1MB R4000 Secondary Cache Fast Static RAM Module Set
Description
MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Order this document by MCM4464/D
MCM4464 Series 1MB R4000 Secondary Cache Fast Static RAM Module Set
Four MCM4464 modules comprise a full 1 MB of secondary cache for the R4000 processor.
Each module contains nine MCM6709J fast static RAMs for a cache data size of 64K x 36.
The tag portion, dependent on word line size, contains either two MCM6709J or one MCM6706J fast static RAMs.
All input signals, except A0 and WE are buffered using 74FBT2827 drivers with series 25 Ω resistors.
The MCM6709J and MCM6706J are fabricated using high–performance silicon–gate BiCMOS technology.
Static design eliminates the need for internal clocks or timing strobes.
All 1MB R4000 supported secondary cache options are available.
• • • • • • • • • • Single 5 V ± 10% Power Supply All Inputs and Outputs are TTL Compatible Three State Outputs Fast Module Access Time: 12/15/17 ns Zero Wait–State Operation Unified or Split Seconday Cache Modules are Available (See Ordering Information for Details) Word Line Sizes of 4, 8, 16, and 32 are Available (See Ordering Information for Details) The Pin Compatible MCM44256 Series is also Available to Support a Full 4MB R4000 Secondary Cache.
Decoupling Capacitors are Used for Each Fast Static RAM and Buffer, Along with Bulk Capacitance for Maximum Noise Immunity High Quality Multi–Layer FR4 PWB with Separate Power and Ground Planes PIN ASSIGNMENT 80 LEAD SIMM — TOP VIEW
VCC DQ1 DQ3 DQ5 VSS DQ8 DQ10 DQ12 DQ14 DQ15 DQ17 DQ19 DQ21 VSS DQ23 DQ25 DQ27 DQ29 DQ30 DQ32 DQ34 VSS A0 A2 A4 A6 VCC OE A8 A10 VSS A13 A15 NC TDQ0 TDQ1 TDQ3 TDQ5 TDQ7 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66* 68* 70 72 74 76 78 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 51 53 55 57 59 61 63 65 67 69 71 73 75 77 79 VSS DQ0 DQ2 DQ4 DQ6 DQ7 DQ9 DQ11 DQ13 VSS DQ16 DQ18 DQ20 DQ22 VCC DQ24 DQ26 DQ28 VSS DQ31 DQ33 DQ35 WE A1 A3 A5 VSS DCS A7 A9 A11 A12 A14 NC TCS VSS TDQ2 TDQ...
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