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AM1802 Datasheet(PDF) 89 Page - Texas Instruments |
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AM1802 Datasheet(HTML) 89 Page - Texas Instruments |
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89 / 180 page  AM1802 www.ti.com SPRS710C – NOVEMBER 2010 – REVISED MARCH 2012 5.11.3.2 Compatible JEDEC DDR2/mDDR Devices Table 5-25 shows the parameters of the JEDEC DDR2/mDDR devices that are compatible with this interface. Generally, the DDR2/mDDR interface is compatible with x16 DDR2/mDDR-400 speed grade DDR2/mDDR devices. The device also supports JEDEC DDR2/mDDR x8 devices in the dual chip configuration. In this case, one chip supplies the upper byte and the second chip supplies the lower byte. Addresses and most control signals are shared just like regular dual chip memory configurations. Table 5-25. Compatible JEDEC DDR2/mDDR Devices NO. PARAMETER MIN MAX UNIT 1 JEDEC DDR2/mDDR Device Speed Grade(1) DDR2/mDDR-400 2 JEDEC DDR2/mDDR Device Bit Width x8 x16 Bits 3 JEDEC DDR2/mDDR Device Count(2) 1 2 Devices (1) Higher DDR2/mDDR speed grades are supported due to inherent JEDEC DDR2/mDDR backwards compatibility. (2) Supported configurations are one 16-bit DDR2/mDDR memory or two 8-bit DDR2/mDDR memories 5.11.3.3 PCB Stackup The minimum stackup required for routing the device is a six layer stack as shown in Table 5-26. Additional layers may be added to the PCB stack up to accommodate other circuitry or to reduce the size of the PCB footprint.Complete stack up specifications are provided in Table 5-27. Table 5-26. Device Minimum PCB Stack Up LAYER TYPE DESCRIPTION 1 Signal Top Routing Mostly Horizontal 2 Plane Ground 3 Plane Power 4 Signal Internal Routing 5 Plane Ground 6 Signal Bottom Routing Mostly Vertical Table 5-27. PCB Stack Up Specifications NO. PARAMETER MIN TYP MAX UNIT 1 PCB Routing/Plane Layers 6 2 Signal Routing Layers 3 3 Full ground layers under DDR2/mDDR routing region 2 4 Number of ground plane cuts allowed within DDR routing region 0 5 Number of ground reference planes required for each DDR2/mDDR routing layer 1 6 Number of layers between DDR2/mDDR routing layer and reference ground plane 0 7 PCB Routing Feature Size 4 Mils 8 PCB Trace Width w 4 Mils 8 PCB BGA escape via pad size 18 Mils 9 PCB BGA escape via hole size 8 Mils 10 Device BGA pad size(1) 11 DDR2/mDDR Device BGA pad size(2) 12 Single Ended Impedance, Zo 50 75 Ω 13 Impedance Control(3) Z-5 Z Z+5 Ω (1) Please refer to the Flip Chip Ball Grid Array Package Reference Guide (SPRU811) for device BGA pad size. (2) Please refer to the DDR2/mDDR device manufacturer documentation for the DDR2/mDDR device BGA pad size. (3) Z is the nominal singled ended impedance selected for the PCB specified by item 12. Copyright © 2010–2012, Texas Instruments Incorporated Peripheral Information and Electrical Specifications 89 Submit Documentation Feedback Product Folder Link(s): AM1802 |
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