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AM49DL320BGB851 데이터시트(PDF) 3 Page - SPANSION |
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3 / 64 page 2 Am49DL320BG June 25, 2002 P R E L I M I NARY GENERAL DESCRIPTION Am29DL320G Features The Am29DL320G consists of 32 megabit, 3.0 volt-only flash memory devices, organized as 2,097,152 words of 16 bits each or 4,194,304 bytes of 8 bits each. Word mode data ap- pea rs on DQ15 – DQ0; by te mod e d a ta app ear s o n DQ7–DQ0. The device is designed to be programmed in-system with the standard 3.0 volt V CC supply, and can also be programmed in standard EPROM programmers. The devices are available with access times of 70 and 85 ns. The device is offered in a 73-ball FBGA package. Standard control pins—chip enable (CE#f), write enable (WE#), and output enable (OE#)—control normal read and write opera- tions, and avoid bus contention issues. The devices requires only a single 3.0 volt power supply 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 simul- taneous operation by dividing the memory space into four banks, two 4 Mb banks with small and large sectors, and two 12 Mb banks of large sectors. Sector addresses are fixed, system software can be used to form user-defined bank groups. During an Erase/Program operation, any of the three non-busy banks may be read from. Note that only two banks can operate simultaneously. The device allows a host sys- tem to program or erase in one bank, then immediately and simultaneously read from the other bank, with zero latency. This releases the system from waiting for the completion of program or erase operations. The Am29DL320G can be organized as either a top or bot- tom boot sector configuration. Am49DL320BG Features The SecSiTM (Secured Silicon) Sector is an 256 byte extra sector capable of being permanently locked by AMD or cus- tomers. The SecSi Indicator Bit (DQ7) is permanently set to a 1 if the part is factory locked, and set to a 0 if cus- tomer lockable. This way, customer lockable parts can never be used to replace a factory locked part. Note that some previous AMD 32 Mbit Am29DL32x devices had a larger SecSi Sector. 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. DMS (Data Management Software) allows systems to eas- ily 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 is an advantage compared to systems where user-written soft- ware must keep track of the old data location, status, logical to physical translation of the data onto the Flash memory de- vice (or memory devic es), and mor e . U s ing DMS, user-written software does not need to interface with the Flash memory directly. Instead, the user's software ac- c esses th e Flash memo ry by callin g one o f only six functions. AMD provides this software to simplify system de- sign and software 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 stan- dard 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 op- eration is complete by using the device status bits: RY/BY# pin, DQ7 (Data# Polling) and DQ6/DQ2 (toggle bits). After a program or erase cycle has been completed, the device au- tomatically returns to reading array data. The sector erase architecture allows memory sectors to be erased and reprogrammed without affecting the data con- tents of other sectors. The device is fully erased when shipped from the factory. Hardware data protection measures include a low V CC de- tector that automatically inhibits write operations during power transitions. The hardware sector protection feature disables both program and erase operations in any combi- nation of the sectors of memory. This can be achieved in-system or via programming equipment. The device offers two power-saving features. When ad- dresses have been stable for a specified amount of time, the device enters the automatic sleep mode. The system can also place the device into the standby mode. Power con- sumption is greatly reduced in both modes. Bank Megabits Sector Sizes Bank 1 4 Mb Eight 8 Kbyte/4 Kword, Seven 64 Kbyte/32 Kword Bank 2 12 Mb Twenty-four 64 Kbyte/32 Kword Bank 3 12 Mb Twenty-four 64 Kbyte/32 Kword Bank 4 4 Mb Eight 64 Kbyte/32 Kword |
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