The new eZ80 Internet Engine is a synthesizable core that retains compatibility with the original, and according to Zilog offers "a clear migration path" for existing Z80 customers.
The eZ80 essentially combines microprocessor and DSP digital signal processing capabilities onto a single chip, also embedding an optimized TCP/IP stack and linear addressing that supports up to 16Mb of addressing space.
Because it's a synthesizable core, the eZ80 should be easily portable to any process geometry, from .5 to .18 micron and beyond.
CMX-MicroNet supports more 8-bit and 16-bit microprocessors than any other existing solution, including full support for all derivatives of the 8051, the Atmel AVR, Hitachi's H8S/300H and H8S/2000, the Infineon 80C16x, the STMicroelectronics ST10, and most recently, the Microchip PIC18CXXX, the Mitsubishi M16C, the Philips 8051-XA, and ZiLOG's Z80, Z180, and eZ80 series of processors.
To take advantage of the CMX Ethernet Driver Program, the embedded systems engineer must be using one of the wide range of processors currently supported by CMX-MicroNet, including the 8051, the Atmel AVR, Hitachi's H8S/300H and H8S/2000, the Infineon 80C16x, the Microchip PIC18CXXX, the Mitsubishi M16C, the Philips 8051-XA, the STMicroelectronics ST10, and ZiLOG's Z80, Z180, and eZ80 series of processors.