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XMOS xCORE-200 Multi-channel Audio board, Quick Start Manual

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XMOS xCORE-200 Multi-channel Audio board Quick Start Manual Download Page 8

xCORE-200 Clock Frequency Control

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Document History

Date

Release

Comment

2016-09-30

1.0

First release

Copyright © 2016, All Rights Reserved.

Xmos Ltd. is the owner or licensee of this design, code, or Information (collectively, the “Information”) and
is providing it to you “AS IS” with no warranty of any kind, express or implied and shall have no liability in
relation to its use. Xmos Ltd. makes no representation that the Information, or any particular implementation
thereof, is or will be free from any claims of infringement and again, shall have no liability in relation to any
such claims.

XM010761A

Summary of Contents for xCORE-200 Multi-channel Audio board

Page 1: ...clock to derive the clocks for the xCORE tiles the RGMII unit the switch and the reference clock XCore0 Tile Clk XCore1 Tile Clk Divider Stage 1 R 1 CLK Multiplier Stage F 1 2 Divider Stage 2 OD 1 Sw...

Page 2: ...mum RGMII clock System clock maximum USB clock 12 or 24 MHz Figure 2 Clock Frequency Constraints 3 PLL Settings There are three dividers within the PLL R divides the input clock down The next divider...

Page 3: ...new PLL settings should be written to PLL_CTRL causing a reset The second time the boot code executes the value read back from the PLL_CTRL register will be the reconfigured value and the boot proces...

Page 4: ...or a 400MHz sys tem clock Figure 4 Node Config uration Registers Register Bitfield Reset Description XS1_PSWITCH_PLL_CLK_DIVIDER_NUM 15 0 0 xCORE Tile clock divider XCDIV 1 Reset value produces 400MHz...

Page 5: ...pplication does not need to run the xCORE tile at full speed to work dynamic power can be saved by running the tile at a slower rate For this to work each tile has its own clock divider that is enable...

Page 6: ...ibute is specified 100MHz Figure 6 XN File Frequency Control Attributes example 500MHz 24576kHz or 6745800Hz If the frequency control attributes are not specified in the XN file then the xTIMEcomposer...

Page 7: ...tp www xmos com Type Board Type Declarations Declaration tileref tile 1 Declaration Declarations Packages Package id 0 Type XS2 UEnA 512 TQ128 Nodes Node Id 0 InPackageId 0 Type XS2 L16A 512 Oscillato...

Page 8: ...or Information collectively the Information and is providing it to you AS IS with no warranty of any kind express or implied and shall have no liability in relation to its use Xmos Ltd makes no repres...

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