MSC8144AMC-SA Freescale Semiconductor, MSC8144AMC-SA Datasheet - Page 39

• Manufacturer Part Number: MSC8144AMC-SA
• Description: BOARD AMC SGL WIDTH MSC8144 DSP
• Manufacturer: Freescale Semiconductor
• Type: DSPr

Specifications of MSC8144AMC-SA

• Contents: Board
• For Use With/related Products: MSC8144
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

2.6.4
This section describes the AC electrical characteristics for the DDR SDRAM interface.
2.6.4.1
Table 20
Table 21
Table 22
Freescale Semiconductor
AC input low voltage
AC input high voltage
Note:
AC input low voltage
AC input high voltage
Note:
Controller Skew for MDQS—MDQ/MECC/MDM
• 400 MHz
• 333 MHz
• 266 MHz
• 200 MHz
Notes:
provides the input AC timing specifications for the DDR SDRAM when
provides the input AC timing specifications for the DDR SDRAM when
provides the input AC timing specifications for the DDR SDRAM interface.
At recommended operating conditions with V
At recommended operating conditions with V
1.
2.
DDR SDRAM AC Timing Specifications
t
captured with MDQS[n]. Subtract this value from the total timing budget.
At recommended operating conditions with V
CISKEW
DDR SDRAM Input Timings
Table 21. DDR2 SDRAM Input AC Timing Specifications for 1.8-V Interface
Table 20. DDR SDRAM Input AC Timing Specifications for 2.5-V Interface
represents the total amount of skew consumed by the controller between MDQS[n] and any corresponding bit that is
MSC8144 Quad Core Digital Signal Processor Data Sheet, Rev. 16
Parameter
Parameter
Table 22. DDR SDRAM Input AC Timing Specifications
Parameter
1
DDDDR
DDDDR
DDDDR
of 2.5 ± 5%.
of 1.8 ± 5%.
(1.8 V or 2.5 V) ± 5%
Symbol
Symbol
V
V
V
V
IH
IH
IL
IL
Symbol
t
CISKEW
V
V
DDDDR
DDDDR
MV
MV
REF
REF
Min
Min
—
—
+ 0.31
+ 0.25
(typ) = 2.5 V.
(typ) = 1.8 V.
–365
–390
–428
–490
Min
Electrical Characteristics
MV
MV
REF
REF
Max
Max
—
—
Max
365
390
428
490
– 0.31
– 0.25
Unit
Unit
Unit
ps
ps
ps
ps
V
V
V
V
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