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AM29F040-150PC Folha de dados(PDF) 7 Page - Advanced Micro Devices |
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AM29F040-150PC Folha de dados(HTML) 7 Page - Advanced Micro Devices |
7 / 33 page Am29F040 7 Table 1. Am29F040 User Bus Operations Legend: L = Logic 0, H = Logic 1, X = Don’t Care. See DC Characteristics for voltage levels. Notes: 1. Manufacturer and device codes may also be accessed via a command register write sequence. Refer to Tables 2 and 4. 2. Refer to Table 3 for valid PD (Program Data) during a write operation. 3. Refer to the section on Sector Protection. 4. WE can be VIL if OE is VIL, OE at VIH initiates the write operations. Read Mode The Am29F040 has two control functions which must be satisfied in order to obtain data at the outputs. CE is the power control and should be used for device selec- tion. OE is the output control and should be used to gate data to the output pins if a device is selected. Address access time (tACC) is equal to the delay from stable addresses to valid output data. The chip enable access time (tCE) is the delay from stable addresses and stable CE to valid data at the output pins. The output en- able access time is the delay from the falling edge of OE to valid data at the output pins (assuming the addresses have been stable for at least tACC–tOE time). Standby Mode The Am29F040 has two standby modes, a CMOS standby mode (CE input held at VCC ± 0.5 V), when the current consumed is less than 5 µA; and a TTL standby mode (CE is held at VIH) when the current required is reduced to approximately 1 mA. In the standby mode the outputs are in a high impedance state, independent of the OE input. If the device is deselected during erasure or program- ming, the device will draw active current until the operation is completed. 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 out of a binary code from the device and will identify its manufacturer and type. This mode is intended for use by programming equipment for the purpose of automatically matching the device to be programmed with its corresponding pro- gramming algorithm. This mode is functional 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. The manufacturer and device codes may also be read via the command register, for instances when the Am29F040 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 (refer to Autoselect Command section). Byte 0 (A0 = VIL) represents the manufacturer’s code (AMD = 01H) and byte 1 (A0 = VIH) the device identifier code (Am29F040 = A4H). All identifiers for manufac- turer and device exhibit odd parity with the MSB (DQ7) defined as the parity bit. See Table 2. Operation CE OE WE A0 A1 A6 A9 I/O Autoselect Manufacturer Code (Note 1) L L H L L L VID Code Autoselect Device Code (Note 1) L L H H L L VID Code Read (Note 4) L L H A0 A1 A6 A9 RD Standby H XXXXXX HIGH Z Output Disable L H H XXXX HIGH Z Write L H L A0 A1 A6 A9 PD (Note 2) Verify Sector Protect (Note 3) L LHLHL VID Code Autoselect Device Unprotect Code L L H H H L VID Code |
Nº de peça semelhante - AM29F040-150PC |
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Descrição semelhante - AM29F040-150PC |
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