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MAS3691CC Datasheet(PDF) 4 Page - Dynex Semiconductor |
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MAS3691CC Datasheet(HTML) 4 Page - Dynex Semiconductor |
4 / 41 page MA3690/1/3 4/41 OPERATION IN BUS CONTROL MODE For this mode of operation the RT/BC pin must be held in the logic zero state. On power up the PUC or RESET line must be pulsed low for a minimum of 500ns causing the chip set to initialise and assume the halted state with the HALTED output low. To release the terminal from the halted state, the subsystem must drive the HALTREQ line through a low to high transition, at which time the HALTED line will go inactive. When the HALTED line goes inactive,the terminal will address a four word deep Instruction Store as shown below, using the C0 and Cl outputs. This first instruction after a Reset is a NOOP. INSTRUCTION STORE C1 C0 Word 0 0 Instruction 0 1 Receive Command 1 0 Transmit Command 1 1 Data Pointer The instruction word specifies the operation which the terminal is to carry out, and is formatted in the following way: Instruction Word Bit 15.14. 13.12.11. 10.9.8.7. 6.5. 4.3. 2.1.0. Retry Retry Interrupt Bus Functlon Message Count Condition Conditlon Select Code Code The significance of the instruction word bits are as follows: Message Code Code Transfer Type 000 RT to BC 001 BC to RT 010 RT to RT, data to BC subsystem 011 RT to RT, no data to BC subsystem 100 Broadcast RT to BC, non data mode commands only 101 Broadcast BC to RT 110 Broadcast RT to RT, data to BC subsystem 111 Broadcast RT to RT, no data to BC subsystem Mode Codes without data are followed by a NOOP. Function Code Code Terminal Function 00 Execute message code 01 Perform self test 10 Monitor bus 11 No operation (NOOP) The Function Code (bits 4 and 3 of the Instruction Word) specifies the required terminal mode of operation. Execute - Code 00 With the Function code bits set to 00, the terminal will execute the message as defined in the Message code bits Self Test - Code 01 If the terminal has been selected to perform a Self Test then the terminal transmitter output stages will be disabled and the self test sequence entered. At the end of the Self Test the transmitter stages will be re-enabled and a Report sequence will be activated, in order to report on the success, or failure, of the Self Test. Passive Monitor - Code 10 If the Function code of the Instruction word is 10 the terminal will disable the transmitter output stages, suspend table execution and merely monitor the specified bus for valid words. No Operation - Code 11 The No Operation code provides a means of introducing delay or a wait sequence into the table operation. In selecting this code the terminal will be forced into the Report sequence and provide either an increment signal (INCADRN) or an interrupt (IRQN) if the Interrupt Always flag in the Instruction word has been selected. Bus Select Code Definition 00 Transmit on bus 0 01 Transmit on bus 1 Note: Bit 6 of the instruction word is tied low internally. The required data bus on which transactions take place is defined by bit 5. In addition to this, this bit defines the bus on which the Transmitter Self Test operation will be conducted and the choice of the bus for monitor purposes in Passive Monitor mode. Interrupt Condition Code Definition 0001 Interrupt if no response 0010 Interrupt if status bit set 0100 Interrupt always 1000 Interrupt if word error If the terminal detects one of the above conditions and the appropriate flag is set, the the IRQ line will pulse low for 250ns. |
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