Hi group,
I have been using one ByteBlasterMV for a long time now, to program a chain of 4 components in JTAG: EPM1270144 LXT971 LXT971 EPM1270144
LXT971's are Intel (Level-One) PHY's, with an Instruction Register of length 4 bits.
I run Quartus II 4.2 SP1, free Web version, on an XP PC.
I have never had the slightest problem with the MV pod.
Recently, I purchased for our manufacturing/test department one ByteBlaster II for programming the same chain of components on the same PCB, using the same setup.
Of course, I tried it first at my desk. Does not work. De-installation/re-installation of driver has been done as per Altera Web Site instructions.
MV keeps on working fine. ByteBlaster II keeps on refusing to provide reliable behaviours.
For instance:
-- accepts to erase both Altera CPLD's
-- says they are blank
-- running examine returns a message like "Bad silicon ID on device 4"
-- same thing with program/verify.
Tried with a second ByteBlaster II. Same thing. Tried with another card holding the chain of components. Same thing.
I can think of:
-- II has less drive than MV (TMS,TCK,TDI,TDO are not buffered on my card)
-- II runs faster ?
Any idea ?
Thanks beforehand.