This product is covered by one or more of the following patents:
US5,307,459, US5,434,872, US5,732,094, US6,570,884, US6,115,776, and US6,327,625.
The RTL8019AS integrates the RTL8019A and 16K-byte SRAM in a single chip. It is designed not only to provide more friendly functions but also to save the effort of SRAM source and inventory. Most of the design spec. inherit from RTL8019A.