IDT49C465APQFB Ver la hoja de datos (PDF) - Integrated Device Technology
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IDT49C465APQFB Datasheet PDF : 38 Pages
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IDT49C465/A
32-BIT FLOW-THRU ERROR DETECTION AND CORRECTION UNIT
MILITARY AND COMMERCIAL TEMPERATURE RANGES
DETAILED DESCRIPTION — 64-BIT CONFIGURATION (Con’t.)
64-BIT SYNDROME DECODE TO BIT-IN-ERROR(1)
HEX 0 1 2 3 4 5 6 7 8 9 A B C D E F
S7 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1
S6 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1
Syndrome
S5 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1
Bits
S4 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1
HEX S3 S2 S1 S0
00000
* C4 C5 T C6 T T 62 C7 T T 46 T M M T
10001
C0 T T 14 T M M T T M M T M T T 30
20010
C1 T T M T 34 56 T T 50 40 T M T T M
30011
T 18 8 T M T T M M T T M T 2 24 T
40100
C2 T T 15 T 35 57 T T 51 41 T M T T 31
50101
T 19 9 T M T T 63 M T T 47 T 3 25 T
60110
T 20 10 T M T T M M T T M T 4 26 T
70111
M T T M T 36 58 T T 52 42 T M T T M
81000
C3 T T M T 37 59 T T 53 43 T M T T M
91001
T 21 11 T M T T M M T T M T 5 27 T
A1010
T 22 12 T 33 T T M 49 T T M T 6 28 T
B1011
17 T T M T 38 60 T T 54 44 T 1 T T M
C1100
T 23 13 T M T T M M T T M T 7 29 T
D1101
M T T M T 39 61 T T 55 45 T M T T M
E1110
16 T T M T M M T T M M T 0 T T M
F1111
T M M T 32 T T M 48 T T M T M M T
NOTES:
2552 tbl 17
1. The table indicates the decoding of the seven syndrome bits to identify the bit-in-error for a single-bit error, or whether a double or triple-bit error was
detected. The all-zero case indicates no error detected.
* = No errors detected
# = The number of the single bit-in-error
T = Two errors detected
M = Three or more detected
KEY AC CALCULATIONS — 64-BIT CASCADED CONFIGURATION
64-Bit Propagation Delay
Total AC Delay for IDT49C465 in 64-bit Mode
Mode
From
To
(L) = Lower slice
(U) = Upper slice
Generate
Detect
SD Bus
MD Bus
MD Bus
Checkbits out
ERR for 64-bits
MERR for 64-bits
SD to CBO(L) + PCBI to CBO(U)
t SC(L) + t PCC(U)
MD to SYO(L) + CBI to ERR (U)
t MSY(L) + t CE (U)
MD to SYO(L) + CBI to M ERR
t MSY(L) + t CME (U)
Correct
MD Bus
Corrected data out
MD to SYO(L) + CBI to SD(U)
t MSY(L) + t CS (U)
(or) → MD to SYO(U) + PCBI to SD(L)
t MSY(U) + t PCS(L)
NOTE:
1. (or) = Whichever is worse.
2552 tbl 18
11.7
19
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