Configuring Cisco SFP to speed cap at 100Mbps

I have a Cisco 2940 switch with 1000Base-SX SFP.  I want this fiber port to communicate at 100Mbps not 1000.  This is becuase we have touchy network equipment that needs to have 100mbps and not 1000.  How would I go about doing this?  When I type the following:

config t
int gi0/1

when I type "speed ?" there is not a speed option.  Is it possible for me to throddle this back?  I use a GLC-SX-MM sfp.  The swtich is a cisco catalyst 2940 series switch.

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yeah SFPs do not give you an option to run at 100Mbps just 1000Mbps.

If the equipment needs to have a connection speed of 100Mbps then you are not going to be able to use these ports.

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