405EX Datasheet, PDF (59/67 Pages) Applied Micro Circuits Corporation – PowerPC 405EX Embedded Processor

PPC405EX – PowerPC 405EX Embedded Processor
Revision 1.09 - August 21, 2007
Preliminary Data Sheet
Table 19. DDR SDRAM Output Driver Specifications
Signal Path
Write Data
MemData00:31
ECC0:7
DM0:4
MemClkOut
MemAddr00:14
BA0:2
RAS
CAS
WE
BankSel0:1
MemClkEn
DQS0:4
MemODT0:1
I/O H (maximum)
10
10
10
10
10
10
10
10
10
10
10
10
10
Output Current (mA)
I/O L (maximum)
10
10
10
10
10
10
10
10
10
10
10
10
10
DDR SDRAM Write Operation
The rising edge of MemClkOut aligns with the first rising edge of the DQS signal on writes. The following data 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 20. DDR SDRAM Write Operation Conditions
Case
Best
Worst
Process Speed
Fast
Slow
Junction Temperature (°C)
−40
+125
Voltage (V)
+1.3
+1.1
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 6.
AMCC Proprietary
59