 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
TMPR4956C Datasheet(PDF) 214 Page - Toshiba Semiconductor |
|
|
|||||||||||||||||||||||||||||
TMPR4956C Datasheet(HTML) 214 Page - Toshiba Semiconductor |
|
|
214 / 286 page  Chapter 11 TX4956 System Interface 11-46 EReq* (I) Indicates an external agent is requesting bus ownership of the System interface. To gain mastership of the bus, an external agent must arbitrate with the processor as follows: A) External agent asserts EReq* B) Wait for PMaster* to be deasserted (1 to N cycles). C) External agent drives SysAD and SysCmd buses. The external agent is guaranteed to maintain mastership of the bus as long as EReq* is asserted. If at any time EReq* is deasserted, the external agent must go back to step A and re-arbitrate for the bus. Figure 11.3.10 Sample Cycle with EReq* Asserted From the time that EReq* is asserted, the external agent is guaranteed to gain mastership of the bus after at most one processor request. However, if EOK* is being deasserted, the external agent will gain mastership of the bus without having to accept any processor requests. The external agent relinquishes bus mastership by deasserting EReq* as shown below: Figure 11.3.11 Sample Cycle with Deassertion of EReq* A) External agent deasserts EReq*. B) Bus is set to a tristate. C) Processor regains mastership of bus. ExtAgent Cmd ExtAgent Data C B A SysAD Cycle MasterClock SysCmd EReq* PMaster* ExtAgent Cmd ExtAgent Data Proc Data Data Cmd C B A SysAD Cycle MasterClock SysCmd EReq* PMaster* |
|
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
