CIRCUIT CODER TRI STATE PDF
CIRCUIT CODER TRI STATE CODE

CIRCUIT CODER TRI STATE CODE

H03M- CODING DECODING CODE CONVERSION IN GENERAL.Assignors: ABDELHAMID, BOULENOUAR, OISEL, ANDRE, LE GLEAU, DENISE Application granted granted Critical Publication of US4566105A publication Critical patent/US4566105A/en Anticipated expiration legal-status Critical Status Expired - Fee Related legal-status Critical Current Links Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Priority claimed from FR8215403 external-priority Application filed by Bull SA filed Critical Bull SA Assigned to CII HONEYWELL BULL (SOCIETE ANONYME) reassignment CII HONEYWELL BULL (SOCIETE ANONYME) ASSIGNMENT OF ASSIGNORS INTEREST. Original Assignee Bull SA Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Fee Related Application number US06/531,680 Inventor Andre Oisel Abdelhamid Boulenouar Denise Le Gleau Current Assignee (The listed assignees may be inaccurate.

CIRCUIT CODER TRI STATE PDF

Google Patents Coding, detecting or correcting transmission error systemĭownload PDF Info Publication number US4566105A US4566105A US06/531,680 US53168083A US4566105A US 4566105 A US4566105 A US 4566105A US 53168083 A US53168083 A US 53168083A US 4566105 A US4566105 A US 4566105A Authority US United States Prior art keywords register error errors message bits Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents US4566105A - Coding, detecting or correcting transmission error system If the EN pin has a logic high applied to it, then all buffers will be tri-stated ('ZZZZ' is used to tri-state all four buffers in the VHDL code).US4566105A - Coding, detecting or correcting transmission error system When the enable pin EN4 is low, then each of the logic states on the inputs of the buffers will appear on their corresponding outputs. The quad input tri-state buffer with single enable is created with the following VHDL code: If a logic 1 is on the EN pin, the output Y will be tri-stated (made high impedance indicated by Z in VHDL). When the EN pin is low, then the logic level on the A input will appear on the Y output. The single tri-state buffer is created in VHDL using the following line of code: OUT4 <= IN4 when (EN4 = '0') else 'ZZZZ' 4 input/output active low enabled tri-state buffer single active low enabled tri-state buffer OUT4 : out STD_LOGIC_VECTOR (3 downto 0)) Īrchitecture Behavioral of tri_state_buffer_top is 4 input / output buffer with one enable Port ( A : in STD_LOGIC - single buffer inputĮN : in STD_LOGIC - single buffer enable The VHDL code for the single and quad tri-state buffers is shown below. Tri-state Buffer Symbol – Active Low Enable Four Tri-state Buffers with Single Active Low Enable Tri-state Buffer VHDL Code Both of these buffers are written in VHDL and implemented on a CPLD.

A group of four tri-state buffers with a single enable pin is also shown. A single tri-state buffer with active low enable pin is shown below.

Circuit coder tri state