Digi NS9750 Manual de usuario Pagina 40

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JTAG interface for ARM core/boundary scan
36       
NS9750B-A1 Datasheet 03/2006
JTAG interface for ARM core/boundary scan
Note: trst_n must be pulsed low to initialize the JTAG when a debugger is not attached.
Figure 6: JTAG interface
Pin # Signal name
U/D
OD
(mA)
I/O Description
AE20 tck I Test clock
AD18 tdi U I Test data in
AE19 tdo 2 O Test data out
AC18 tms U I Test mode select
AF20 trst_n U I Test mode reset
AD19 rtck U 2 I/O Returned test clock, ARM core only
Table 19: JTAG interface/boundary scan pinout
JP1 recommended
instead of R9 during
deve lopment phase,
0 = B0 TO A
NC7SB3157
U2
4
3
1
2
5
6
A
B0
B1
GND
V+
S
R13
2.4K
Should be positioned on PCB with
pin 1 facing toward board edge.
R5
2.4K
R7
2.4K
Enable
SRESETn
P1
HEADER 10X2.1SP
12
34
56
78
910
1112
1314
1516
1718
1920
R15 10K
R2
10K
Disable
NS9750B-A1
R11 0
3.3V
JP1 or R3
reset_n
3.3V
CKE
3.3V
P
JRTCK
RESET monitor
Trip = 2.93V
TD I
TR STn
D
R4
reset_n
TC K
JRTCK
D
TD O
IN
R12
2.4K
NOTES:
R7: Boot Method
out - Flash/ROM/S_CS1n
in: - SPI_B PROM to SDRAM/CS0n.
R12: PCI Arbiter
out - Internal
In - External
U2 must be duplicated for each
clock enable used
If CKE on the SDRAM devices
is connected to 3.3V dirrectly or
through a pull-up, U2 is not needed
PD_PIN19
3.3V
JTRSTn
D = Full Debug
JTAG
MODE
INPUTS
H25
AC21
AE20
AD18
AC18
AE19
AF20
AD19
AF21
AD20
AE21
D2
G2
RES ETn
RES ET_DON E
TC K
TD I
TM S
TD O
TR STn
RTCK
PLLTESTn
BISTENn
SCANENn
SRESETn
CLK_ E N [0]
U1
MAX811S
1
2
4
3
GND
RST
+V
MR
SRESETn
JP1
IN
P = Production Debug
OUT
to
SDRAM
devices
3.3V
Master RESET
OUT
R16 0
R14 10K
TM S
3.3V
JTDO
JTAG 20 PIN
HEADER..
Debug mode must be disabled on
customer units in production.
3.3V
SW1
SW_PB
R1
2.4K
R8
2.4K
Debug Mode
R10 33
R4
10K
PD_PIN17
RTCK
R3
2.4K
JTDO
C3 .001
3.3V
R9 33
R6
10K
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