Intel® dcpxa250 processor card, Vcc_pll and vcc_core pin voltage must be equal, 50mhz sdram requires 0ohm resistors – Intel DBPXA250 User Manual
Page 16: Intel, Fixed, Mhz sdram requires 0-ohm resistors, Dcpxa250 processor card
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DBPXA250 and DBPXA210 Development Platforms Specification Update
Intel
®
DCPXA250 Processor Card
Intel
®
DCPXA250 Processor Card
3.
VCC_PLL And VCC_CORE Pin Voltage Must Be Equal
Problem:
The Intel
®
PXA250 and PXA210 Application Processors Developer’s Manual states VCC_PLL
requires VCC_CORE voltage instead of a separate voltage supply.
Implication:
The PXA250 processor may not work if VCC_PLL is not equal to VCC_CORE.
Workaround:
Perform the following steps to fix the problem.
1. Remove R9.
2. Add a 30-AWG wire from the R9 pad (inductor L2 side) to the positive side of C29. This can
be done on the top of the board.
Status:
Fixed
Board Rev:
Rev C
6.
50-MHz SDRAM Requires 0-ohm Resistors
Problem:
Incorrect value resistor packs installed on Rev C DCPXA250 processor cards.
Implication:
SDRAM at 50 MHz could fail.
Workaround:
Replace RP7, RP8, RP9, RP12, RP13, RP15, RP16, RP17, RP18, RP19, RP20, RP21B, RP23B,
RP25B, RP26B, RP27B, RP28B with a 0-ohm resistor pack (Bourns CAY16-000J4). 0-ohm
resistors are recommended by the Intel® PXA250 and PXA210 Applications Processors Design
Guide.
Status:
Fixed
Board Rev:
Rev C
Figure 6. R9 Pad to C29