ppc405ex Applied Micro Circuits Corporation (AMCC), ppc405ex Datasheet - Page 62

• Manufacturer Part Number: ppc405ex
• Description: Powerpc 405ex Embedded Processor
• Manufacturer: Applied Micro Circuits Corporation (AMCC)

PPC405EX – PowerPC 405EX Embedded Processor
Table 21. DDR SDRAM Output Driver Specifications
DDR SDRAM Write Operation
The rising edge of MemClkOut aligns with the first rising edge of the DQS signal on writes as indicated in Figure 9.
DQS rising and falling edges are centered on valid data for writes.
The data in Table 22 is generated by means of simulation and includes logic, driver, package RLC, and lengths.
Values are calculated over best case and worst case processes with speed, junction temperature, and voltage as
follows:
Table 22. DDR SDRAM Write Operation Conditions
Note: In the following tables and timing diagrams, minimum values are measured under best case conditions and
maximum values are measured under worst case conditions. The timing numbers in the following sections are
obtained using a simulation that assumes a model as shown in Figure 8.
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Write Data
MemData00:31
ECC0:7
DM0:4
MemClkOut0
MemAddr00:14
BA0:2
RAS
CAS
WE
BankSel0:1
MemClkEn
DQS0:4
MemODT0:1
Worst
Case
Best
Signal Path
Process Speed
Slow
Fast
I/O H (maximum)
10
10
10
10
10
10
10
10
10
10
10
10
10
Junction Temperature (°C)
Output Current (mA)
+125
−40
Preliminary Data Sheet
Revision 1.21 - July 9, 2008
I/O L (maximum)
10
10
10
10
10
10
10
10
10
10
10
10
10
Voltage (V)
+1.3
+1.1
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