LSI Logic Confidential
17-2
JTAG Boundary Scan
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
17.1 JTAG Instruction Set
The DMN-8600 processor JTAG instructions are three bits in length,
encoded as shown in
The Private instructions are “hazardous” as defined by 1149.1 and
should not be used.
Note:
The DMN-8600 processor does not load the BYPASS
instruction into the tap controller's instruction register when
the controller is in the test-logic-reset state. The instruction
loaded instead selects a 32-bit data register (set to
0x1FFFFFFF when exiting the Capture-DR state) between
TDI and TDO.
17.2 Boundary Scan Chain Cells
The Boundary Scan Chain Cells are listed in
. Cell #1 is
closest to TDO, cell #595 is closest to TDI. Note: There are two flip-flops
for each pad on the chain: one control flip-flop and one data flip-flop. Not
all pads are on the boundary scan chain. Open-drain outputs can be
driven HIGH via the EXTEST instruction. If this is hazardous to system
Table 17.1
JTAG Instruction Set
Opcode[2:0]
Instruction
000
EXTEST
001
SAMPLE/PRELOAD
010–1110
Private
111
BYPASS
Содержание DMN-8600
Страница 14: ...LSI Logic Confidential xiv Contents Copyright 2001 2002 by LSI Logic Corporation All rights reserved ...
Страница 18: ...LSI Logic Confidential xviii Copyright 2001 2002 by LSI Logic Corporation All rights reserved ...
Страница 64: ...LSI Logic Confidential 7 6 Memory Mapping Copyright 2001 2002 by LSI Logic Corporation All rights reserved ...