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MPC8540 Datasheet(PDF) 390 Page - Freescale Semiconductor, Inc

Part # MPC8540
Description  MPC8540 PowerQUICC III??Integrated Host Processor Reference Manual
PDF  1302 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MPC8540 Datasheet(HTML) 390 Page - Freescale Semiconductor, Inc

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MPC8540 PowerQUICC III Integrated Host Processor Reference Manual, Rev. 1
9-36
Freescale Semiconductor
DDR Memory Controller
must be completed and the DDR SDRAM initialized before any accesses to SDRAM are
attempted.
Figure 9-26 through Figure 9-28 show DDR SDRAM timing for various types of accesses; see
Figure 9-26 for a back-to-back burst read operation, Figure 9-27 for a single-beat write operation,
and Figure 9-28 for a burst-write operation. Note that all signal transitions occur on the rising edge
of the memory bus clock and that single-beat read operations are identical to burst-reads.
Figure 9-26. DDR SDRAM Burst Read Timing—ACTTORW = 3, MCAS Latency = 2
ACTTORW
ROW
COL
SDRAM clock
MCS
MCAS
MA[13:0]
MDQ[0:63]
MWE
MRAS
MDQS
COL
D1 D2 D3
D1 D2
D0
D3
D0
01
234
5
6
7
8
910
11
12
CASLAT



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