MPC8360E/MPC8358E PowerQUICC II Pro Processor Revision 2.x TBGA Silicon Hardware Specifications, Rev. 4
Freescale Semiconductor
23
DDR and DDR2 SDRAM
Figure 6
shows the input timing diagram for the DDR controller.
Figure 6. DDR Input Timing Diagram
6.2.2
DDR and DDR2 SDRAM Output AC Timing Specifications
Table 21
and
Table 22
provide the output AC timing specifications and measurement conditions for the
DDR and DDR2 SDRAM interface.
Table 20. DDR and DDR2 SDRAM Input AC Timing Specifications Mode
At recommended operating conditions with GV
DD
of (1.8 or 2.5 V) ± 5%.
Parameter
Symbol
Min
Max
Unit
Notes
MDQS—MDQ/MECC input skew per byte
333 MHz
266 MHz
200 MHz
t
DISKEW
–750
–1125
–1250
750
1125
1250
ps
1, 2
Notes:
1. AC timing values are based on the DDR data rate, which is twice the DDR memory bus frequency.
2. Maximum possible skew between a data strobe (MDQS[n]) and any corresponding bit of data (MDQ[8n + {0...7}] if 0
≤
n
≤
7)
or ECC (MECC[{0...7}] if n = 8).
Table 21. DDR and DDR2 SDRAM Output AC Timing Specifications for Source
Synchronous Mode
At recommended operating conditions with GV
DD
of (1.8 V or 2.5 V) ± 5%.
Parameter
8
Symbol
1
Min
Max
Unit
Notes
MCK[n] cycle time, (MCK[n]/MCK[n] crossing)
t
MCK
6
10
ns
2
Skew between any MCK to ADDR/CMD
333 MHz
266 MHz
200 MHz
t
AOSKEW
–1.0
–1.1
–1.2
0.2
0.3
0.4
ns
3
MCK[n]
MCK[n]
t
MCK
MDQ[x]
MDQS[n]
t
DISKEW
D1
D0
t
DISKEW