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AM8530 Datasheet(PDF) 5 Page - Advanced Micro Devices |
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AM8530 Datasheet(HTML) 5 Page - Advanced Micro Devices |
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5 / 194 page ![]() Table of Contents AMD 3.9 Block Transfers 3–15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.9.1 Wait on Transmit 3–16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.9.2 Wait on Receive 3–16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.9.3 DMA Requests 3–17 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.9.3.1 DMA Request on Transmit (using W/REQ) 3–17 . . . . . . . . . . . . . . . . . . . . . . 3.9.3.2 DMA Request on Transmit (using DTR/REQ) 3–18 . . . . . . . . . . . . . . . . . . . . 3.9.3.3 DTR/REQ Deactivation Timing 3–19 . . . . . . . . . . 3.9.3.4 DMA Request on Receive (using W/REQ) 3–20 . Chapter 4 Data Communication Modes Functional Description 4.1 Introduction 4–3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.2 Protocols 4–3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.2.1 Asynchronous 4–3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.2.2 Synchronous Transmission 4–4 . . . . . . . . . . . . . . . . . . . . 4.2.2.1 Synchronous Character-Oriented Protocol 4–4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.2.2.2 Synchronous Bit-Oriented 4–4 . . . . . . . . . . . . . . 4.3 Mode Selection 4–5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.4 Receiver Overview 4–6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.4.1 Rx Character Length 4–7 . . . . . . . . . . . . . . . . . . . . . . . . . 4.4.2 Rx Parity 4–8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.4.3 Rx Modem Control 4–9 . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.5 Transmitter Overview 4–9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.5.1 Tx Character Length 4–9 . . . . . . . . . . . . . . . . . . . . . . . . . 4.5.2 Tx Parity 4–11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.5.3 Break Generation 4–11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.5.4 Transmit Modem Control 4–11 . . . . . . . . . . . . . . . . . . . . . . 4.5.5 Auto RTS Reset 4–11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.6 Asynchronous Mode Operation 4–12 . . . . . . . . . . . . . . . . . . . . . . . 4.6.1 Receiver Operation 4–12 . . . . . . . . . . . . . . . . . . . . . . . . . . 4.6.1.1 Receiver Initialization 4–12 . . . . . . . . . . . . . . . . . 4.6.1.2 Framing Error 4–12 . . . . . . . . . . . . . . . . . . . . . . . 4.6.1.3 Break Detection 4–13 . . . . . . . . . . . . . . . . . . . . . . 4.6.1.4 Clock Selection 4–13 . . . . . . . . . . . . . . . . . . . . . . 4.6.2 Transmitter Operation 4–13 . . . . . . . . . . . . . . . . . . . . . . . . 4.6.2.1 Transmitter Initialization 4–13 . . . . . . . . . . . . . . . 4.6.2.2 Stop Bit Selection 4–13 . . . . . . . . . . . . . . . . . . . . 4.7 SDLC Mode Operation 4–14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.7.1 Receiver Operation 4–14 . . . . . . . . . . . . . . . . . . . . . . . . . . 4.7.1.1 Flag Detect Output 4–14 . . . . . . . . . . . . . . . . . . . 4.7.1.2 Receiver Initialization 4–14 . . . . . . . . . . . . . . . . . 4.7.1.3 10x19-Bit Frame Status FIFO 4–14 . . . . . . . . . . . 4.7.1.3.1 FIFO Enabling/Disabling 4–15 . . . . . . . . 4.7.1.3.2 FIFO Read Operation 4–15 . . . . . . . . . . 4.7.1.3.3 FIFO Write Operation 4–15 . . . . . . . . . . 4.7.1.3.4 14-Bit Byte Counter 4–15 . . . . . . . . . . . 4.7.1.3.5 Am85C30 Frame Status FIFO Operation Clarification 4–18 . . . . . 4.7.1.3.6 Am85C30 Aborted Frame Handling When Using the 10x19 Frame Status FIFO 4–19 . . . . . . . . . . . . 4.7.1.4 Address Search Mode 4–19 . . . . . . . . . . . . . . . . . 4.7.1.5 Abort Detection 4–20 . . . . . . . . . . . . . . . . . . . . . . 4.7.1.6 Residue Bits 4–21 . . . . . . . . . . . . . . . . . . . . . . . . 4.7.2 SDLC Mode CRC Polynomial Selection 4–21 . . . . . . . . . . 4.7.2.1 Rx CRC Initialization 4–22 . . . . . . . . . . . . . . . . . . 4.7.2.2 Rx CRC Enabling 4–22 . . . . . . . . . . . . . . . . . . . . |
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