Low-noise embedded CAM with reduced slew-rate match-lines and asynchronous search-lines

An embedded content addressable memory (eCAM) uses reduced slew-rate match-line sensing and asynchronous search-line switching to decrease power supply noise while achieving high search speed and low power. When compared to a previous state-of-the-art eCAM, the new design reduces 44% of peak power-supply noise while performing 352M searches/second and consuming 260mW. This reduction in noise directly reduces the amount of decoupling capacitance and, with it, overall chip area. This paper also presents built-in self test patterns for testing search margin and susceptibility to power supply noise. The low-noise eCAM macro has been implemented in 90nm 1.2V CMOS process and is fully functional over a voltage range of 0.7V - 2.05V.