 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
Z80 Datasheet(PDF) 180 Page - Zilog, Inc. |
|
|
|||||||||||||||||||||||||||||
Z80 Datasheet(HTML) 180 Page - Zilog, Inc. |
|
|
180 / 330 page  <%27 2GTKRJGTCNU 7UGT /CPWCN UM008101-0601 Direct Memory Access Bus Release on Match When the DMA is programmed to stop (release the bus) on match in Burst or Continuous modes, a match causes BUSREQ to go inactive on the next DMA operation, for example, at the end of the next read in search-only, simultaneous transfer/searches, or at the end of the following write in sequential transfer or transfer/searches (Figure 68). Figure 68. Bus Release on Match (Burst and Continuous Modes) Because of the pipelining scheme, matches are determined while the next DMA read or write is being performed. Table 12 lists the number of bytes transferred in any class or mode. The RDY line can go inactive after the matching operation begins without affecting this bus-release timing. However, the time at which RDY goes inactive can affect the number of bytes transferred, as described in Table 11 and Figure 32. Bus Release on Not Ready Burst mode, when RDY goes inactive, causes BUSREQ to go High on the next rising edge of CLK after the completion of its current byte operation, for example, at the end of the current read in search-only, simultaneous transfer/search, or at the end of the following write in sequential transfer/ BUSREQ RDY Byte n DMA Inactive Read in Byte n+1 and on Byte n Read in Match Found Active Inactive CLK |
|
Link URL |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link to Datasheet | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
