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MAR3690CC Datasheet(PDF) 6 Page - Dynex Semiconductor |
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MAR3690CC Datasheet(HTML) 6 Page - Dynex Semiconductor |
6 / 41 page MA3690/1/3 6/41 REPORT STORE The report store holds information concerning the success or failure of the execution of the last instruction, and is addressed by means of the CODENN, C0 and C1 lines as for the instruction store The report store is addressed when the R/ WN line is low, the instruction store when the R/WN line is high. The report store comprises a Report word, a receive status word (if applicable) and a transmit status word (if applicable). The fourth location has no meaning and is not at anytime addressed. C1 C0 Word 0 0 Report word 0 1 RX status word 1 0 TX status word 1 1 Not used REPORT WORD The report word gives the subsystem information as to the type of error associated with the last transfer (the word will be clear if no error occurred). The report word is formatted as follows: The Report word is written at the end of message execution, after all retries have been exhausted and prior to the IRQN line being set active This word indicates the health of the terminal as well as information relating to the message execution. Transmitter Timeout Error This bit will be set if a transmitter timeout error occurs while the terminal is transmittting or if a self test on the transmitter timeout mechanism fails. This will come into effect 800us after the commencement of the Self Test. The setting of this bit will also cause a subsystem interrupt to be generated. This bit will be reset to logic zero if the terminal is reset. Subsystem Handshake Failure This bit will be set if the subsystem fails to acknowledge a terminal request to transfer a data word in 0.75us for a received data word or 13.5us for a transmit data word. If this condition takes place while the terminal is transmitting the transmission will be aborted. The setting of this bit will also cause a subsystem interrupt to be generated.. This bit will be reset to logic zero if the terminal is reset. Loop Test Failure This bit will be set if the receiver circuitry detects an absence of terminal transmission or a waveform encoding error occurs while the terminal is transmitting. The seting of this bit while the terminal is transmitting will cause the transmission to be aborted and a subsystem interrupt to be generated. This bit will be reset to logic zero if the terminal is reset. Programmed Halt This bit will be set if the Interrupt Always flag of the Instruction word has been selected. This bit will be reset at the start of each new instruction execution cycle. Retry Used This bit will be set if one or more message retries has been attempted. This bit will be reset at the start of each new instruction execution cycle. Word Count Low This bit will be set if the terminal detects fewer valid data words than specified by the Transmit Command word of the Instruction set. This bit will be set low at the start of each instruction execution cycle or message retry. Word County High This bit will be set if the terminal detects more valid data words than specified by the Transmit Command word of the Instruction set. This bit will be set low at the start of each instruction execution cycle or message retry. Command Error This bit will be set if an error occurs in the Instruction set. The setting of this bit will cause instruction execution to be aborted and a subsystem interrupt to be generated. This bit will be reset at the start of each new instruction execution cycle. 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Continuous Bus Traffic 0 TX Timeout Bus 1 TX Timeout Bus 0 RX Status Flag RX Status Missing TX Status Flag TX Status Missing Command Error Word Count High Word Count Low Retry Used Programmed Halt Loop Test Fail SS Handshake Fail TX Timeout Error |
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