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Design an 8 GB memory subsystem for a desktop PC system employing DDR3 SDRAM chips on a standard DIMM with ECC and 72 data lines (for data and ECC). The SDRAM chips use a 1KB page size, 8 banks, and tRCD = CL. The DIMMs employed are 4GB PC3-19200 with timing (10-12-12-31) a) How many SDRAMs are on the DIMM if 512M x 8 SDRAMs are used? b) How many ranks would there be per DIMM? c) How many ranks are there in the memory system? d) What would be the impact of using 256M x 16 SDRAMs on the memory organization? Are there any disadvantages? e) What is the maximum bandwidth of one DIMM? f) How much time (in ns) is required from the presentation of the activate command until the end of the cycle during which the last bytes of data are transferred? Assume the bank is precharged. g) Assuming we could always arrange it so that the bytes we want from memory are among the first 8 bytes of the burst, how much faster on average can we expect to get the data? Assume that the memory controller implements a closed-page policy, pre-charging after each access to a bank. Give your answer as a percentage improvement over not using this technique.
h) What is the ratio of the amount of time it will take to complete a read from a location requiring a bank activate command (page empty) versus a read from a location in an already open page (page hit)? i) Assume a scenario in which the memory controller implements an open page policy. If a long sequence of memory references results in all page misses, what bandwidth can we expect? j) How does the result in (i) above compare with the maximum theoretical maximum bandwidth of the PC3-19200 DIMM?
Determine experimentally the value of a resistor that when placed across the battery will make a measurable change in measured battery voltage. Keep the voltage decrease from open circuit value to 10% or less.
A wound-field dc motor is driving a load whose torque requirement increases linearly with speed and reaches 5 Nm at a speed of 1,400 rpm. The armature terminal voltage is held to its rated value.
A current of 1600 A exists in a rectangular (0.4-by-16cm) bus bar. The current is due to free electrons moving through the wire at an average velocity of v meters/second. If the concentration of free electrons is 10^29 electrons per cubic meter
A silicon wafer is uniformly doped with 5.5 X 10^16 phosphorus atoms/cm^3 and 4.5 X 10^16 boron atoms/cm^3. a) Find the electron and hole concentrations, the electrons andhole mobilities, and the resistivity of this silicon material at300K.
When the input x(t) = 5u(t) is applied to a linear second-order circuit the response of the state variable is y(t) = 10e^(-100t)-5e^(-200t) + 5. Design a simple RLC circuit that would produce all of these responses.
A meter being used for a 2-wire resistance measurement has an internal current source of 1 mA. If the meter's test leads have equal resistances of 0.06-ohm, what is the measured resistance for: A resistor of actual value 0.5-ohm
a certain ideal voltage generator is characterized as v(t) = 40 sin 377 t . If this generator is measured with a DC voltmeter, the instrument reads 12 volts, what is the rms value of this voltage waveform
a)How large a parallel resistor Ra mustbe placed in parallel with the D'Arsonval meter movement toextend its useful measuring range to 1A b)For the design completed in Prob. a determine themeasured current that flows when the D'Arsonval metermove..
Calculate the following. a) What is the magnitude of the voltage in a wall socket if the effective voltage is 240 Vrms b) What is the magnitude of the current if the effective current is 360 mArms
Let h(t)= (1/(R*C))*(e^(1/(R*C)))*u(t) be the impulse of an RC circuit and x(t)= u(t) an input to that circuit. 1. Find X(jω) and H(jω), which are the Fourier transforms of x(t) and h(t). 2. Form the product Y(jω)=H(jω)*X(jω) the Fourier transform of..
Does the degree of difficulty change when switch from solving a two loop mesh circuit to a three loop mesh circuit Why and why not
how can i mix ticl4 and h2o? i want to prepare tio2 nanoparticles. what should be the ratio of ticl4 and water.
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