Os motores de busca de Datasheet de Componentes eletrônicos |
|
AM29F080B-75EIB Folha de dados(PDF) 10 Page - Advanced Micro Devices |
|
AM29F080B-75EIB Folha de dados(HTML) 10 Page - Advanced Micro Devices |
10 / 37 page 10 Am29F080B P R E L I M I NARY Table 3. Am29F080B Autoselect Codes (High Voltage Method) Legend: L = Logic Low = VIL, H = Logic High = VIH, SGA = Sector Group Address, X = Don’t care. Note: The system may also autoselect information in-system via the command register. See Table 5. Sector Group Protection/Unprotection The hardware group sector protection feature dis- ables both program and erase operations in any sec- tor group. Each sector group consists of two adjacent sectors. Table 4 shows how the sectors are grouped, and the address range that each sector group con- tains. The hardware sector group unprotection fea- ture re-enables both program and erase operations in previously protected sector groups. Sector group protection/unprotection must be imple- mented using programming equipment. The procedure requires a high voltage (VID) on address pin A9 and the control pins. Details on this method are provided in a supplement, listed in publication number 19945. Con- tact an AMD representative to obtain a copy of the ap- propriate document. The device is shipped with all sectors unprotected. AMD offers the option of programming and protecting sector groups at its factory prior to shipping the device through AMD’s ExpressFlash™ Service. Contact an AMD representative for details. It is possible to determine whether a sector group is protected or unprotected. See “Autoselect Mode” for details. Table 4. Sector Group Addresses Temporary Sector Group Unprotect This feature allows temporary unprotection of previ- ously protected sector groups to change data in-sys- tem. The Sector Group Unprotect mode is activated by setting the RESET# pin to VID. During this mode, formerly protected sector groups can be programmed or erased by selecting the sector group addresses. Once VID is removed from the RESET# pin, all the pre v io us l y pr ote c t ed s e c t or g r oups are protected again. Figure 1 shows the algorithm, and the Temporary Sector Group Unprotect diagram shows the timing waveforms, for this feature. Figure 1. Temporary Sector Group Unprotect Operation Description CE# OE# WE# A19 to A12 A11 to A10 A9 A8 to A7 A6 A5 to A2 A1 A0 DQ7 to DQ0 Manufacturer ID: AMD L L H X X VID XL XL L 01h Device ID: Am29F080B L L H X X VID XL XL H D5h Sector Group Protection Verification LL H SGA X VID XL X H L 01h (protected) 00h (unprotected) Sector Group A19 A18 A17 Sectors SGA0 0 0 0 SA0 –SA1 SGA1 0 0 1 SA2 –SA3 SGA2 0 1 0 SA4 –SA5 SGA3 0 1 1 SA6 –SA7 SGA4 1 0 0 SA8 –SA9 SGA5 1 0 1 SA10 –SA11 SGA6 1 1 0 SA12 –SA13 SGA7 1 1 1 SA14 –SA15 START Perform Erase or Program Operations RESET# = VIH Temporary Sector Group Unprotect Completed (Note 2) RESET# = VID (Note 1) Notes: 1. All protected sector groups unprotected. 2. All previously protected sector groups are protected once again. 21503C-6 |
Nº de peça semelhante - AM29F080B-75EIB |
|
Descrição semelhante - AM29F080B-75EIB |
|
|
Ligação URL |
Privacy Policy |
ALLDATASHEETPT.COM |
ALLDATASHEET é útil para você? [ DONATE ] |
Sobre Alldatasheet | Publicidade | Contato conosco | Privacy Policy | roca de Link | Lista de Fabricantes 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 |