MOD5272-100IR NetBurner Inc, MOD5272-100IR Datasheet - Page 208
![PROCESSOR MODULE FLASH MOD5272](/photos/6/75/67555/mod5272-100ir_sml.jpg)
MOD5272-100IR
Manufacturer Part Number
MOD5272-100IR
Description
PROCESSOR MODULE FLASH MOD5272
Manufacturer
NetBurner Inc
Type
Controllers & Processorsr
Datasheets
1.MOD5272-100IR.pdf
(2 pages)
2.MOD5272-100IR.pdf
(3 pages)
3.MOD5272-100IR.pdf
(550 pages)
Specifications of MOD5272-100IR
Module/board Type
Processor Module
Ethernet Connection Type
10/100 Ethernet Port RJ-45
Operating Voltage
3.3 V
Product
Modules
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With/related Products
MOD5272
For Use With
528-1001 - KIT DEVELOP NETWORK FOR MOD5272
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
528-1008
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Solving Timing Issues with SDCR[INV]
The incoming data setup time should be inspected during reads. The active clock edge event
of SDCLK now precedes the MCF5272 internal active clock edge event when (REG = 0).
This behavior is frequency dependent. The two following scenarios are possible:
If the delay between shifted SDCLK and following internal system clock edge is shorter
than the read access time of the SDRAM, data is sampled with the true CAS latency.
Selecting a system clock frequency low enough that the SDCLK-to-CLK delay is long
compared to the SDRAM read access time reduces effective CAS latency by 1 cycle.
9-14
Internal CLK
Internal
• High-speed timing refinement with true CAS latency. See Figure 9-7.
• Low-speed timing refinement with reduced effective CAS latency.
Figure 9-7. Timing Refinement with True CAS Latency and Inverted SDCLK
SDCLK
SDCLK
Data
Data
CLK
Figure 9-8. Timing Refinement with Effective CAS Latency
T
SDCLK_to_CLK
Shifted delay of SDCLK
MCF5272 User’s Manual
- T
CASL = 1
acc
> 0 => effective CAS latency reduced by 1
CASL = 2
T
SDCLK_to_CLK
Shifted delay of SDCLK
- T
acc
< 0 => true CAS latency
Delay SDCLK to CLK
SDRAM read access time
SDRAM read access time
Delay SDCLK to CLK
MOTOROLA
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