VoIP (AN374) questions

Hi all,

1) Firstly, I worked on a 3C40 FPGA devboard with a 1Gbe Marvell 88E1119R PHY.

At this time, I have a fully functionnal uClinux + Boa webserver system using Opencores 10/100 MAC, as described in this simple scheme :

http://img260.imageshack.us/img260/192/uclinuxopencoresmac.png

uClinux runs from the SDRAM memory and the Flash memory includes bootloader + JFFS2 file system....

2) Now, I want to add to this working design the Vider Over IP (AN374) block but only the Transmitter path, as described in this second scheme :

http://img191.imageshack.us/img191/5223/voipuclinuxtsemac.png

I have several high-level questions about this design :

+ Is it possible to use sdram controller instead of ddr sdram controller for the RTP transmitter buffering ?? I think here about latency issues...

+ If YES, is it possible to "share" the sdram between the uClinux system and the RTP transmitter ??

+ Is it possible to use the altera tse mac in the same time with uclinux (LAN --> webserver and webserver --> LAN) and with the data path (RTP + UDP/IP --> LAN) ??? What happened if uClinux and UDP/IP block sends data simultaneously to the MAC ???

Thanks for your precious help guys !!!

Papy