M5275EVBE Freescale Semiconductor, M5275EVBE Datasheet - Page 30

• Manufacturer Part Number: M5275EVBE
• Description: MCF5274/75 EVALUATION BO
• Manufacturer: Freescale Semiconductor
• Series: ColdFire®r
• Type: Microprocessorr

Specifications of M5275EVBE

• Contents: Module and Misc Hardware
• Silicon Manufacturer: Freescale
• Core Architecture: Coldfire
• Core Sub-architecture: Coldfire V2
• Silicon Core Number: MCF52
• Silicon Family Name: MCF527x
• Rohs Compliant: Yes
• For Use With/related Products: MCF5274, MCF5275
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Electrical Characteristics
Figure 13
30
1
2
3
4
5
6
7
DD13 DQS input read preamble width (t
DD14 DQS input read postamble width (t
DD15 DQS output write preamble width (t
DD16 DQS output write postamble width (t
NUM
All timing specifications are based on taking into account, a 25pF load on the SDRAM output pins.
DDR_CLKOUT operates at half the frequency of the PLLMRFM output and the ColdFire core.
t
D[31:24] is relative to SD_DQS3 and D[23:16] is relative to SD_DQS2.
The first data beat is valid before the first rising edge of SD_DQS and after the SD_DQS write preamble. The remaining
data beats are valid for each subsequent SD_DQS edge
Data input skew is derived from each SD_DQS clock edge. It begins with a SD_DQS transition and ends when the last data
line becomes valid. This input skew must include DDR memory output skew and system level board skew (due to routing or
other factors).
Data input hold is derived from each SD_DQS clock edge. It begins with a SD_DQS transition and ends when the first data
line becomes invalid.
CKH
+ t
CKL
DDR_CLKOUT
DDR_CLKOUT
shows a DDR SDRAM write cycle.
must be less than or equal to t
MCF5275 Integrated Microprocessor Family Hardware Specification, Rev. 4
Figure 12. DDR_CLKOUT and DDR_CLKOUT Crossover Timing
Characteristic
Table 15. DDR Timing (continued)
RPRE
RPST
CK
WPRE
WPST
1
.
)
)
)
)
Symbol
t
t
t
t
WPRE
WPST
RPRE
RPST
0.25
Min
0.9
0.4
0.4
Freescale Semiconductor
V
V
V
IX
MP
IX
Max
1.1
0.6
0.6
—
V
ID
Unit
t
t
t
t
CK
CK
CK
CK