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AM29F040B-55FC Fiches technique(PDF) 7 Page - Advanced Micro Devices |
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AM29F040B-55FC Fiches technique(HTML) 7 Page - Advanced Micro Devices |
7 / 30 page Am29F040B 7 P R E L I M I NARY The device enters the CMOS standby mode when the CE# pin is held at VCC ± 0.5 V. (Note that this is a more restricted voltage range than VIH.) The device enters the TTL standby mode when CE# is held at VIH. The device requires the standard access time (tCE) before it is ready to read data. If the device is deselected during erasure or program- ming, the device draws active current until the operation is completed. ICC3 in the DC Characteristics tables represents the standby current specification. Output Disable Mode When the OE# input is at VIH, output from the device is disabled. The output pins are placed in the high imped- ance state. Table 2. Sector Addresses Table Note: All sectors are 64 Kbytes in size. Autoselect Mode The autoselect mode provides manufacturer and de- vice identification, and sector protection verification, through identifier codes output on DQ7–DQ0. This mode is primarily intended for programming equipment to automatically match a device to be programmed with its corresponding programming algorithm. However, the autoselect codes can also be accessed in-system through the command register. When using programming equipment, the autoselect mode requires VID (11.5 V to 12.5 V) on address pin A9. Address pins A6, A1, and A0 must be as shown in Autoselect Codes (High Voltage Method) table. In addi- tion, when verifying sector protection, the sector ad- dress must appear on the appropriate highest order address bits. Refer to the corresponding Sector Ad- dress Tables. The Command Definitions table shows the remaining address bits that are don’t care. When all necessary bits have been set as required, the program- ming equipment may then read the corresponding identifier code on DQ7–DQ0. To access the autoselect codes in-system, the host system can issue the autoselect command via the command register, as shown in the Command Defini- tions table. This method does not require VID. See “Command Definitions” for details on using the autose- lect mode. Sector A18 A17 A16 Address Range SA0 0 0 0 00000h–0FFFFh SA1 0 0 1 10000h–1FFFFh SA2 0 1 0 20000h–2FFFFh SA3 0 1 1 30000h–3FFFFh SA4 1 0 0 40000h–4FFFFh SA5 1 0 1 50000h–5FFFFh SA6 1 1 0 60000h–6FFFFh SA7 1 1 1 70000h–7FFFFh |
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