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PM29F002T-70PC Datasheet(PDF) 5 Page - PMC-Sierra, Inc |
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PM29F002T-70PC Datasheet(HTML) 5 Page - PMC-Sierra, Inc |
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5 / 21 page  Programmable Microelectronics Corp. Issue Date: March, 2001 Rev: 1.0 PMC Pm29F002 BLOCK DIAGRAM DEVICE OPERATION READ OPERATION The access of Pm29F002 is similar as that of EPROM. To obtain data at the outputs, three control functions must be satisfied: • CE# is the chip enable and should be pulled low ( VIL ). • OE# is the output enable and should be pulled low ( VIL). • WE# is the write enable and should remains high ( VIH ). BOOT BLOCK LOCKOUT The device has a software lockout feature to pre- vent the data in the boot block from being erased or reprogrammed. The boot block can be located at the top or bottom of the address location. The block size is 16 Kbytes. Once the lockout feature is enable, the boot block can not be erased or reprogrammed. Data in the main memory block can still be updated through the regular programming method. The boot block lockout feature can be turned on by issuing a six-bus-cycle com- mand sequence. Please refer to Table 4 and Chart 4. BOOT BLOCK LOCKOUT DETECTION The state of the Boot Block lockout can be de- tected by software product identification entry. After entry, selects Boot Block address with A0 = “0” and A1 = “1” and then read I/O0. A data of “0” means the lock- out feature is disabled and the Boot Block can be erased or programmed. A data of “1” means the lockout fea- ture is enabled and the Boot Block is protected. Prod- uct identification exit must be executed before the de- vice returns to read mode. PRODUCT IDENTIFICATION The product identification mode can be used to identify the device and the manufacturer by hardware or soft- ware operation. The hardware operation mode is acti- vated by applying a 12.0 Volt on A9 pin, typically used by an external programmer to select the right program- ming algorithm for the device. For detail, please see Bus Operation Modes in Table 3. The software opera- tion mode is activated by three-bus-cycle command. Please see Software Command Definition in Table 4. 5 WE# CE# OE# COMMAND REGISTER CE,OE LOGIC A0-A17 ERASE/PROGRAM VOLTAGE GENERATOR HIGH VOLTAGE SWITCH I/O0-I/O7 I/O BUFFERS DATA LATCH SENSE AMP Y-GATING MEMORY ARRAY Y-DECODER X-DECODER |
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