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SMKR-29C516E-31SB Datasheet(PDF) 9 Page - ATMEL Corporation |
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SMKR-29C516E-31SB Datasheet(HTML) 9 Page - ATMEL Corporation |
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9 / 16 page  29C516E 9 Rev. D (09 Dec. 97) Table 7: Single Bit Error MD [..] [15] [14] [13] [12] [11] [10] [9] [8] [7] [6] [5] [4] [3] [2] [1] [0] SY(hexa) 34h 2Ah 29h 25h 32h 1Ah 16h 13h 31h 23h 15h 0Bh 2Ch 1Ch 0Eh 0Dh MC [..] [–] [–] [5] [4] [3] [2] [1] [0] SY(hexa) ––h ––h 20h 10h 08h 04h 02h 01h 8.3. Double–Bit Error If two errors occur, there will be 2, 3, 4, 5, 6 or 8 bits set to one in the syndrome byte. The syndrome value generated by a double–bit error does not take place of a syndrome value generated by a single–bit error. Then, only the non correctable error flag NCERR will be activated to indicate that errors are present but cannot be corrected. Example: If MD[5] and MC[7] are incorrect, syndrome bits [0], [2], [4] and [6] are set to one (SY=55h ), NCERR is set low and CERR remains at high level. 8.4. Triple–Bit Error When three errors are detected, an error flag is set low as warning to the system. But the generated syndrome can have the listed value of single–bit error. The device must be in detect mode to prevent false correction occurrence. Example: If MD[0], MD[9] and MC[0] are corrupted, the syndrome value is ”1Ah ”. This is decoded by the 29C516E EDAC as being a correctable error on MD[10]. The CERR flag is set low and correction would take place if the device is in correct mode. This would cause more errors. 8.5. 4–bit Wide Memory Error The 8 check–bit code can be used to provide error detection for up to 4 errors occur in the following groups: MD[15..12], MD[11..8], MD[7..4], MD[3..0], MC[7..4] and MC[3..0]. The 29C516E EDAC can flag any number of errors in 4–bit wide memory chip. A special attention must be taken, multi–bit error ( 3) located into the defined groups can provide the syndrome byte of a single–bit error. Example: If MD[11], MD[10], MD[9] and MD[8] are in error, the syndrome code is ”AD h ”. 8.6. 8–bit Wide Memory Error The 8 check–bit code can be used to provide error detection for up to 8 errors occurring in the following groups: MD[15..8], MD[7..0] and MC[7..0]. The 29C516E EDAC can flag any number of errors in 8–bit wide memory chip. A special attention must be taken, multi–bit error ( 3) located into the defined groups can provide the syndrome byte of a single–bit error. Example: If MD[13], MD[12], MD[10] and MD[9] are in error, the syndrome code is ”40h ”. (In 6 check–bit coding, the syndrome code should have been ”00h ”, the ”No Error Detected” value.) Note that the syndrome code ”40 h ” is also the code for MC[6] in error. 9. Transactions Transactions Three types of transactions may be done: 9.1. Memory Read The TRANS pin is driven at a high level to select the access to the memory. The external arbiter drives the U2/U1 pin and dispatches the commands RD/WRx, MEMx and ENx. All transaction managed by the master user can be listened by the second user. |
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