Lpc2000

> 1) The LPC2148 supports USB 2.0 in full speed. Is this backward 
> compatible to the 12 MBit/s when i have only an USB 1.1 host (e.g. 
> my laptop) ?  

USB 2.0 low and full speed devices should work with 1.1 hosts and hubs. 
 
> 2) Can i use choose from different oscillators (e.g. my favorite 
> 14,745 MHz, because of the possible variety of UART baudrates, also 
> high ones) or is it restricted e.g. to a 24 MHz oscillator if i want 
> to use USB ?

As I see it USB part has seperate PLL and therefore 14,745 could be
used (or any other). What I'd like to see in LPC2000 series is
additional CCLK divider on all chips. Or 32kHz PLL.

> 3) Is there any suggested pcb layout for the USB lines of the 
> LPC2148 from philips ? Ok, i think i must use the shortest lines for 
> D+ and D-, but is there a need for ground planes, filters,... ? Just 
> for a quick prototype, to get it up and running, is this also 
> needed ? I think bits are going over D+ and D- with 480 MBit/s, even 
> when only 12 MBit/s are used for LPC2148. Is this correct ?

Keep D+ and D- together and equal in length. 


> 4) What is "Soft Connect USB Feature" in detail ?

That means that you can control USB connection with software. I don't
think this is the case here. External resistor and switch are
connected (to pull up D+ i.e.) to output pin of LPC214x while in
ISP1181 you don't need all that (I heard somewhere that ISP1181 is
inside of LPC214x). 

> 5) As earlier mentioned in a posting in the mailinglist, is it 
> correct, that the two 33 Ohm resistors sit in line of D+ and Vbus 
> and not in lines D+ and D- ? What is Vbus in generally used, just to 
> detect the presence of power from host ? So in general every 
> interrupt line can be used ? Or is there something special, e.g. to 
> detect if voltage is enough ?

Put two resistors in line of D+ and D-. As I can see in datasheet the
correct value is 18 Ohm. Total driver resistance is between 29 and 44
Ohm with note that this includes 18 Ohm external resistors on D+ and D-.
Vbus is used for detection and power supply (read the specification
for limitations). 

> 6) What is Philips delivering for USB of LPC2148 ? A library 
> (compiled for different compilers like gcc, ...) ? Example code for 
> a minimal / complete USB stack ? How much Flash / RAM will be 
> needed ? Will there be any example code for ARM of a serial 
> interface ? Any x86 code for host side (Windows / Linux) ? Will the 
> offered parts be free of charge or cost something ? When will it be 
> available ?

Nothing for now. :) Examples are available for standalone USB devices
and could be implemented with LPC214x with little effort (no user
LPC214x manual no USB).

> 7) When will a detailed User Manual be available for the LPC2148 ?

I hope very soon. 

BR,
Slawc