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HI-3597PSI Datasheet(PDF) 4 Page - Holt Integrated Circuits |
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HI-3597PSI Datasheet(HTML) 4 Page - Holt Integrated Circuits |
4 / 18 page HI-3596, HI-3597, HI-3598, HI-3599 HOLT INTEGRATED CIRCUITS 4 Table 2. DefinedInstructions ARINC Channel OP CODE Hex DATA FIELD Description X 0h None Instruction not implemented. No operation. 1h - 8h 1h 128 bits Loadlabelvaluestolabelmemory.Thedatafieldconsistsof16,8-bitlabels. If fewer than 16 labels are needed for the application, the memory must be padded with redundant (duplicate) label values. 1h - 8h 2h 128 bits Read the contents of the label memory for this channel. 1h - 8h 3h 32 bits Read an ARINC word from the receive FIFO for this channel. If the FIFO is empty all zeros will be read. 1h - 8h 4h 16 bits Loadthespecifiedchannel’sControlRegisterandclearthatchannel’sFIFO. 1h - 8h 5h 16 bits Readthespecifiedchannel’sControlRegister. X 6h 16 bits Read the Status Register. X 7h None Master Reset (All channels). X 8h 32 bits Load the Transmit Register (High-speed data rate). This can also be used as atestwordforeachreceiver(Loopbackself-test). X 9h 32 bits Load the Transmit Register (Low-speed data rate). This can also be used asatestwordforeachreceiver(Loopbackself-test). X Ah - Fh None Instruction not implemented. No operation. INSTRUCTIONS Instruction op codes are used to read, write and con- figure the HI-359x devices.The instruction format is illustrated in Figure 2. When CS goes low, the next 8 clocksattheSCKpinshiftaninstructionopcodeinto thedecoder,startingwiththefirstrisingedge.Theop codeisfedintotheSIpin,mostsignificantbitfirst. Forwriteinstructions,themostsignificantbitofthedata word must immediately follow the instruction op code andisclockedintoitsregisteronthenextrisingSCK edge. Data word length varies depending on word type written: 16-bit Control Register writes, 32-bit transmit register writes or 128-bit writes to a channel’s label- matching enable/disable memory. For read instructions, the most significant bit of the requested data word appears at the SO pin after the last opcodebitisclockedintothedecoder,atthenextfall- ing SCK edge. As in write instructions, the data field bit-length varies with read instruction type. Channel-specificinstructionsusetheupperfourbitsto specify an ARINC 429 receiver channel, 1-8 hex. The lower four bits specify the op code, described in Table 2.Thefourchannelassignmentbitsare“don’tcare”for instructionsthatarenotchannel-specific,suchasMas- ter Reset. Example: One SPI Instruction op code 14 hex data field 0232 hex MSB LSB MSB LSB CS SCK SI SPI INSTRUCTION FORMAT 7 6 5 4 3 2 1 0 MSB LSB ARINC 429 Channel OP Code ie: Load channel 1 control register with 0232 hex Figure 2. SPI Instruction Format |
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