Motor de Búsqueda de Datasheet de Componentes Electrónicos |
|
AM29F016-150ECB Datasheet(PDF) 11 Page - Advanced Micro Devices |
|
AM29F016-150ECB Datasheet(HTML) 11 Page - Advanced Micro Devices |
11 / 36 page Am29F016 11 Table 4. Sector Group Addresses Write Device erasure and programming are accomplished via the command register. The contents of the register serve as inputs to the internal state machine. The state machine outputs dictate the function of the device. The command register itself does not occupy any ad- dressable memory location. The register is a latch used to store the commands, along with the address and data information needed to execute the command. The command register is written to by bringing WE to VIL, while CE is at VIL and OE is at VIH. Addresses are latched on the falling edge of WE or CE, whichever happens later; while data is latched on the rising edge of WE or CE, whichever happens first. Standard micro- processor write timings are used. Refer to AC Write Characteristics and the Erase/Pro- gramming Waveforms for specific timing parameters. Sector Group Protection The Am29F016 features hardware sector group protec- tion. This feature will disable both program and erase operations in any combination of eight sector groups of memory. Each sector group consists of four adjacent sectors grouped in the following pattern: sectors 0 –3, 4 –7, 8–11, 12–15, 16–19, 20–23, 24–27, and 28–31 (see Table 4). The sector group protect feature is en- abled using programming equipment at the user’s site. The device is shipped with all sector groups unpro- tected. Alternatively, AMD may program and protect sector groups in the factory prior to shipping the device (AMD’s ExpressFlash™ Service). It is possible to determine if a sector group is protected in the system by writing an Autoselect command. Per- forming a read operation at the address location XX02H, where the higher order address bits A18, A19, and A20 is the desired sector group address, will pro- duce a logical “1” at DQ0 for a protected sector group. See Table 2 for Autoselect codes. Temporary Sector Group Unprotect This feature allows temporary unprotection of previ- ously protected sector groups of the Am29F016 device in order to change data in-system. The Sector Group Unprotect mode is activated by setting the RESET pin to high voltage (12V). During this mode, formerly pro- tected sector groups can be programmed or erased by selecting the sector group addresses. Once the 12 V is taken away from the RESET pin, all the previously pro- tected sector groups will be protected again. Refer to Figures 15 and 16. Command Definitions Device operations are selected by writing specific ad- dress and data sequences into the command register. Writing incorrect address and data values or writ- ing them in the improper sequence will reset the device to the read mode. Table 5 defines the valid register command sequences. Note that the Erase Suspend (B0H) and Erase Resume (30H) commands are valid only while the Sector Erase operation is in progress. Moreover, both Reset/Read commands are functionally equivalent, resetting the device to the read mode. A20 A19 A18 Sectors SGA0 0 0 0 SA0 –SA3 SGA1 0 0 1 SA4 –SA7 SGA2 0 1 0 SA8 –SA11 SGA3 0 1 1 SA12 –SA15 SGA4 1 0 0 SA16 –SA19 SGA5 1 0 1 SA20 –SA23 SGA6 1 1 0 SA24 –SA27 SGA7 1 1 1 SA28 –SA31 |
Número de pieza similar - AM29F016-150ECB |
|
Descripción similar - AM29F016-150ECB |
|
|
Enlace URL |
Política de Privacidad |
ALLDATASHEET.ES |
¿ALLDATASHEET es útil para Ud.? [ DONATE ] |
Todo acerca de Alldatasheet | Publicidad | Contáctenos | Política de Privacidad | Intercambio de Enlaces | 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 |