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SAA7154E Datasheet(PDF) 76 Page - NXP Semiconductors |
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SAA7154E Datasheet(HTML) 76 Page - NXP Semiconductors |
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76 / 90 page  SAA7154E_SAA7154H_2 © NXP B.V. 2007. All rights reserved. Product data sheet Rev. 02 — 6 December 2007 76 of 90 NXP Semiconductors SAA7154E; SAA7154H Multistandard video decoder with comb filter 12.1.1 Initialization 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 the TRST_N pin to LOW. 12.1.2 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 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 (closest to TDI) and bit 0 is the least significant bit (closest to TDO); see Figure 25. SAMPLE This mandatory instruction can be used to take a sample of the inputs during normal operation of the component. It can also be used to preload data values into the latched outputs of the boundary scan register. CLAMP 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. IDCODE This optional instruction will provide information on the components manufacturer, part number and version number. Table 45. BST instructions supported by the SAA7154E; SAA7154H …continued Instruction Description Fig 25. 32 bits of identification code 001aab946 0000 0010 101 0110 0011 0001 1001 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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