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參數資料
| 型號： | 935261504518 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP44 |
| 封裝： | PLASTIC, SOT-307, QFP-44 |
| 文件頁數： | 29/87頁 |
| 文件大小： | 440K |
| 代理商： | 935261504518 |
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1999 Jul 01
35
Philips Semiconductors
Product specication
9-bit video input processor
SAA7113H
9.1
Initialization of boundary scan circuit
The TAP (Test Access Port) controller of an IC should be
in the reset state (TEST_LOGIC_RESET) when the IC is
in functional mode. This reset state also forces the
instruction register into a functional instruction such as
IDCODE or BYPASS.
To solve the power-up reset, the standard specifies that
the TAP controller will be forced asynchronously to the
TEST_LOGIC_RESET state by setting the TRST pin
LOW.
9.2
Device identication codes
A device identification register is specified in
“IEEE Std.
1149.1b-1994”. It is a 32-bit register which contains fields
for the specification of the IC manufacturer, the IC part
number and the IC version number. Its biggest advantage
is the possibility to check for the correct ICs mounted after
production and determination of the version number of ICs
during field service.
When the IDCODE instruction is loaded into the BST
instruction register, the identification register will be
connected between TDI and TDO of the IC.
The identification register will load a component specific
code during the CAPTURE_DATA_REGISTER state of
the TAP controller and this code can subsequently be
shifted out. At board level this code can be used to verify
component manufacturer, type and version number.
The device identification register contains 32 bits,
numbered 31 to 0, where bit 31 is the most significant bit
(nearest to TDI) and bit 0 is the least significant bit (nearest
to TDO); see Fig.25.
Fig.25 32 bits of identification code.
handbook, full pagewidth
MHB332
00000010101
0111000100010011
nnnn
4-bit
version
code
16-bit part number
11-bit manufacturer
identification
TDI
TDO
31
MSB
LSB
28 27
12 11
1
0
1
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