 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
VR4102 Datasheet(PDF) 252 Page - NEC |
|
|
|||||||||||||||||||||||||||||
VR4102 Datasheet(HTML) 252 Page - NEC |
|
|
252 / 701 page  CHAPTER 10 BCU (BUS CONTROL UNIT) 252 10.5 BUS OPERATIONS The bus operations of buses controlled by the BCU are described below. The BCU’s operating clock (TClock) appears in the timing chart for each bus operation. Remark # that follows signal names indicates active low. 10.5.1 ROM Access The VR4102 supports the following three modes for ROM access. Use BCUCNTREG1’s PAGEROM2/0 bits and ROMWEN2/0 bits to set the mode. x Ordinary ROM read mode (ROMWEN, PAGEROM = 00) x PageROM read mode (ROMWEN, PAGEROM = 01) x Flash Memory mode (ROMWEN = 1) (1) Ordinary ROM Read Mode Set ROMWEN = 0 and PAGEROM = 0. WROMA[2:0] (BCUSPEEDREG [2:0]) can be used to set the access time. Figures 10-1 and 10-2 show 4-byte read timing chart data for when WROMA [2:0] is set to “110”. If access uses a data size larger than 4 bytes, the Trom cycle is continued until the required access size is reached. Table 10-8. Access Times during Ordinary ROM Read Mode WROMA [2:0] Trom (TClock) 000 9 001 8 010 7 011 6 100 5 101 4 110 3 111 2 |
|
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
