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<== Date ==> <== Thread ==>

Subject: 80 MHz version of uCDIMM ColdFire 5282
From: Eric Norum <[email protected]>
To: "K.M Ha" <[email protected]>
Cc: [email protected]
Date: Mon, 9 Jun 2008 09:38:52 -0500
I have a question to those using the 80 MHz version of the ColdFire uCDIMM 5282. How do you connect this to external logic such as an FPGA? Here's the bus timing section of the data sheet:

Attachment: pastedGraphic.pdf
Description: Adobe PDF document



This implies that external logic must assert TA within 2.5 ns (Time B0 minus time B1a) of the rising edge of CLKOUT. WIth the 64 MHz part this requirement was 5.625 ns, which wasn't easy to reach, but was possible.
Do you do some tricky stuff like use the falling edge of CLKOUT to clock the section of the FPGA that drives the ColdFire TA* pin?


--
Eric Norum <[email protected]>
Advanced Photon Source
Argonne National Laboratory
(630) 252-4793



Replies:
RE: 80 MHz version of uCDIMM ColdFire 5282 K.M Ha
References:
uC5282 based RTEMS FlashSize error K.M Ha

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