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SCAN182245CSSCQB Datasheet(PDF) 4 Page - National Semiconductor (TI) |
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SCAN182245CSSCQB Datasheet(HTML) 4 Page - National Semiconductor (TI) |
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4 / 18 page  Description of BOUNDARY-SCAN Circuitry The scan cells used in the BOUNDARY-SCAN register are one of the following two types depending upon their loca- tion Scan cell TYPE1 is intended to solely observe system data while TYPE2 has the additional ability to control sys- tem data (See IEEE Standard 11491 Figure 10-11 for a further description of scan cell TYPE1 and Figure 10-12 for a further description of scan cell TYPE2) Scan cell TYPE1 is located on each system input pin while scan cell TYPE2 is located at each system output pin as well as at each of the two internal active-high output enable signals AOE controls the activity of the A-outputs while BOE controls the activity of the B-outputs Each will activate their respective outputs by loading a logic high The BYPASS register is a single bit shift register stage iden- tical to scan cell TYPE1 It captures a fixed logic low Bypass Register Scan Chain Definition Logic 0 TLF11657 – 17 SCAN182245A Product IDCODE (32-Bit Code per IEEE 11491) Version Entity Part Manufacturer Required by Number ID 11491 0000 111111 0000000000 00000001111 1 MSB LSB The INSTRUCTION register is an 8-bit register which cap- tures the default value of 10000001 (SAMPLEPRELOAD) during the CAPTURE-IR instruction command The benefit of capturing SAMPLEPRELOAD as the default instruction during CAPTURE-IR is that the user is no longer required to shift in the 8-bit instruction for SAMPLEPRELOAD The se- quence of CAPTURE-IR x EXIT1-IR x UPDATE-IR will update the SAMPLEPRELOAD instruction For more information refer to the section on instruction definitions Instruction Register Scan Chain Definition TLF11657 – 10 MSB x LSB Instruction Code Instruction 00000000 EXTEST 10000001 SAMPLEPRELOAD 10000010 CLAMP 00000011 HIGH-Z 01000001 SAMPLE-IN 01000010 SAMPLE-OUT 00100010 EXTEST-OUT 10101010 IDCODE 11111111 BYPASS All Others BYPASS http www nationalcom 4 |
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