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AM41PDS3224DB70IS 数据表(PDF) 3 Page - Advanced Micro Devices |
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AM41PDS3224DB70IS 数据表(HTML) 3 Page - Advanced Micro Devices |
3 / 59 page 2 Am41PDS3224D May 13, 2002 P R E L IMINARY GENERAL DESCRIPTION The Am29PDS322D is a 32 Mbit, 1.8 V-only Flash memory organized as 2,097,152 words of 16 bits each. The device is designed to be programmed in system with standard system 1.8 V V CC supply. This d ev ic e ca n a ls o be re pr og ra mm ed in s tand ar d EPROM programmers. The Am29PDS322D offers fast page access time of 40 ns with random access time of 100 ns (at 1.8 V to 2.2 V V CC), allowing operation of high-speed micropro- cessors without wait states. To eliminate bus conten- tion the device has separate chip enable (CE), write enable (WE), and output enable (OE) controls. The page size is 4 words. The device requires only a single 1.8 volt power sup- ply for both read and write functions. Internally generated and regulated voltages are provided for the program and erase operations. Simultaneous Read/Write Operations with Zero Latency The Simultaneous Read/Write architecture provides simultaneous operation by dividing the memory space into two banks. The device can improve overall system performance by allowing a host system to pro- gram or erase in one bank, then immediately and si- multaneously read from the other bank, with zero latency. This releases the system from waiting for the completion of program or erase operations. The device is divided as shown in the following table: Am29PDS322D Features The SecSi (Secured Silicon) Sector is an extra 64 KByte sector capable of being permanently locked by AMD or customers. The SecSi Indicator Bit (DQ7) is permanently set to a 1 if the part is factory locked, and set to a 0 if customer lockable. This way, cus- tomer lockable parts can never be used to replace a factory locked part. Factory locked parts provide several options. The SecSi Sector may store a secure, random 16 byte ESN (Electronic Serial Number), customer code (pro- grammed through AMD’s ExpressFlash service), or both. Customer Lockable parts may utilize the SecSi Sector as bonus space, reading and writing like any other flash sector, or may permanently lock their own code there. DMS (Data Management Software) allows systems to easily take advantage of the advanced architecture of the simultaneous read/write product line by allowing removal of EEPROM devices. DMS will also allow the system software to be simplified, as it will perform all functions necessary to modify data in file structures, as opposed to single-byte modifications. To write or update a particular piece of data (a phone number or configuration data, for example), the user only needs to state which piece of data is to be updated, and where the updated data is located in the system. This i s a n adv antage c o mpa r ed to s y s t em s whe r e user-written software must keep track of the old data location, status, logical to physical translation of the data onto the Flash memory device (or memory de- vices), and more. Using DMS, user-written software does not need to interface with the Flash memory di- rectly. Instead, the user's software accesses the Flash memory by calling one of only six functions. AMD pro- vides this software to simplify system design and soft- ware integration efforts. The device offers complete compatibility with the JEDEC single-power-supply Flash command set standard. Commands are written to the command register using standard microprocessor write timings. Reading data out of the device is similar to reading from other Flash or EPROM devices. The host system can detect whether a program or erase operation is complete by using the device sta- tus bits: RY/BY# pin, DQ7 (Data# Polling) and DQ6/DQ2 (toggle bits). After a program or erase cycle has been completed, the device automatically returns to the read mode. The sector erase architecture allows memory sec- tors to be erased and reprogrammed without affecting the data contents of other sectors. The device is fully erased when shipped from the factory. Hardware data protection measures include a low V CC detector that automatically inhibits write opera- tions during power transitions. The hardware sector protection feature disables both program and erase operations in any combination of the sectors of mem- ory. This can be achieved in-system or via program- ming equipment. The device offers two power-saving features. When addresses have been stable for a specified amount of time, the device enters the automatic sleep mode. Th e s ys tem can al so plac e the de vi ce into the standby mode. Power consumption is greatly re- duced in both modes. Bank 1 Sectors Bank 2 Sectors Quantity Size Quantity Size 8 4 Kwords 56 32 Kwords 7 32 Kwords 4 Mbits total 28 Mbits total |
类似零件编号 - AM41PDS3224DB70IS |
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类似说明 - AM41PDS3224DB70IS |
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