PPC440SPE-RNB667C datasheet(75/80 Pages) AMCC

75 / 80 page

PowerPC 440SPe Embedded Processor

Revision 1.23 - Sept 21, 2006

AMCC Proprietary

Preliminary Data Sheet

In the following examples, the data strobes (DQS) and the data are shown to be coincident. There is actually a

slight skew as specified by the SDRAM specifications, and there can be additional skew due to loading and signal

routing. It is recommended that the signal length for all of the eight DQS signals be matched.

Figure 10. DDR SDRAM Memory Data and DQS

Table 20. DDR SDRAM I/O Read Timing—TSD and THD

Notes:

1. TSD and THD are measured under worst case conditions.

2. Clock speed for the values in the table is 333.33MHz.

3. The time values in the table include 1/4 of a cycle at 166MHz (3ns x 0.25 = 0.75 ns).

4. To obtain adjusted TSD and THD values for lower clock frequencies, subtract 0.75 ns from the values in the table and add 1/4

of the cycle time for the lower clock frequency (e.g., TSD - 0.75 + 0.25TCYC).

Signal Names

Reference Signal

Read Data vs DQS Set up

TSD (ns)

Read Data vs DQS Hold

THD (ns)

MemData00:07

DQS0

0.00

1.00

MemData08:15

DQS1

0.00

1.00

MemData16:23

DQS2

0.00

1.00

MemData24:31

DQS3

0.00

1.00

MemData32:39

DQS4

0.00

1.00

MemData40:47

DQS5

0.00

1.00

MemData48:55

DQS6

0.00

1.00

MemData56:63

DQS7

0.00

1.00

ECC0:7

DQS8

0.00

1.00

DQS

MemData

TSD

THD

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