 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
Z8018010FSC Datasheet(PDF) 41 Page - Zilog, Inc. |
|
|
|||||||||||||||||||||||||||||
Z8018010FSC Datasheet(HTML) 41 Page - Zilog, Inc. |
|
|
41 / 124 page  Z 8018x Fam il y M PU Use r M anual 26 UM005001-ZMP0400 When the bus is released, the address (A0–A19), data (D0–D7), and control (MREQ, IORQ, RD, and WR) signals are placed in the high impedance state. Dynamic RAM refresh is not performed when the Z8X180 has released the bus. The alternate bus master must provide dynamic memory refreshing if the bus is released for long periods of time. Figure 16 illustrates BUSREQ/BUSACK bus exchange during a memory read cycle. Figure 17 illustrates bus exchange when the bus release is requested during a Z8X180 CPU internal operation. BUSREQ is sampled at the falling edge of the system clock prior to T3, T1 and Tx (BUS RELEASE state). If BUSREQ is asserted Low at the falling edge of the clock state prior to Tx, another Tx is executed. Figure 16. Bus Exchange Timing During Memory Read Phi A0 –A19 T1 T1 TX TX T3 TW T2 T1 RD, WR D0 –D7 MREQ IORQ BUSREQ BUSACK CPU memory read cycle Bus release cycle CPU cycle |
|
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 |
New Zealand ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
