mpc8379e Freescale Semiconductor, Inc, mpc8379e Datasheet - Page 19

• Manufacturer Part Number: mpc8379e
• Description: Powerquicc Ii Pro Processor Hardware Specifications
• Manufacturer: Freescale Semiconductor, Inc

Table 20
6.2.2
Table 21
Freescale Semiconductor
Controller skew for MDQS-MDQ/MECC/MDM
Note:
1
2
3
MCK n cycle time, MCK n /MCK n crossing
ADDR/CMD output setup with respect to MCK
ADDR/CMD output hold with respect to MCK
MCS n output setup with respect to MCK
MCS n output hold with respect to MCK
MCK to MDQS skew
t
be captured with MDQS n . This should be subtracted from the total timing budget.
The amount of skew that can be tolerated from MDQS to a corresponding MDQ signal is called t
determined by the following equation: t
absolute value of t
This specification applies only to DDR2 interface.
CISKEW
provides the input AC timing specifications for the DDR1 and DDR2 SDRAM interface.
shows the DDR1 and DDR2 SDRAM output AC timing specifications.
represents the total amount of skew consumed by the controller between MDQS n and any corresponding bit that will
DDR1 and DDR2 SDRAM Output AC Timing Specifications
Parameter
Parameter
CISKEW
Table 21. DDR1 and DDR2 SDRAM Output AC Timing Specifications
MPC8379E PowerQUICC II Pro Processor Hardware Specifications, Rev. 3
Table 20. DDR1 and DDR2 SDRAM Input AC Timing Specifications
.
400 MHz data rate
333 MHz data rate
266 MHz data rate
200 MHz data rate
400 MHz data rate
333 MHz data rate
266 MHz data rate
200 MHz data rate
400 MHz data rate
333 MHz data rate
266 MHz data rate
200 MHz data rate
400 MHz data rate
333 MHz data rate
266 MHz data rate
200 MHz data rate
400 MHz data rate
333 MHz data rate
266 MHz data rate
DISKEW
= ±[T/4 – |t
Symbol
t
t
t
t
t
DDKHMH
DDKHAS
DDKHAX
DDKHCS
DDKHCX
Symbol
t
CISKEW
t
MCK
CISKEW
1
|] where T is the MCK clock period and |t
–500
–750
–750
Min
1.95
2.40
3.15
4.20
1.95
2.40
3.15
4.20
1.95
2.40
3.15
4.20
1.95
2.40
3.15
4.20
–0.6
Min
5
Max
500
750
750
Max
0.6
10
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
DISKEW
DDR1 and DDR2 SDRAM
Unit
. This can be
ps
CISKEW
Unit
ns
ns
ns
ns
ns
ns
| is the
Notes
Notes
1, 2
3, 7
3, 7
4, 8
—
—
3
2
3
3
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