Patent ID: 7093041

Claim:
A PCI-X DDR driver for providing internal termination to a transmission line, comprising: a driver control; a plurality of N-channel devices each coupled in series with a discrete resister for providing a desired output impedance, the plurality of N-channel devices being divided into at least two groups; and a plurality of P-channel devices each coupled in series with a discrete resister for providing a desired output impedance, the plurality of P-channel devices being divided into at least two groups, wherein the driver control is suitable for individually controlling selected ones of the groups of N-channel and P-channel devices on or off for providing internal termination to the transmission line, the driver control controlling selected ones of the groups of N-channel and P-channel devices on or off for providing one of pull-up type termination, pull-down type termination, and symmetric type termination to the transmission line.