TAP controller

Pause DR, Exit2 DR, Update DR, SEIJR.Scan, CapJR, ShftJR, Exit1 JR, 

TRST in stdjogic) end tap controller architecture behv of tap controller is signal pstate, nstate tap states begin 

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Because EPA was so slow in promulgating standards for HAPs prior to the 1990 Amendments, most states developed and implemented their own TAP control programs. Such programs, as well as the pollutants they regulate, differ widely from state to state. The ambient standards for a given substance are usually selected to be some small fraction of the TLV for that substance. 

All valves or taps controlling the entry of steam or hot water are closed and securely locked. Where the boiler has a blow-off pipe in common with one or more other boilers or delivering into a common blow-off vessel or sump, the blow-off valve or tap on each boiler is so constructed that it can only be opened by a key which cannot be removed until the valve or tap is closed. There can be only one key in use for that set of blow-off valves or taps. 

You can load Ultrafont +, enter NEW to reset some BASIC pointers, load a program you re working on, then SYS 49152 to Ultrafont -t- to add DATA to the end of the program. The DATA statements always start at line 63000, so you may want to renumber them. If you press CONTROL-D twice, another set of DATA statements will be appended, also numbered from line numbers 63000 and up. Since the keys repeat if held down, just tap CONTROL-D. If you hold it down, you may find a hundred DATA statements have been created See the notes at the end of this article for more details on using DATA statements in your own programs. 

The TAP controller is a synchronous finite-state machine whose state diagram is shown in Figure 3.1. It has a single input TMS and its outputs are signals corresponding to different states of the state-machine. Example 3.1 ows the VHDL description of the TAP controller. The TAP controller described conforms to the... 

In this section, a testbench for the TAP controller discussed in section 3.1.1 is diown. Stimulus is directly applied in the VHDL code. The outputs can be viewed in a waveform viewer provided with any VHDL simulator. 

U1 tap controller port map (control,clock,stateout,reset) ... 

Example 3.3 Testing TAP Controller Using TEXTIO package pack is... 

This VHDL testbench shows a template for testing the TAP Controller using File TEXTIO... 

At the start of simulation, all the sequential elements on the ASIC including those in the TAP controller are uninitialized. Since the TAP controller does not have a reset pin (either synchronous or asynchronous) the "U"s keeps propagating to the data pin of the flops thereby not being able to move the TAP controller to the Idle state. One way is to arbitrarily initialize the state vector of the TAP controller to a known value at the start of simulation and then simulate your regular functional vectors. If you are using Synopsys VHDL System Simulator for your gate-level simulation, the VSS commands hold and assign can be used to clock a known arbitrary value into the TAP controller. 

Chapter 3 covers the simulation steps, i.e., both functional or behavioral simulation of the HDL and the post-sfynthesis or gate-level simulation. This chapter has been included, primarily, to help the reader understand the design flow better. An example VHDL code of TAP controller is provided along with its testbench. The steps to perform behavioral simulation, and gate level simulation after synthesis have been discussed. The simulator used here is the Synopsys VHDL System Simulator (VSS). However, discussion on VSS is beyond the scope of this book. 

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