AN2074 Freescale Semiconductor / Motorola, AN2074 Datasheet - Page 29

• Manufacturer Part Number: AN2074
• Description: DSP56300 JTAG Examples
• Manufacturer: Freescale Semiconductor / Motorola

START
JTAG_SAMPLE:
3.7 CLAMP Example
The CLAMP example shows how the CLAMP instruction is executed. After the SAMPLE/PRELOAD
instruction is executed as in Section 3.6, the Select-IR scan path is selected to shift in the CLAMP
instruction by sending 0101 on
data, the signals
after the CLAMP instruction is executed. Since the CLAMP instruction selects the Bypass Register to be
connected between
the Shift-DR state is entered. Table 12 describes the instructions used in Example 15.
dc
dc
dc
dc
dc
dc
dc
dc
dc
dc
org
...
jsr
jsr
debug
move
jsr
rts
B3
0
0
0
0
0
0
0
1
$04
$04
$04
$04
$04
$04
$a4
$30
$10
$00
p:$100
JTAG_RTI
JTAG_SAMPLE
#JTAG_SAMPLE_SEQ,r0
JTAG_EXECUTE
AA1
B2
0
0
0
1
1
1
1
1
TDI
; go to Shift DR
; go to Shift DR
; go to Shift DR
; go to Shift DR
; go to Shift DR
; go to Shift DR
; go to Exit DR - msb of data outSC12
; go to Update DR
; go to Run-Test-Idle
; EXIT
,
AA2
Freescale Semiconductor, Inc.
and
B1
0
0
1
0
0
1
1
1
,
For More Information On This Product,
CAS
TDO
Table 12. CLAMP Example Instructions
, and
TDI
, data shifted out on
B0
0
1
0
0
1
0
1
1
Go to: www.freescale.com
. Since the boundary scan register has been preloaded with a 144-bit
DSP56300 JTAG Examples
A[3–0]
EXTEST
SAMPLE/PRELOAD
IDCODE
HIGHZ
CLAMP
ENABLE_ONCE
DEBUG_REQUEST
BYPASS
STD1
ctrl SRD1
SRD1
ctrl SC11
SC11
ctrl SC12
are set to logic 1 and the signals
Instruction
TDO
is the same as the data shifted in on
Boundary-Scan Register
Boundary-Scan Register
ID Register
Bypass
Bypass
OnCE Register
OnCE Register
Bypass
Register Selected
A[17–4]
are set to logic 0
CLAMP Example
TDI
when
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