Low-Power high-pin-count w/ USB

Hello again,

I need an 8051 variant which can handle USB2.0 (Full or High-Speed) and has a full 16-bit external address space (w/ data-bus of course): I shall be bank-switching for a 2Mx8 storage area.

I don't mind splitting the design into a small (very small USB to UART) mated to a high-pin-count 8051 flavored IC. Naturally power-consumption is a huge issue: LOW POWER.

I was going to use ST-Microelectronics uPSD3454x but they are discontinuing it. Now I must convert the design over to a [production] part.

I concidered using Actel's FPGA with embedded Core8051 or Cortex M-1, but the demanding qualities of the project prohibit that avenue at this time.

I've been looking at SilLabs, yet many of the bells-n-whistles aren't needed.

Requirement 1.0
---------------
Low Power--Battery Operated with USB charge capability

Requirement 1.0.1
-----------------
Sleep Mode, and Power-down mode (wake-up on NMI)

Requirement 1.0.2
-----------------
Capable of data-logging for 24+ hours at 'full operation'

Requirement 1.1
---------------
Needs to address up to (and maybe more than) 2Mx8 external low-power RAM

Requirement 1.2
---------------
USB is the primary mode of PC\device communication.
Requirement 1.2.1
-----------------
USB 1.1 would suffice for such low content (2Mx8)

Requirement 1.3
---------------
Capable of interfacing to an FPGA for dual User Graphics 162 x 96 [each] engine

A low-power ARM [Cortex] would be a possibility, but I think it is over-kill.

Q1) What is a high-pin count, low-power 8051 with Flash (64k would be nice)?
Q2) What is the smallest and lowest power USB to UART device.

I figured that erik, per, Andy, and Tamir might have a quick answer... and not the Keil parametric search.

Sincerely,

--Cpt. Vince Foster
2nd Cannon Place
Fort Marcy Park, VA