TCM4400E Datasheet, PDF (36/64 Pages) Texas Instruments – GSM/DCS BASEBAND AND VOICE A/D AND D/A RF INTERFACE CIRCUIT

TCM4400E
GSM/DCS BASEBAND AND VOICE A/D
AND D/A RF INTERFACE CIRCUIT
SLWS082A – JULY 1999 – REVISED MARCH 2000
PRINCIPLES OF OPERATION
JTAG interface
TCM4400E provides a JTAG interface according to IEEE Std1149.1. This interface uses five dedicated IOs:
TCK (test clock), TMS (test mode select), TDI (scan input), TDO (scan output), and TRST (test reset). Inputs
TMS,TDI, and TRST contain a pullup device which makes their state high when they are not driven. Output TDO
is a 3-state output which is Hi-Z except when data are shifted between TDI and TDO. TRST input is intended
for proper initialization of the state machine test access port (TAP) and boundary scan cells. System RESET
is sent into the device through a boundary-scan register, which has to be initialized by TRST to allow the RESET
signal to be propagated into the device; a good practice should be to connect RESET and TRST terminals
together.
standard user instructions available.
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _NAME
OPCODE
DESCRIPTION
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _BYPASS
11111 Connects the by-pass register between TDI and TDO.
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{SAMPLE/PRELOAD}
00010
Connects the boundary scan register between TDI and TDO. This mode captures a snapshot of the state
of the digital I/Os of the device.
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ^EXTEST
00000
Connects the boundary scan register between TDI and TDO. This mode captures the state of the input
terminals and forces the state of the output pins. This mode is intended for printed-circuit board
connections testing between devices.
IDCODE
00001 Connects the identification register between TDI and TDO. This is the default configuration at reset.
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _INTEST
00011
Connects the boundary scan register between TDI and TDO. This mode forces the internal system input
signals via the parallel latches of the boundary register and captures internal system outputs. The mode
performs device internal tests independently of the state of its input terminals. In this mode the internal
system master clock is derived from TCK and is active in the run-test-idle state of the state machine to
allow step-by-step operation of the device.
JTAG interface scan chains description
bypass register
0
TDI
1
TDO
instruction register
0
0
0
0
0
TDI
5
4
3
2
1
TDO
identification register
0
0
1
0
0
0
0
0
0
0
0
0
0
0
1
1
TDI
32
31
30
29
28 27
26
25
24
23
22
21
20
19
18
17
0
1
0
1
0
0
0
0
0
0
1
0
1
1
1
1
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
TDO
36
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