1/8 february 2002 AN1372 application note how to use m58lw032a as replacement for 28f320j3a in an asynchronous environment contents n introduction n electronic signature (m58lw032a) n power supply n packages and pinout/ ballout comparison n block organization n command set and software compatibility n summary of characteristics and performances introduction this application note is preliminary information regarding a flash memory currently being developed by stmicroelectron- ics. it describes how to use the m58lw032a as a replacement for the 28f320j3a strataflash memory. the m58lw032a is a 32mbit flash memory from stmicroelec- tronics. the device is 2mbit x16 and features page mode to speed up read operations and a write buffer to reduce pro- gramming times. the m58lw032a is a new device in the 0.15 process technology. refer to the m58lw32a datasheet for fur- ther information. electronic signature (m58lw032a) C manufacturer code: 0020h C device code m58lw032a : 8816h power supply m58lw032a: Cv dd = 2.7v to 3.6v , core power supply Cv ddq =1.8vtov dd, input and output buffer power supply Cv pp = 2.7v to 3.6v = program/erase voltage, used to protect blocks during program/erase operations please refer to table 2 for a summary of characteristics.
AN1372 - application note 2/8 packages and pinout/ballout comparison the m58lw032a is offered in tsop56 and tbga64 packages. figure 1 shows the tsop56 pin comparison of the two devices. figures 2 and 3 show a comparison of the tbga64 ball out for the two devices. table 1 gives a description of how the pins of m58lw032a must be connected when it is used in asynchronous mode. figure 1. tsop56 (14 x 20mm) comparison dq3 dq9 dq2 dq0 dq6 a16 a17 a18 dq14 dq12 dq10 rb v ddq dq4 dq7 ai04514b m58lw032a 14 1 15 28 29 42 43 56 dq8 v dd dq1 dq11 nc a20 a21 nc a19 w nc r e l k a6 a3 a8 a9 a10 a2 a7 v pp a1 a4 a5 a12 a13 a11 a15 a14 rp v ss nc dq13 dq15 v dd dq5 g v ssq v ssq a16 a17 a18 v cc a20 a21 a19 nc ce1 ce0 a6 a3 a8 a9 a10 a2 a7 v pen a1 a4 a5 a12 a13 a11 a15 a14 rp gnd 28f320j3a 28f320j3a dq3 dq9 dq2 dq0 dq6 dq14 dq12 dq10 sts v ccq dq4 dq7 dq8 dq1 dq11 a0 nc we ce2 byte nc dq13 dq15 v cc dq5 oe gnd gnd different functionality same functionality but different name
3/8 AN1372 - application note figure 2. m58lw032a tbga64 connections (top view through package) ai04515 dq6 a1 v ss v dd dq10 v dd dq7 dq5 v ddq dq2 du h dq14 v ssq dq13 d a16 a20 e a9 c a17 a21 a11 a15 k a8 b r a19 a2 a13 a14 a 8 7 6 5 4 3 2 1 a7 a3 a4 a5 g f e dq0 l a6 v pp du a18 a10 a12 rp dq15 rb dq9 dq8 dq1 dq4 dq3 g dq12 dq11 w v ss du du du du du du du du du du
AN1372 - application note 4/8 figure 3. 28f320j3a connections (top view through package) ai04516 dq6 a1 gnd v cc dq10 v cc dq7 dq5 v ccq dq2 a0 h dq14 gnd dq13 d a16 a20 ce0 a9 c a17 a21 a11 a15 byte a8 b ce1 a19 a2 a13 a14 a 8 7 6 5 4 3 2 1 a7 a3 a4 a5 g f e dq0 ce2 a6 v pen nc a18 a10 a12 rp dq15 sts dq9 dq8 dq1 dq4 dq3 ce dq12 dq11 we gnd nc nc nc nc nc nc nc nc nc nc
5/8 AN1372 - application note table 1. pin connections block organization the m58lw032a has 64 uniform blocks of 32kwords (512kbit) each. the m58lw032a device has a 128 bit security register used for security purposes. it is divided into two 64 bit parts, one written in the factory by the manufacturer and the other programmable by the user. the user programmable part can be locked. package m58lw032a 28f320j3a comments tsop56 tbga64 pin 2 ball b8 r ce1 r is an open drain output pin in synchronous burst mode, during asynchronous mode it is high impedance. ce1 is a chip enable input. the pin can be grounded. pin 29 ball h1 l ce2 l is the latch enable used to latch the address for multiplexed addresses in data bus systems. ce2 is a chip enable input. the pin can be grounded for successful operation of both memories in the same socket. pin 31 ball f1 k byte the burst clock , k, is used to perform synchronous burst operations. byte selects x8 or x16 mode. the pin should be set high for correct operation of both memories in the same socket. pin 32 ball g2 nc a0 address input a0 is not used when 28f320j3a is in x16 mode. nc not connected. the pin can be set low or high. pin 53 ball e8 rb (5) sts rb ready/busy open drain output. sts configuration status pin. after power-up or reset on the 28f320j3a the sts pin is configured to function the same as the rb pin, therefore both pins will behave the same unless the configuration of the 28f320j3a is changed.
