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This paper describes a 32x32b 4R/2W (4 read ports and 2 write ports) register file for low power operation in 65 nm CMOS. A new separated read port with four transistors is proposed to reduce the bit line leakage during read mode. Compared to previous IP3N read port design, it has smaller area and better performance with almost no penalty in leakage current. In addition, two extra transistors are added to cut off the feedback between the two inverters during write mode. This results in an obvious improvement in write noise margin. Moreover, the cell array is divided into two banks with each bank 16 words. In this way, the capacity on the local read bit line is reduced to 50% of that not banked, which reduces power consumption further. According to the post-layout simulation results, the read latency is 506ps and 60.8ns at 1.2V and OAV respectively.

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Exploring the effects of urbanization on the conservation status of geomantic forest containing rare and endangered plants is very important for the ecological development of southern China. We studied the community structure and habitat characteristics of geomantic forest in Guangzhou City, southern China, as well as the population characteristics of the rare and endangered plant Aquilaria sinensis that resides there. The results showed that, within geomantic forest, there were 23 species vascular plants belonging to 23 genera and 14 families. This community was dominated by tropical and subtropical species. This community was mainly composed with mesophanerophytes, miphanerophytes and mesophyll. The community was less diverse than natural forests in the same region and contained one adult and eight seedling individuals of Aquilaria sinensis. This geomantic forest is a secondary evergreen broad-leaved forest with poor soil. In order to protect rare and endangered plants, as well as native species in this region, we suggest that all geomantic forests with rare and endangered plants in Guangzhou be set as small natural reserves that can be strictly managed. This kind of small natural reserve can facilitate the conservation of regional plant diversity and provide more ecosystem service.