Title: Logical circuit having bypass circuit

Abstract: The logical circuit includes therein a logic block for performing a logical function. The logic block is connected with the selection circuit and the selection circuit selects the input signals thereto in response to the selection signal. The input terminals of the logic block are connected with a bypass circuit and the bypass circuit transmits the input signals applied to the input terminals of the logic block to the selection circuit. When the selection signal takes the selected one of the values, the input signals to the logic block are bypassed through the bypass circuit, without being passed through the logic circuit, and delivered as the outputs of the selection circuit.

Do you think this is a good invention? Vote now:

Votes so far: For:(0) Against:(0)
Other info:

Inventors: Oka, Yuichi (Hadano, JP)
Takiguchi, Yosimitsu (Hadano, JP)

Application Number: 06/022949
Filing Date: 1979-03-22
Publication_date: 1981-08-25
Assignee: HITACHI LTD

Primary Class(es): 326/16 326/39
Other Classes: G01R31/3185; H03K19/173; G01R31/28; H03K17/00; H03K19/00; H03K13/32
US Patent Ref:

3800233	March, 1974	Sauthier	307/218	ADJUSTABLE FREQUENCY PULSE GENERATOR
3924144	December, 1975	Hadamard	324/73R	Method for testing logic chips and logic chips adapted therefor
4055754	September, 1977	Chesley	324/73R	Memory device and method of testing the same
4176258	November, 1979	Jackson	324/73R	Method and circuit for checking integrated circuit chips

Other Refs:
Primary Examiner: Zazworsky, John
Assistant Examiner:
Attorney: Craig, And Antonelli

Claims:

We cla