AN1372 - application note 6/8 command set and software compatibility this section highlights the command set differences between the two devices m58lw032a and 28f320j3a and shows the aspects that must be taken into account when writing software to manage the different devices. recovery from reset for read operations 28f320j3a offers a recovery time (rp high to output valid) of 150ns, while a delay of 1s (after the rising edge of rp ) is required before the device is ready for program or erase operations. for read operations m58lw032a offers a recovery time (rp high to output valid) of 150ns. the device will be ready for program or erase operations 150ns after the rising edge of rp . read the m58lw032a offers an asynchronous access time of 90ns, an da4wordasynchr onous page mode feature with 90/25ns access time. refer to table 2 for a summary of the characteristics. write to speed up write operations the m58lw032a features a 16 word write buffer. the write buffer feature is especially useful to free the microprocessor to perform other work during the program execution. the information about the write buffer size is part of the common flash interface so it is possible to manage this information automatically. the m58lw032a offers a word program command and a write to buffer command. please refer to table 2 for a summary of write characteristics. erase the different block organizations must be taken into account. please refer to table 2 for erase perfor- mances. security features both m58lw032a and 28f320j3a have commands to manage the protection register. 28f320j3a offers a command to configure sts pin.
7/8 AN1372 - application note summary of characteristics and performances table 2 gives a summary of all the important characteristics and performances of the two devices. table 2. device characteristics and performances summary note: 1. v pp and v pen refer to program/erase voltage, used to protect blocks during program/erase operations. revision history parameter m58lw032a 28f320j3a power supply v dd = 2.7v to 3.6v v ddq = 1.8v to v dd v cc core = 2.7v to 3.6v v cc i/o = 2.7v to v cc core program/erase voltages v pp = 2.7v to 3.6v (1) v pen = 2.7v to 3.6v (1) bus width x16 x8/x16 block organization 64 blocks 32kword 32 blocks 64kword random access time 90ns 110ns page mode size 4 words 4 words page mode access time 90ns/25ns 110ns/25ns write buffer size 16 words 16 words program time using write buffer 290s/16 words 218s/16 words word program time 18s 210s block erase time 1.1s 1s maximum number of program/erase cycles 100,000 100,000 date version revision details 08-jun- 2001 -01 first issue 28-feb- 2002 -02 m58lsw32 device removed from document, random access time and program and erase times modified, pin connections clarified.
AN1372 - application note 8/8 if you have any questions or suggestion concerning the matters raised in this document please send them to the following electronic mail address: ask.memory@st.com (for general enquiries) please remember to include your name, company, location, telephone number and fax number. information furnished is believed to be accurate and reliable. however, stmicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of stmicroelectronics. specifications mentioned in this publication are subject to change without notice. this publication supersedes and replaces all information previously supplied. stmicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of stmicroelectronics. the st logo is registered trademark of stmicroelectronics all other names are the property of their respective owners ? 2002 stmicroelectronics - all rights reserved stmicroelectronics group of companies australia - brazil - canada - china - finland - france - germany - hong kong - india - israel - italy - japan - malaysia - malta - morocco - singapore - spain - sweden - switzerland - united kingdom - united states www.st.com
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