bdiGDB for BDI2000 (PowerPC 7440/7450/86xx) User Manual 27
© Copyright 1997-2015 by ABATRON AG Switzerland V 1.13
Daisy chained JTAG devices:
The BDI can also handle systems with multiple devices connected to the JTAG scan chain. In order
to put the other devices into BYPASS mode and to count for the additional bypass registers, the BDI
needs some information about the scan chain layout. Enter the number (count) and total instruction
register (irlen) length of the devices present before the PowerPC chip (Predecessor). Enter the ap-
propriate information also for the devices following the PowerPC chip (Successor):
SCANPRED count irlen This value gives the BDI information about JTAG devices present before
the PowerPC chip in the JTAG scan chain.
count The number of preceding devices
irlen The sum of the length of all preceding instruction regis-
ters (IR).
Example: SCANPRED 1 8 ; one device with an IR length of 8
SCANSUCC count irlen This value gives the BDI information about JTAG devices present after the
PowerPC chip in the JTAG scan chain.
count The number of succeeding devices
irlen The sum of the length of all succeeding instruction reg-
isters (IR).
Example: SCANSUCC 2 12 ; two device with an IR length of 8+4
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