Dp8402a/dp8403/dp8404/dp8405 32-bit Parallel Error Detection And Correction Circuits (edacs) - National Semiconductor

The DP8402A DP8403 DP8404 and DP8405 devices are 32-bit parallel error detection and correction circuits (EDACs) in 52-pin DP8402A and DP8403 or 48-pin DP8404 and DP8405 600-mil packages. The EDACs use a modified Hamming code to generate a 7-bit check word from a 32-bit data word. This check word is stored along with the data word during the memory write cycle. During the memory read cycle, the 39-bit words from memory are processed by the EDACs to determine if errors have occurred in memory. Single-bit errors in the 32-bit data word are flagged and cor- rected. Single-bit errors in the 7-bit check word are flagged, and the CPU sends the EDAC through the correction cycle even though the 32-bit data word is not in error. The correction cycle will simply pass along the original 32-bit data word in this case and produce error syndrome bits to pinpoint the error-generating location. By National Semiconductor Corporation
DP8402A 's PackagesDP8402A 's pdf datasheet

DP8402A Pinout, Pinouts
DP8402A pinout,Pin out
This is one package pinout of DP8402A,If you need more pinouts please download DP8402A's pdf datasheet.

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