OMAP3525-HIREL Datasheet, PDF (157/239 Pages) Texas Instruments – OMAP3525-HiRel and OMAP3530-HiRel Applications Processors

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OMAP3525-HiRel and OMAP3530-HiRel Applications Processors
SPRS599 – JUNE 2009
Table 6-19. LPDDR Signal Terminations (continued)
NO.
PARAMETER
2
ADDR_CTRL Net Class
3
Data Byte Net Classes
(DQS0-DQS3, DQ0-DQ3)
MIN
TYP
MAX
UNIT
0
22
Zo
Ω
0
22
Zo
Ω
(2) Terminator values larger than typical only recommended to address EMI issues.
(3) Termination value should be uniform across net class.
6.4.2.7 LPDDR CK and ADDR_CTRL Routing
NOTES
See Notes⁽¹⁾,⁽²⁾,⁽³⁾
See Notes⁽¹⁾,⁽²⁾,⁽³⁾
Figure 6-21 shows the topology of the routing for the CK and ADDR_CTRL net classes. The route is a
balanced T as it is intended that the length of segments B and C be equal. In addition, the length of A
should be maximized.
A1
A
A1
T
OMAP
Figure 6-21. CK and ADDR_CTRL Routing and Topology
Table 6-20. CK and ADDR_CTRL Routing Specification
NO.
PARAMETER
1
Center to Center CK-CK spacing
2
CK A to B/A to C Skew Length Mismatch
3
CK B to C Skew Length Mismatch
4
Center to Center CK to other
LPDDR trace spacing
5
CK/ADDR_CTRL nominal trace length
6
ADDR_CTRL to CK Skew Length Mismatch
7
ADDR_CTRL to ADDR_CTRL
Skew Length Mismatch
8
Center to Center ADDR_CTRL to other
LPDDR trace 4w spacing
9
Center to Center ADDR_CTRL to other
ADDR_CTRL 3w trace spacing
10
ADDR_CTRL A to B/A to C Skew Length
Mismatch
11 ADDR_CTRL B to C Skew Length Mismatch
MIN
4w
CACLM-50
4w
3w
TYP
CACLM
MAX
2w
25
25
CACLM+50
100
100
100
100
UNIT
Mils
Mils
Mils
Mils
Mils
Mils
Mils
NOTES
See Note⁽¹⁾
See Note⁽²⁾
See Note⁽³⁾
See Note⁽²⁾
See Note⁽²⁾
See Note⁽¹⁾
(1) Series terminator, if used, should be located closest to device.
(2) Center to center spacing is allowed to fall to minimum (w) for up to 500 mils of routed length to accommodate BGA escape and routing
congestion.
(3) CACLM is the longest Manhattan distance of the CK and ADDR_CTRL net classes.
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TIMING REQUIREMENTS AND SWITCHING CHARACTERISTICS 157