mcm67t415 1 motorola fast sram advance information 16k x 15 bit cache tag ram for pentium ? processors the mcm67t415 is a 245,760 bit cachetag static ram designed to support pentium microprocessors at bus speeds up to 66 mhz. it is organized as 16k words of 15 bits each and is fabricated using motorola`s high performance, silicon gate bicmos technology. there are twelve common i/o tag bits and three separate i/o status bits. a 12bit comparator is onchip to allow fast comparison of the 12 stored tag bits with the current tag input data. an active high match output is generated when the valid bit is true and these two groups of data are the same for a given address. this highspeed match signal, with t avmv times as fast as 9 ns, provides the fastest possible enabling of secondary cache accesses. the three separate i/o status bits (valid, dirty, and wt) can be configured for either dedicated or generic functionality, depending on the sfunc input pin. with sfunc low, the status bits are defined and used internally by the device, allowing easier determination of the validity and use of the given tag data. sfunc high releases the defined internal status bit usage and control, allowing users to configure the status bit information to fit their system needs. a synchronous reset pin, when held low at a rising clock edge, will reset all status bits in the array for easy invalidation of all tag addresses. the mcm67t415 also provides the option for burst ready (brdy ) generation within the cache tag itself, based upon match, valid bit, wt bit, and other external inputs provided by the user. this can significantly simplify cache controller logic and minimize cache decision time. match and read operations are both asynchronous in order to provide the fastest access times possible, while write operations are synchronous for ease of system timing. the mcm67t415 uses a 5 v power supply on v cc and v ss , with separate v ccq pins provided for the outputs to offer compliance with both 5 v ttl and 3.3 v lvttl logic levels. the pwrdn pin offers a lowpower standby mode, which provides significant system power savings. the mcm67t415 is offered in a space saving 80pin thin quad flat pack (tqfp) package. ? 16k x 15 configuration: 12 tag bits three status bits (valid, dirty, and wt) ? valid bit used to qualify match output ? highspeed addresstomatch comparison times 9/10/12 ns ? brdy circuitry included inside the cachetag for the highest speed operation ? asynchronous read/match operation and synchronous write and reset operation ? separate write enable for tag bits and status bits ? separate output enable for tag bits, status bits, and brdy ? synchronous reset pin for invalidation of all tag entries ? dual chip selects for easy depth expansion with no performance degradation ? i/o pins both 5 v ttl and 3.3 v lvttl compatible with v ccq pins ? pwrdn pin to place device in lowpower mode ? dropin replacement for idt71215 ? packaged in an 80pin thin quad flat pack (tqfp) pentium is a trademark of intel corp. this document contains information on a new product. motorola reserves the right to change or discontinue this product without notice. order this document by mcm67t415/d semiconductor technical data mcm67t415 tq package tqfp case 917a02 9/10/96 ? motorola, inc. 1996
mcm67t415 2 motorola fast sram functional block diagram e1 wt k reset pwrdn tdq0 tdq11 a0 a13 gt reg 0 1 write (pos) pulse generator reg reg reset (neg) pulse generator e2 ws reg 16k x 12 memory tag bits 16k x 3 memory status bits data in register sa sa data in register validd dirtyd validq dirtyq gs compare sfunc w/r brdyh brdyd brdyg match brdy wtd wtq
mcm67t415 3 motorola fast sram pin assignments 51 52 49 50 46 47 48 44 45 41 42 43 27 28 24 25 26 32 33 29 30 31 35 36 34 21 22 23 54 55 56 57 58 59 60 40 39 38 37 v ss tdq6 tdq7 validq v ss brdy match v cc v ss wtd a0 a1 a2 a3 a4 a5 validd reset pwrdn k e1 tdq10 brdyg tdq11 brdyd sfunc a10 a9 a13 a11 a8 brdyh a12 tdq5 wtq nc v ccq v ss v ss a6 v ss 53 74 73 77 76 75 69 68 72 71 70 66 65 67 80 79 78 61 62 63 64 10 9 12 11 15 14 13 17 16 20 19 18 7 6 5 4 3 2 1 8 tdq9 gt e2 wt ws v ss v cc gs tdq4 a7 tdq2 tdq3 tdq0 tdq1 dirtyq v cc v ss v ss v ccq v ss v ss v ss v ss dirtyd v ss v ss v ss v ss v cc v ss v ccq v ss v ss tdq8 v ccq v ss v ss w/r v ss motorola reserves the right to make changes without further notice to any products herein. motorola makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. atypicalo parameters which may be provided in motorola data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. all operating parameters, including atypicalso must be validated for each customer application by customer's technical experts. motorola does not convey any license under its patent rights nor the rights of others. motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the motorola product could create a situation where personal injury or death may occur. should buyer purchase or use motorola products for any such unintended or unauthorized application, buyer shall indemnify and hold motorola and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that motorola was negligent regarding the design or manufacture of the part. motorola and are registered trademarks of motorola, inc. motorola, inc. is an equal opportunity/affirmative action employer. how to reach us: usa / europe / locations not listed : motorola literature distribution; japan : nippon motorola ltd.; tatsumispdjldc, 6f seibubutsuryucenter, p.o. box 20912; phoenix, arizona 85036. 18004412447 or 6023035454 3142 tatsumi kotoku, tokyo 135, japan. 038135218315 mfax : rmfax0@email.sps.mot.com touchtone 6 022446609 asia / pacific : motorola semiconductors h.k. ltd.; 8b tai ping industrial park, internet : http://designnet.com 51 ting kok r oad, tai po, n.t., hong kong. 85226629298 mcm67t415/d
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