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NG80386SXL-33 Datasheet(PDF) 3 Page - Advanced Micro Devices |
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NG80386SXL-33 Datasheet(HTML) 3 Page - Advanced Micro Devices |
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3 / 30 page  FINAL Am386SX/SXL/SXLV Microprocessors Data Sheet 3 BLOCK DIAGRAM FUNCTIONAL DESCRIPTION True Static Operation (Am386SXL/SXLV Only) The Am386SXL/SXLV microprocessor incorporates a true static design. Unlike dynamic circuit design, the Am386SXL/SXLV device eliminates the minimum op- erating frequency restriction. It may be clocked from its maximum speed all the way down to 0 MHz (DC). Sys- tem designers can use this feature to design portable applications with long battery life. Standby Mode (Am386SXL/SXLV Only) The true static design of the Am386SXL/SXLV micro- processor allows for a Standby Mode. At any operating speed, the microprocessor will retain its state (i.e., the contents of all its registers). By shutting off the clock completely, the device enters Standby Mode. Since power consumption is proportional to clock frequency, operating power consumption is reduced as the fre- quency is lowered. In Standby Mode, typical current draw is reduced to less than 20 microamps at DC. Not only does this feature save battery life, but it also sim- plifies the design of power-conscious portable applica- tions in the following ways. s Eliminates the need for software in BIOS to save and restore the contents of registers. s Allows simpler circuitry to control stopping of the clock since the system does not need to know the state of the processor. Lower Operating Icc (Am386SXL/SXLV Only) True static design also allows lower operating Icc when operating at any speed. Performance on Demand (Am386SXL/SXLV Only) The Am386SXL/SXLV microprocessor retains its state at any speed from 0 MHz (DC) to its maximum operat- ing speed. With this feature, system designers may vary the operating speed of the system to extend the battery life in portable systems. Pipeline/ Bus Size Control Effective Address Bus Effective Address Bus Dedicated ALU Bus Barrel Shifter, Adder Multiply/ Divide Register File Decode and Sequencing Control ROM Instruction Decoder 3-Decoded Instruction Queue Prefetcher/ Limit Checker Limit and Attribute PLA Descriptor Registers 3-Input Adder Page Cache Adder Request Prioritizer Address Driver Protection Test Unit ALU Control ALU Control Instruction Instruction Code Stream 32 32 32 25 32 Segmentation Unit Paging Unit Bus Control HOLD, INTR, NMI, ERROR, BUSY, RESET, HLDA, FLT, SMI*, IIBEN* BHE, BLE, A23-A1 M/IO, D/C, W/R, LOCK, ADS, NA, READY, SMIADS*, SMIRDY* D15-D0 * – On Am386SXLV only 32 Bit Control Attribute PLA and Prefetch Predecode MUX/ Trans- ceivers Status Flags 16-Byte Code Queue Internal Control Bus 32 |
Similar Part No. - NG80386SXL-33 |
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Similar Description - NG80386SXL-33 |
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