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Comp.Arch.FPGA | error occurred when downloading in ML310 board: OPB ERR red light - microblaze EDK tutorial

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error occurred when downloading in ML310 board: OPB ERR red light - microblaze EDK tutorial - Hur - 2005-01-08 13:56:00

One problem when i practice the EDK tutorial
.....and download the bitstream
into ML310.....
Using Base system builder,I think the platform define, netlist generation,
implementation, software (TestApp.c - LED flash) compilation are all okay.
(No error found)

But when I (for the first time --: ) download (in XPS), I found the problems
below

1. In hyperterminal,
- I see the message
  "DDR_SDRAM_32M*64
  Running 32bit Test"

and then it is stuck

2. In ML310 board, i see the both of  LEDs "OPB_ERR" and "PLB_ERR" are
red
!!
    (Meanwhile, the LED "DBG 3" is only green, other "DBG" LED does
not
flash.

If someone knows what kind of problem this is.....could tell me what is the
problem.....