saa7142hl NXP Semiconductors, saa7142hl Datasheet - Page 57

• Manufacturer Part Number: saa7142hl
• Description: Saa7142hl Dual Video Input Processor
• Manufacturer: NXP Semiconductors

Philips Semiconductors
9397 750 15208
Product data sheet
16.1.2 Device identification 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 internally 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 30. 32 bits of identification code.
TDI
31
MSB
version
code
nnnn
4-bit
28 27
Rev. 01 — 16 January 2006
0001010110100000
16-bit part number
Figure
30.
12 11
11-bit manufacturer
00000010101
identification
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Dual video input processor
SAA7142HL
1
LSB
1
001aad239
0
TDO
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