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This paper addresses the design of trTCM (Two Rate Three Color Marker) described in RFC2698. RFC2698 has proposed trTCM to be used at the ingress of Differentiated Service network that provides AF PHB (Assured Forwarding Per Hop Behavior). trTCM is the marker with the metering function, and consists of the token updating function and the marking function. The token updating function uses the dual token bucket. Token update rate for two buckets is decided by CIR (Committed Information Rate) and PIR (Peak Information Rate) respectively. The marking function compares the token values with the length of input packet, and then marks the result into IP QoS field (ToS or DSCP). This paper designs trTCM function for implementing its function using VHDL and FPGA technology.