AM186ED-20KCSLASHW datasheet(12/88 Pages) AMD

12 / 88 page

Am186ED/EDLV Microcontrollers

PRELI M INARY

F T

COMPARING THE Am186ES/ESLV TO THE Am186ED/EDLV MICROCONTROLLERS

Compared to the Am186ES/ESLV microcontrollers, the

Am186ED/EDLV microcontrollers have the following

additional features:

n Integrated DRAM controller

n Enhanced refresh control unit

n Option to overlap DRAM with peripheral chip select

(PCS)

n Additional serial port mode for DMA support of 9-bit

protocols

n Option to boot from 8- or 16-bit memory

n Improved external bus master support

n PSRAM controller removed

Figure 1 shows an example system using a 40-MHz

Am18 6ED m i cr o c on tr o l le r. F i g u r e 2 sh ow s a

comparable system implementation with an 80C186.

Because of its superior integration, the Am186ED/

EDLV system does not require the support devices that

are required on the 80C186 example system. In

addition, the Am186ED/EDLV microcontrollers provide

significantly better performance with its 40-MHz clock

rate.

Integrated DRAM Controller

The integrated DRAM controller directly interfaces

DRAM to support no-wait state DRAM interface up to

40 MHz. Wait states can be inserted to support slower

DR AM. All signals requir ed by the DR AM ar e

generated on the Am186ED/EDLV microcontrollers

and no external logic is r equired. The DRAM

multiplexed address pins are connected to the odd

address pins starting with A1 on the Am186ED/EDLV

microcontrollers to MA0 on the DRAM. The correct row

and column addresses are generated on these pins

during a DRAM access. The UCAS and LCAS are used

to select which byte of the DRAM is accessed during a

read or write. The RAS0 controls the lower bank of

DRAM which starts at 00000h in the address map and

is bounded by the lower memory size selected in the

LMCS register. RAS1 controls the upper bank of

DRAM which ends at FFFFFh and is bounded by the

upper memory size in the UMCS register. When RAS1

is enabled, UCS is automatically disabled. Neither,

either, or both DRAM banks can be activated.

Figure 2.

80C186 Microcontroller Example System Design

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