參數(shù)資料
型號(hào)： SAA6750
廠商： NXP Semiconductors N.V.
英文描述： Encoder for MPEG2 image recording EMPIRE
中文描述： 為MPEG2編碼器帝國(guó)的形象記錄
文件頁(yè)數(shù)： 43/60頁(yè)
文件大?。?/td> 217K
代理商： SAA6750
2000 May 03
43
Philips Semiconductors
Product specification
Encoder for MPEG2 image recording
(EMPIRE)
SAA6750H
Table 25
Boundary Scan Test (BST) instructions supported by the SAA6750H
INSTRUCTION
DESCRIPTION
BYPASS
This mandatory instruction provides a minimum length serial path (1 bit) between TDI and TDO,
when no test operation of the component is required.
This mandatory instruction allows testing of off-chip circuitry and board level interconnections.
This mandatory instruction can be used to take a sample of the inputs during normal operating of
the component. It can also be used to preload data values into the latched outputs of the boundary
scan register.
This optional instruction is useful for testing, when not all ICs have BST. This instruction addresses
the bypass register, while the boundary scan register is in external test mode.
This optional instruction will provide information on the components manufacturer, part number and
version number.
EXTEST
SAMPLE
CLAMP
IDCODE
7.14.2
I
NITIALIZATION OF BOUNDARY SCAN CIRCUIT
The Test Access Port (TAP) 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 pin TRST to LOW.
7.14.3
D
EVICE IDENTIFICATION CODES
A device identification register is specified in “IEEE Std.
1149.1-1990 -IEEE Standard Test Access Port and
Boundary Scan Architecture”. 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
(nearesttoTDI)andbit 0istheleastsignificantbit(nearest
to TDO); see Fig.11.
handbook, full pagewidth
MHB670
31 28
27
11
12
1
0
MSB
LSB
0001
0010 1011 0110 0000
0000 0010 101
4 bits
version
code
16-bit part number
11-bit manufacturer
identification
1
TDI
TDO
Fig.11 32 bits of identification code.
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