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| 型號： | 1215E |
| 英文描述： | TEST/JTAG SUPPORT|CMOS|QFP|48PIN|PLASTIC |
| 中文描述： | 測試/ JTAG支持|的CMOS | QFP封裝| 48PIN |塑料 |
| 文件頁數(shù)： | 37/92頁 |
| 文件大小： | 1041K |
| 代理商： | 1215E |
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42
Agere Systems Inc.
User Manual
April 2001
Advanced Operational Mode
497AE and 1215E Boundary-Scan Master 2
Appendix B—BSM2 Register Descriptions (continued)
CUTI: Control-USEROUT1/Test Data/Interrupt Register (continued)
EXEC[1:0]
(Execution Bits)—These bits provide the means by which execution of a programmed scan operation
is controlled/initiated. These bits only have effect when the value of the MAN bit (below) is 0.
These bits are readable; however, executing the jump or reset operations (writing either the pattern 10
or the pattern 11) immediately resets the bits back to 00. In other words, the patterns 10 and 11 can
never be read from the EXEC bits. The pattern 01 (normal operation) is static—can be read when it is
loaded in the EXEC bits.
MAN
(TAP Manual Bit)—When the value of this bit is 1, single step scan operation (via programming of the
CUT0 register) is enabled. The single step operation is called TAP Manual Mode. When operating in
this mode, the gated clock bit (GCLK, register CSC) must be set to 0.
AMD[1:0]
(ATPG Mode Bits)—With these two bits, one of the ATPG algorithms of the BSM2 is selected. These
bits correspond to register CFGR[1:0] of the original BSM. Combined with the AC bit (CUTI[03]), the
selected algorithm’s output can be inverted before being scanned into the B-S chain currently
selected/attached to/by the BSM2.
TIOM[2:0]
(TAP I/O Mode Bits)—With these three bits, mode of test of the selected/attached B-S chain is deter-
mined. The TIOM bits provide flexibility for deterministic scan operations (see page 11), for ATPG
operation (see Scan-Sequence Modifier (SSM) and Programming ATPG and SSM Functions), and for
recirculation mode—direct connection of TDI to TDO within the BSM2 device (see Recirculation
Scan).
WARNING: The pattern 110 is illegal in the TIOM bits. The loading of 110 in the TIOM bits will result in
unpredictable operation.
EXEC[1]
EXEC[0]
Meaning
0
Do not execute.
0
1
Initiate normal execution of scan operation.
1
0
Jump to scan operation destination state and halt execution.
1
Reset device.
AMD[1]
AMD[0]
AC = 0
AC = 1
0
upcount sequence
downcount sequence
0
1
walking 1
walking 0
1
0
pseudorandom
inverted pseudorandom
1
constant 0
constant 1
TIOM[2:0]
Type of Scan Operation
Source of TDO
Destination of TDI
TVO
TVI
000
Apply stimulus, ignore results
TVO
ignore; TDI off
→TDO
off
001
Normal scan operation
TVO
TVI
→TDO TDI→
010
SSM mode with TVO as data
source and SAR as data desti-
nation
TVO
SAR
→TDO
off
011
SSM mode with ATPG as data
source and SAR as data desti-
nation
ATPG
SAR
->SSM
(if enabled)
100
Response only
no source; TDO off
TVI
off
TDI
→
101
Recirculate mode (TDI -> TDO)
TDI
TDO
off
110
Illegal—don’t use
—
111
Recirculate with response only
TDI
TDO & TVI
off
TDI
→
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