IDT49C465

32-BIT FLOW-THRU ERROR DETECTION AND CORRECTION UNIT Integrated Device Technology, Inc. IDT49C465 IDT49C465A FEATURES 32-bit wide Flow-thruEDC™ unit, cascadable to 64 bits Single-chip 64-bit Generate Mode Separate system and memory buses On-chip pipeline latch with external control Supports bidirectional and common I/O memories Corrects all single-bit errors Detects all double-bit errors, some multiple-bit errors Error Detection Time — 12ns Error Correction Time — 14ns On chip diagnostic registers. Parity generation and checking on system data bus Low power CMOS — 100mA typical at 20MHZ 144-pin PGA and PQFP packages Military product compliant to MIL-STD 883, Class B DESCRIPTION The IDT49C465/A is a 32-bit, two-data bus, Flow-thruEDC unit. The chip provides single-error correction and two and three bit error detection of both hard and soft memory errors. It can be expanded to 64-bit widths by cascading 2 units, without the need for additional external logic. The FlowthruEDC has been optimized for speed and simplicity of control. The EDC unit has been designed to be used in either of two configurations in an error correcting memory system. The bidirectional configuration is most appropriate for systems using bidirectional memory buses. A second system configuration utilizes external octal buffers, and is well suited for systems using memory with separate I/O buses. The IDT49C465/A supports partial word writes, pipelining and error diagnostics. It...