From: schellew@wu2.wl.aecl.ca (Wayne Schellekens)
Subject: WANTED: DRAM Controller for use with MC68HC16
Keywords: DRAM, HC16
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Organization: AECL Research, Whiteshell Laboratories
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For an upcoming project I want to use 4 Megs of DRAM configured as two 2
Meg banks of 16 bit data.  I was wondering if anyone out there knows of a
DRAM controller which will handle refreshing the data.  It's ok if the
controller doesn't handle bank switching - that part is easy.

The only controllers I know of are the ones out of the National
Semiconductor DRAM Management Handbook (1988 edition) eg. DP8429.  I would
like to know if another manufacturer produces one which may be easier to
implement in my circuit.

BTW, if anyone is wanting to hook up DRAM to a microcontroller, Dallas
Semiconductor makes a neat chip: the DS1262 Serial DRAM Nonvolatizer
Chip.  It uses the SPI (I2C) bus and refreshes/controls up to 16Mx1 of DRAM
memory.  It can use an external battery to refresh the DRAM when the
power is off.  Price is $11.75 from Dallas (quan 1).  I wish I could use
this chip but its maximum SPI clock rate is 1 MHz (too slow for me...).

Thanks in advance,

Wayne Schellekens
<schellew@wu2.wl.aecl.ca>
-- 
Wayne Schellekens, VE4WTS          Internet: schellew@wu2.wl.aecl.ca
AECL Research                         AX.25: VE4WTS@VE4KV.#WPG.MB.CAN 
Whiteshell Laboratories        Twisted pair: (204)753-2311 x2317