Zakładka z wyszukiwarką danych komponentów |
|
AM29F800B-120FIB Arkusz danych(PDF) 9 Page - Advanced Micro Devices |
|
AM29F800B-120FIB Arkusz danych(HTML) 9 Page - Advanced Micro Devices |
9 / 41 page 8/18/97 Am29F800T/Am29F800B 9 PR E L IM IN A R Y In the standby mode the outputs are in the high imped- ance state, independent of the OE input. Output Disable With the OE input at a logic high level (VIH), output from the device is disabled. This will cause the output pins to be in a high impedance state. Autoselect The autoselect mode allows the reading of a binary code from the device and will identify its manufacturer and type. This mode is intended for use by program- ming equipment for the purpose of automatically matching the device to be programmed with its corre- sponding programming algorithm. This mode is func- tional over the entire temperature range of the device. To activate this mode, the programming equipment must force VID (11.5 V to 12.5 V) on address pin A9. Two identifier bytes may then be sequenced from the device outputs by toggling address A0 from VIL to VIH. All addresses are don’t cares except A0, A1, and A6 (see Table 3). The manufacturer and device codes may also be read via the command register, for instances when the Am29F800 is erased or programmed in a system with- out access to high voltage on the A9 pin. The command sequence is illustrated in Table 4 (see Autoselect Com- mand Sequence). Byte 0 (A0 = VIL) represents the manufacturer’s code (AMD=01H) and byte 1 (A0 = VIH) the device identifier code (Am29F800T = D6H and Am29F800B = 58H for x8 mode; Am29F800T = 22D6H and Am29F800B = 2258H for x16 mode). These two bytes/words are given in the table below. All identifiers for manufacturer and device will exhibit odd parity with DQ7 defined as the parity bit. In order to read the proper device codes when executing the Autoselect, A1 must be VIL (see Tables 3 and 4). The autoselect mode also facilitates the determination of sector protection in the system. By performing a read operation at the address location XX02H with the higher order address bits A12–A18 set to the desired sector address, the device will return 01H for a pro- tected sector and 00H for a non-protected sector. Table 3. Am29F800 Sector Protection Verify Autoselect Codes *Outputs 01H at protected sector addresses Table 4. Expanded Autoselect Code Table (B) – Byte mode (W) – Word mode Type A12–A18 A6 A1 A0 Code (HEX) Manufacturer Code—AMD X VIL VIL VIL 01H Am29F800 Device Am29F800T Byte XVIL VIL VIH D6H Word 22D6H Am29F800B Byte XVIL VIL VIH 58H Word 2258H Sector Protection Sector Address VIL VIH VIL 01H* Type Code DQ 15 DQ 14 DQ 13 DQ 12 DQ 11 DQ 10 DQ 9 DQ 8 DQ 7 DQ 6 DQ 5 DQ 4 DQ 3 DQ 2 DQ 1 DQ 0 Manufacturer Code—AMD 01H 000000 0 0 0 0 0 0 0 0 0 1 Am29F800 Device Am29F800T(B) (W) D6H 22D6H A-1 0 HI-Z 0 HI-Z 1 HI-Z 0 HI-Z 0 HI-Z 0 HI-Z 1 HI-Z 0 1 1 1 1 0 0 1 1 0 0 1 1 1 1 0 0 Am29F800B(B) (W) 58H 2258H A-1 0 HI-Z 0 HI-Z 1 HI-Z 0 HI-Z 0 HI-Z 0 HI-Z 1 HI-Z 0 0 0 1 1 0 0 1 1 1 1 0 0 0 0 0 0 Sector Protection 01H 000000 0 0 0 0 0 0 0 0 0 1 |
Podobny numer części - AM29F800B-120FIB |
|
Podobny opis - AM29F800B-120FIB |
|
|
Link URL |
Polityka prywatności |
ALLDATASHEET.PL |
Czy Alldatasheet okazała się pomocna? [ DONATE ] |
O Alldatasheet | Reklama | Kontakt | Polityka prywatności | Linki | Lista producentów 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 |