 page ![]() 102 DS271PP3 CS8900A Crystal LAN™ ISA Ethernet Controller CIRRUS LOGIC PRODUCT DATA SHEET mode). If the transmit length is erroneous, the command is discarded and the TxBidErr, bit 7, in BusST register is set. 3) The host reads the BusST register. This read is performed in memory mode by reading Regis- ter 18, at memory base + 0138h. In I/O mode, the host must first set the PacketPage Pointer at CS8900A Commits Buffer Space to Transmit Frame Host Reads the BusST Register (Register 18) Transmit Request Host Writes Transmit Frame to CS8900A Host Writes Transmit Command to the TxCMD Register Host Writes Transmit Frame Length to the TxLength Register Exit Transmit Process Yes No Enter Packet Transmit Process Rdy4 TxNOW bit = 1? Polling Loop No Yes Is TxCMD pending? Exit: can’t Issue command Note: Issuing a command at this point will cause previous transmit frame to be lost. CS8900A Transmits Frame Figure 30. Transmit Operation in Polling Mode |
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