Motorola MVME2400 Series Wartungshandbuch Seite 267

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Software Considerations
http://www.mcg.mot.com/literature 3-81
3
Note
1. Use tRAS from the SDRAM block that has the slowest tRAS.
2. tRAS_CLK is tRAS expressed in CLK periods.
3. Use tRP from the SDRAM block that has the slowest tRP.
4. tRP_CLK is tRP expressed in CLK periods.
5. Use tRCD from the SDRAM block that has the slowest tRCD.
6. tRCD_CLK is tRCD expressed in CLK periods.
7. Use tRC from the SDRAM block that has the slowest tRC.
8. tRC_CLK is tRC expressed in CLK periods.
$FEF800D0
bits 5,6,7
(trc
)
tRC
(SPD Bytes 30
and 27)
tRC_CLK = (tRAS +
tRP)/T
(T = CLK Period
in nanoseconds)
See Notes 7, 8 and 9
0.0 < tRC_CLK <=
6.0
trc
=%110
6.0 < tRC_CLK <=
7.0
trc
=%111
7.0 < tRC_CLK <=
8.0
trc
=%000
8.0 < tRC_CLK <=
9.0
trc
=%001
9.0 < tRC_CLK <=
10.0
trc
=%010
10.0 < tRC_CLK <=
11.0
trc
=%011
11.0 < tRC_CLK illegal
Table 3-18. Deriving tras, trp, trcd and trc Control Bit Values from SPD
Information
Control Bits Parameter Parameter Expressed
in CLK Periods
Possible Control Bit Values
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