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{
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"source": [
"# Chapter 11 - Sequential Logic Systems"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 11_1 Page No. 338"
]
},
{
"cell_type": "code",
"execution_count": 1,
"metadata": {
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"outputs": [
{
"name": "stdout",
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"text": [
"tsu= 2.00e-08 seconds\n",
"tpd= 3.00e-08 seconds\n",
"Tmin=tpd+tsu= 5.00e-08 seconds\n",
"fCkmax=1/Tmin = 2.00e+07 Hz\n"
]
}
],
"source": [
"from __future__ import division \n",
"tsu=20*10**(-9)\n",
"print \"tsu= %0.2e\"%(tsu),\" seconds\" # Input set-up time of second flip flop\n",
"tpd=30*10**(-9)\n",
"print \"tpd= %0.2e\"%(tpd),\" seconds\" # Input set-up time of first flip flop\n",
"Tmin=tpd+tsu\n",
"print \"Tmin=tpd+tsu= %0.2e\"%(Tmin),\" seconds\" # Minimum allowed time interval b/w threshold levels of two consecutive triggering clock edges activating two flip-flops\n",
"fCkmax=1/Tmin # formulae \n",
"print \"fCkmax=1/Tmin = %0.2e\"%(fCkmax),\" Hz\"# Maximum clock frequency at which flip-flop can operate reliably"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 11_4 Page No. 338"
]
},
{
"cell_type": "code",
"execution_count": 2,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"tphL= 4.00e-08 seconds\n",
"n= 3.00\n",
"fmax=1/(n*tphL) = 8.33e+06 Hz\n"
]
}
],
"source": [
"from __future__ import division \n",
"tphL=40*10**(-9)\n",
"print \"tphL= %0.2e\"%(tphL),\" seconds\" # Time taken from Clear to output\n",
"n=3\n",
"print \"n= %0.2f\"%(n) # Number of bits in counter i.e no. of flip-flops used\n",
"fmax=1/(n*tphL) # Using formulae fmax<= 1/(n*tphL)\n",
"print \"fmax=1/(n*tphL) = %0.2e\"%(fmax),\" Hz\"# Maximum counting rate at which flip-flop can operate reliably"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 11_6 Page No. 340"
]
},
{
"cell_type": "code",
"execution_count": 5,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"fs= 2000.00 Hz\n",
"fB= 1000000.00 Hz\n",
"part(i)\n",
"fb= fB/(10**5)=10.00 Hz\n",
"delta_t=1/fb= 0.10 seconds\n",
"fs*delta_t= 200.00\n",
"Display indication=0200\n",
"part(ii)\n",
"fb=fB/(10**3)= 1000.00 Hz\n",
"delta_t=1/fb= 0.00 seconds\n",
"fs*delta_t= 2.00\n",
"Display indication=0002\n"
]
}
],
"source": [
"from __future__ import division \n",
"fs=2*10**(3) \n",
"print \"fs= %0.2f\"%(fs),\" Hz\"# sine wave input signal frequency\n",
"fB=1*10**(6)\n",
"print \"fB= %0.2f\"%(fB),\" Hz\"# input Time-Base clock frequency\n",
"\n",
"print \"part(i)\"# part(i)of question\n",
"fb=fB/(10**5)\n",
"print \"fb= fB/(10**5)=%0.2f\"%(fb),\" Hz\"# Time-Base frequency for 5 decade counter\n",
"delta_t=1/fb\n",
"print \"delta_t=1/fb= %0.2f\"%(delta_t),\" seconds\" # Gate Time interval\n",
"DISP1=fs*delta_t\n",
"print \"fs*delta_t= %0.2f\"%(DISP1)# Display indication for 5 decade counter\n",
"print \"Display indication=0200\"# Display indication as 4-bit\n",
"\n",
"print \"part(ii)\"# part(ii)of question\n",
"fb=fB/(10**3)\n",
"print \"fb=fB/(10**3)= %0.2f\"%(fb),\" Hz\"# Time-Base frequency for 3 decade counter\n",
"delta_t=1/fb\n",
"print \"delta_t=1/fb= %0.2f\"%(delta_t),\" seconds\" # Gate Time interval for 3 decade counter\n",
"DISP2=fs*delta_t\n",
"print \"fs*delta_t= %0.2f\"%(DISP2)# Display indication for 3 decade counter\n",
"print \"Display indication=0002\"# Display indication as 4-bit"
]
}
],
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