935263595557 NXP Semiconductors, 935263595557 Datasheet - Page 68

• Manufacturer Part Number: 935263595557
• Manufacturer: NXP Semiconductors

Specifications of 935263595557

• Lead Free Status / Rohs Status: Compliant

Philips Semiconductors
9397 750 14231
Product data sheet
16.1.1 Initialization of boundary scan circuit
16.1.2 Device identification codes
The Test Access Port (TAP) controller of an IC should be in the reset state
(TEST_LOGIC_RESET) when the IC is in the 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.
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 pins 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 42. 32 bits of identification code
Figure
TDI
42).
31
MSB
version
nnnn
code
4-bit
28 27
Rev. 03 — 9 May 2005
0111000100010011
16-bit part number
12 11
11-bit manufacturer
00000010101
identification
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
9-bit video input processor
SAF7113H
1
LSB
1
0
mhb332
TDO
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