Albatron Technology ARM11/Cortex-A8 Daisy chained Jtag devices, ARM chip in the Jtag scan chain

bdiGDB for GNU Debugger, BDI2000 (ARM11/Cortex-A8) User Manual 30

Daisy chained JTAG devices:

For ARM targets, 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 ARM chip (Predecessor). En- ter the appropriate information also for the devices following the ARM chip (Successor):

SCANPRED count irlen	This value gives the BDI information about JTAG devices present before
	the ARM 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
	ARM 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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