Datenblatt-Suchmaschine für elektronische Bauteile |
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74AC899QCX Datenblatt(PDF) 2 Page - National Semiconductor (TI) |
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74AC899QCX Datenblatt(HTML) 2 Page - National Semiconductor (TI) |
2 / 14 page Pin Names Description A0–A7 A Bus Data InputsData Outputs B0–B7 B Bus Data InputsData Outputs APAR BPAR A and B Bus Parity Inputs ODDEVEN ODDEVEN Parity Select Active LOW for EVEN Parity GBA GAB Output Enables for A or B Bus Active LOW SEL Select Pin for Feed-Through or Generate Mode LOW for Generate Mode LEA LEB Latch Enables for A and B Latches HIGH for Transparent Mode ERRA ERRB Error Signals for Checking Generated Parity with Parity In LOW if Error Occurs Functional Description The ’AC’ACT899 has three principal modes of operation which are outlined below These modes apply to both the A- to-B and B-to-A directions Bus A (B) communicates to Bus B (A) parity is generat- ed and passed on to the B (A) Bus as BPAR (APAR) If LEB (LEA) is HIGH and the Mode Select (SEL) is LOW the parity generated from B 07 (A 07 ) can be checked and monitored by ERRB (ERRA) Bus A (B) communicates to Bus B (A) in a feed-through mode if SEL is HIGH Parity is still generated and checked as ERRA and ERRB in the feed-through mode (can be used as an interrupt to signal a dataparity bit error to the CPU) Independent Latch Enables (LEA and LEB) allow other permutations of generatingchecking (see Function Ta- ble below) Function Table Inputs Operation GAB GBA SEL LEA LEB H H X X X Busses A and B are TRI-STATE H L L L H Generates parity from B 07 based on OE (Note 1) Generated parity x APAR Generated parity checked against BPAR and output as ERRB H L L H H Generates parity from B 07 based on OE Generated parity x APAR Generated parity checked against BPAR and output as ERRB Generated parity also fed back through the A latch for generatecheck as ERRA H L L X L Generates parity from B latch data based on OE Generated parity x APAR Generated parity checked against latched BPAR and output as ERRB H L H X H BPARB 07 x APARA07 Feed-through mode Generated parity checked against BPAR and output as ERRB H L H H H BPARB 07 x APARA 07 Feed-through mode Generated parity checked against BPAR and output as ERRB Generated parity also fed back through the A latch for generatecheck as ERRA L H L H L Generates parity for A 07 based on OE Generated parity x BPAR Generated parity checked against APAR and output as ERRA L H L H H Generates parity from A 07 based on OE Generated parity x BPAR Generated parity checked against APAR and output as ERRA Generated parity also fed back through the B latch for generatecheck as ERRB L H L L X Generates parity from A latch data based on OE Generated parity x BPAR Generated parity checked against latched APAR and output as ERRA L H H H L APARA 07 x BPARB 07 Feed-through mode Generated parity checked against APAR and output as ERRA L H H H H APARA 07 x BPARB 07 Feed-through mode Generated parity checked against APAR and output as ERRA Generated parity also fed back through the B latch for generatecheck as ERRB H e HIGH Voltage Level L e LOW Voltage Level X e Immaterial Note 1 OE e ODDEVEN 2 |
Ähnliche Teilenummer - 74AC899QCX |
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Ähnliche Beschreibung - 74AC899QCX |
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