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Re: Problems with i21154 bridge

Isn't there some sort of errata about needing to force the secondary bus
clock toggling at power-on in order to get the secondary clock outputs to
be enabled?  It sounds related to your problem.

On Mon, 15 Jan 2001, Jose Franciso Toledo Alarcon wrote:

> Hello,
> Let me describe briefly my problem and hope there's somebody out there
> who can give me some hints:
> ------------------------------------------------------------------------
> Situation: Custom design with two i21154 PCI bridges (33-MHz version) in
> the primary bus. Two PCI FPGAs (Lucent OR3LP26B) under each bridge. No PCI
> Host in the primary bus yet, but a a PCI analyzer (Catalyst) is used for
> bus scan instead.
> Conditions (i21154 pins): P_M66ENA, S_M66ENA, CONFIG66, BPCCE, MSK_IN,
> S_CFGN tied low. GPIOs pulled high. TRST (JTAG) tied low. Primary PCI
> reset exceeds data sheet requirements. 15-MHz clock. Signaling enviroment
> is 3.3V.
> Problem: PCI bridges are not found during primary PCI bus scan. PCI
> bridges do not generate clock on its secundary bus outputs ('1' in all
> clock outputs) and secondary buses' reset is hold low by the bridges
> permanently.
> Several PCI cards plugged in a test slot in the primary bus are found
> during bus scan and R/W configuration operations to its registers are
> carried out successfully.
> --------------------------------------------------------------------------
> Thank you for your time and for your help,
> ======================oo=======================
> Jose Toledo
> European Organization for Nuclear Research - CERN
> Geneve, 23
> CH-1211 (Switzerland)
> EP division -- Electronic Design group (ED)
> FAX: +41 22 767 9355
> TEL: +41 22 767 8596
> ======================oo======================= 

-- Neal Palmer

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