step6_worksheet

step6_worksheet - have graphed above operate the NEC...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
ECEL 304 ECE Laboratory IV Electrical and Computer Engineering Drexel University Dr. Fontecchio Step 6 Prelab Complete this worksheet before doing Step 6 of the Digital Recording Project. 1. Read the data sheets for the 74LS112 JK Flip Flop, 74LS08 AND gate, and 74LS590 8-bit counter. 2. Consider the RAM read/write control circuit from Step 4’s simulation (Figure 1), where WE=write enable, RE=read enable, OE=output enable. Figure 1. Read/Write Control Sketch the WE and RE waveforms expected from this RAM read/write control circuit on figure 2
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Figure 2. Performance of read/write control drawn in figure 1 Table 1. NEC 128x8k RAM Read/Write Mode Control WE OE MODE L X WRITE H L READ L=low, H=high, X=don’t care Our RAM chip, the NEC uPD431000A, has active-low inputs (see Table 1 or see the uPD431000A data sheet for a complete mode control table). Does the control logic you
Background image of page 2
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 4
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: have graphed above operate the NEC uPD431000A chip properly, i.e. does it satisfy the table above? YES NO If your answer is YES, you are done. However, you would be wrong and should look again. If your answer is NO, then do the following. Redesign the control logic to properly operate the active-low inputs of the NEC uPD431000A. Keep it simple! Remember that the only gates you have to work with are AND gates, JKFFs, and inverters. On the next page, draw a revised schematic and a revised waveform graph, indicating the write and read operating regions. ECE-L304 ECE Laboratory IV Name ________________________ Step 6. Revised Control Circuit Worksheet Name ________________________ Date ______________ Revised Schematic Revised Waveforms...
View Full Document

This note was uploaded on 04/05/2010 for the course ECEC 304 taught by Professor Peters during the Summer '09 term at Drexel.

Page1 / 4

step6_worksheet - have graphed above operate the NEC...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online