AM186ES Advanced Micro Devices, AM186ES Datasheet - Page 21

• Manufacturer Part Number: AM186ES
• Description: microcontrollers provide a low-cost/ high-performance solution for embedded system designers who wish to use the x86 architecture.
• Manufacturer: Advanced Micro Devices

chip-select signals is increased to 512 Kbytes to facilitate the use of high-density memory
devices.
Improved memory timing specifications enables the use of no-wait-state memories with
70-ns access times at 40-MHz CPU operation. This reduces overall system cost
significantly by allowing the use of commonly available memory devices.
Figure 1-3 illustrates an Am186ES microcontroller-based SRAM configuration. The
memory interface requires the following:
Read operations require that the RD output connects to the SRAM Output Enable (OE) input
pins. Write operations require that the byte write enables connect to the SRAM Write Enable
(WE) input pins.
The design uses 2-Mbit (256-Kbyte) memory technology to fully populate the available
address space. Two Flash PROM devices provide 512 Kbytes of nonvolatile program
storage, and two static RAM devices provide 512 Kbytes of variable storage area.
The processor A19–A0 bus connects to the memory address inputs.
The AD bus connects directly to the data inputs/outputs.
The chip selects connect to the memory chip-select inputs.
Features and Performance
1-7