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IDT49C465APQF Datasheet

  • IDT49C465APQF

  • 32-BIT FLOW-THRU ERROR DETECTION AND CORRECTION UNIT

  • 38頁

  • IDT

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32-BIT FLOW-THRU
ERROR DETECTION
AND CORRECTION UNIT
Integrated Device Technology, Inc.
IDT49C465
IDT49C465A
FEATURES
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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 鈥?12ns
Error Correction Time 鈥?14ns
On chip diagnostic registers.
Parity generation and checking on system data bus
Low power CMOS 鈥?100mA typical at 20MH
Z
144-pin PGA and PQFP packages
Military product compliant to MIL-STD 883, Class B
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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 Flow-
thruEDC 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 also provides parity protection for
data on the system side.
SIMPLIFIED FUNCTIONAL BLOCK DIAGRAM
MD
0鈥?1
Correct
Logic
Memory
Checkbit
Generator
MD
Latch
MLE
Checkbit
Latch
Syndrome
Generator
Expansion
Logic
ERR
Detect
Logic
MERR
CBI
0鈥?
Mux
PCBI
0鈥?
SD
0鈥?1
Pipeline
Latch
CONTROL
CONTROL
Byte
Mux
System
Checkbit
Generator
SD
Latch
SLE
PLE
Mux
CBO
0鈥?
2552 drw 01
CONTROL
CONTROL
The IDT logo is a registered trademark and Flow-thruEDC is a trademarkof Integrated Device Technology Inc.
MILITARY AND COMMERCIAL TEMPERATURE RANGES
漏1995
Integrated Device Technology, Inc.
AUGUST 1995
DSC-9028/7
11.7
1

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