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參數(shù)資料
| 型號(hào)： | PPC440EP-3pbfffCx |
| 廠商： | Applied Micro Circuits Corp. |
| 英文描述： | Power PC 440EP Embedded Processor |
| 中文描述： | 440EP的Power PC嵌入式處理器 |
| 文件頁數(shù)： | 75/84頁 |
| 文件大?。?/td> | 541K |
| 代理商： | PPC440EP-3PBFFFCX |
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AMCC Proprietary
75
440EP – PPC440EP Embedded Processor
Data Sheet
Revision 1.26 – April 25, 2007
DDR SDRAM Read Operation
The following examples of timing for DDR SDRAM read operations are based on the relationship between the
incoming data and the PLB clock signal. Since the PLB clock cannot be directly observed, the delay of
MemClkOut(0) relative to the PLB clock (T
MD
) is provided.
The internal Read Clock signal, like MemClkOut0, is derived from the PLB clock and can be delayed relative to the
PLB clock by programming the RDCT and RDCD fields in the SDRAM0_TR1 register. The delay can be
programmed from 0 to 1/2 cycle in steps using RDCT. Setting RDCD results in a 1/2 cycle delay plus the value set
in RDCT. The delay of Read Clock relative to the PLB clock (T
RD
) shown below assumes the programmable Read
Clock delay is set to zero.
Figure 9. DDR SDRAM MemClkOut0 and Read Clock Delay
In operation, following the receipt of an address and read command from the PPC440EP, the SDRAM generates
data and the DQS signals coincident with MemClkOut0. The data is latched into the PPC440EP using a DQS
signal that is delayed 1/4 of a cycle. In order to accommodate timing variations introduced by the system designs
using this chip, the three-stage data path shown below is used to eliminate metastability and allow data sampling to
be adjusted for minimum latency. This adjustment requires programming the Read Clock delay and the selection of
Stage 1, Stage 2, or Stage 3 data for sampling at RDSP.
Read Clock
PLB Clk
MemClkOut0(0)
T
MD
T
RD
T
MD
min = 600ps
T
MD
max = 1100ps
T
RD
min = 300ps
T
RD
max = 740ps
min values assume best case conditions.
max values assume worst case conditions.
Note:
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| PPC440GP-3CC400C | Power PC 440GP Embedded Processor |
| PPC440GP-3CC400CZ | Power PC 440GP Embedded Processor |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PPC440EP-5JC333 | 制造商:AppliedMicro 功能描述: |
| PPC440EPX-NPAFFFTS | 制造商:AMCC 制造商全稱:Applied Micro Circuits Corporation 功能描述:PowerPC 440EPx Embedded Processor |
| PPC440EPX-NTA400E | 制造商:AMCC 功能描述:32 BIT POWERPC CORE, UP TO 667 MHZ, 2 10/100/1000 ETHERNET, - Trays |
| PPC440EPX-NTA400EZ | 制造商:AMCC 功能描述:32 BIT POWERPC CORE, UP TO 667 MHZ, 2 10/100/1000 ETHERNET, - Tape and Reel |
| PPC440EPX-NTA533E | 制造商:AMCC 功能描述:32 BIT POWERPC CORE, UP TO 667 MHZ, 2 10/100/1000 ETHERNET, - Trays |
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