Editor Version ×
Standard

1.Easy to use and quick to get started

2.The process supports design scales of 300 devices or 1000 pads

3.Supports simple circuit simulation

4.For students, teachers, creators

Profession

1.Brand new interactions and interfaces

2.Smooth support for design sizes of over 5,000 devices or 10,000 pads

3.More rigorous design constraints, more standardized processes

4.For enterprises, more professional users

Ongoing

STD RC2014-MSK-Z84C10-DMA

License:

Mode: Editors' pick

  • 1.8k
  • 0
  • 1
Update time: 2018-12-16 21:35:52
Creation time: 2018-09-25 09:07:31
Description
This is a DMA module for the Z80 CPU used in the RC2014. V2.0 - **This version has still a bug**. One must connect the +5V signal (available at a pin on the PCB) to the RDY single pin. I tried only memor transfers at 7.8 MHz and they seem to work without problems. So the RDY-signal was floating and this means, that the DMA did NOT release the bus again (the test program was using the continous transfer mode) and the whole computer was not working (no M1 signal was found). After a RESET the DMA requested the bus at once. The debug signal PIN_READY ist not connected
Design Drawing
schematic diagram
1 /
PCB
1 /
The preview image was not generated, please save it again in the editor.
ID Name Designator Footprint Quantity Mounted
1 Z84C10-Z80DMA-DIP Z84C10-DEV-A DIP40 1 Yes undefined
2 Bus RC2014/80 U3 HDR-2.54-19-2X40P 1 Yes undefined
3 Header-Male-2.54_2x2 P3-BAO,P2-BAI,P-USR-IEI/O HDR-2X2/2.54 3 Yes C66690
4 Header-Male-2.54_1x5 H1-DBG DIP-1X5P-2.54MM-M 1 Yes C124379
5 4k7 R2-CLK,R3-INT AXIAL-0.3 2 Yes
6 2k R1-BUSREQ AXIAL-0.3 1 Yes
7 74LS157 U2-157 DIP16 1 Yes
8 100nF C1-157,C2-DMA,C3-688-100NF RAD-0.1 3 Yes
9 Header-Male-2.54_1x2 P-EXT-IEI/O HDR-2X1/2.54 1 Yes C86471
10 74HCT688 U-HCT688 PDIP-20 1 Yes 595-CD74HCT688E
11 8x10k RP1-10K SIL-9 1 Yes
12 Header-Male-2.54_2x6 P4-PORTADDRESS HDR-6X2/2.54 1 Yes C124388
13 Header-Male-2.54_1x1 P1-RDY HDR-1X1/2.54 1 Yes C81276

Unfold

Project Attachments
Empty
Project Members
Related Projects
Change a batch
Loading...
Add to album ×

Loading...

reminder ×

Do you need to add this project to the album?

服务时间

周一至周五 9:00~18:00
  • 0755 - 2382 4495
  • 153 6159 2675

服务时间

周一至周五 9:00~18:00
  • 立创EDA微信号

    easyeda

  • QQ交流群

    664186054

  • 立创EDA公众号

    lceda-cn