Control Logic Gates




The block diagram of the control logic gates is shown in Fig. 5-6. The inputs to this circuit come from the two decoders, the I flip-flop, and bits 0 through 11 of IR.

Topics You May Be Interested InControl Logic Gates
Data Types Binary Lncrementer
Alphanumeric Representation Instruction Codes
Floating-point Representation Instruction Codes
Register Transfer -2 Add To Ac
Bus And Memory Transfers -2 Sta: Store Ac & Bun: Branch Unconditionally

The other inputs to the control logic are: AC bits 0 through 15 to check if AC = 0 and to detect the sign bit in AC(15); DR bits 0 through 15 to check if DR = 0; and the values of the seven flip-flops. The outputs of the control logic circuit are:

Topics You May Be Interested InControl Logic Gates
Subtraction Of Unsigned Numbers Other Alphanumeric Codes
Flow Control Register Transfer
Decimal Fixed-point Representation Timing And Control
Floating-point Representation Timing And Control -2
Other Binary Code And To Ac

1. Signals to control the inputs of the nine registers

Topics You May Be Interested InControl Logic Gates
Number System Binary Lncrementer
Subtraction Of Unsigned Numbers-2 Operation Code
Flow Control Fetch And Decode
Other Alphanumeric Codes Add To Ac
Three-state Bus Buffers Lda: Load To Ac

2. Signals to control the read and write inputs of memory

Topics You May Be Interested InControl Logic Gates
Octal And Hexadecimal Number Conversion -2 Binary Adder-subtractor
Complements -2 Common Bus System
Fixed-point Representation Timing And Control
Floating-point Representation Fetch And Decode
Binary Adder Lda: Load To Ac

3, Signals to set, clear, or complement the flip-flops

Topics You May Be Interested InControl Logic Gates
Subtraction Of Unsigned Numbers-2 Some Applications Hardware Implemntation
Integer Representation Common Bus System-memory Address
Other Binary Code Register-reference Instructions
Other Decimal Codes Memory-reference Instructions
Other Alphanumeric Codes Add To Ac

4. Signals for 52, 51, and 50 to select a register for the bus

5. Signals to control the AC adder and logic circuit

The specifications for the various control signals can be obtained directly from the list of register transfer statements.



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