1. Hello Bob – An example application for the FPX
Applied Research Laboratory
Washington University, St. Louis

2. Overview Full FPX application (incl. RAD)
Parse UDP datagrams (using higher level framework)
Send datagram back (UDP Echo)
String match (“Hello”)
Use SRAM interface (to read name)
Replace data

3. Replacing the content

4. Simplified example Assume continuous data (easier for SRAM access)
Limit name length to 14 characters (incl. \0)
Name will fit in first cell
Don’t resize datagram (check for length)

5. Hello Bob Tarball
Download “hellobob.tar.gz” from (save under D:\)
Unpack
“cd d:”
“tar xvzf hellobob.tar.gz”
Archive contains tree below FPX_TREE/RAD

6. Compiling fpxlib Go to subdirectory “HelloBob/MODULES/LIB”
Compile processors by typing “make compile” in:
CellProcessor/sim
FrameProcessor/sim
IPProcessor/sim
UDPProcessor/sim

7. Dataflow
HelloBob/MODULES/HelloBob/vhdl/hello_bob.vhdl

8. Memory access Request memory when we receive frame
Sample grant (and store it) before we access memory
Save SRAM_GRANT on SOD
If we don’t get a grant use “John Doe”
Release memory after processing name

9. Statemachines

10. HelloBob module
HelloBob/MODULES/HelloBob/vhdl/module.vhdl

11. RAD core
HelloBob/TOP/RAD_HelloBob/vhdl/rad_hellobob.vhdl

12. Testbench
HelloBob/TOP/RAD_HelloBob/sim/testbench.vhdl

13. Compile Testbench Go to subdirectory “HelloBob/TOP/RAD_HelloBob/sim”
Compile RAD and testbench by typing “make compile”

14. Hello Bob Send control cell to write “Bob” to SRAM
Is read from EGRESSIN.DAT
Send UDP datagram with “Hello…..”
Is read from INGRESSIN.DAT
Datagram with “Hello Bob” should return
IP addresses and UDP ports should be swapped

15. Start simulator Go to subdirectory “HelloBob/TOP/RAD_HelloBob/sim”
Type “make sim” (simulator starts up)
Type “do testbench.do” (starts simulation)

16. Exercises Implement Memory Statemachine Generate SRAM_REQ
Sample SRAM_GRANT
Replace payload with name
Check terminating \0
Watch for “o_” and shift
HelloBob/MODULES/HelloBob/vhdl/hello_bob.vhdl

17. Terabit Burst Switching
9/11/98
Dataflow
Put multiplex figure here

18. Testfiles PROBE.DAT probe-request
SETVCI51.DAT control cell to change VCI from 0x32 to 0x33
SRAM_BOB.DAT write name “Bob” to SRAM
UDP7HELLO.DAT datagram with “Hello” on port 7
UDP7SALUT.DAT datagram with “Salut” on port 7
UDP8HELLO.DAT datagram with “Hello” on port 8
UDP51HELLO.DAT datagram with “Hello” on port 7, but VCI 0x33 (51)
UDP0HELLO.DAT TTL field is zero

19. Other tests Send “Salut” instead of “Hello” (UDP7SALUT.DAT)
Type “cp UDP7SALUT.DAT INGRESSIN.DAT”
Run test again
Use port 8 instead of 7 (UDP8HELLO.DAT)
NOTE: testdata to HelloBob is read from INGRESSIN.DAT, testdata to the CCP is read from EGRESSIN.DAT

20. Hello <Your Name>
Login to jeeves (login on two terminals)
User: workshop##
ex: workshop71 (port 7 stack 1)
Password: workshop##
Invoking fpx_control
fpx_control fpx_number
ex: fpx_control 7.1
Writing String
enable rad logging: g rad
Write string: ws mod_num address ‘your name’
ex: ws 1 0 ‘Bob Smith’

21. Hello <Your Name> (cont)
Open log_file in second terminal
vi rad_log_xx.txt
Copy cell to clipboard
Highlight cell in vi
Right click on xterm in toolbar
Edit -> Copy X Selection -> To Clipboard
Paste Selection in notepad
Start -> Run -> notepad
Edit -> Paste
Save file as “EGRESSIN.DAT”

22. Different application VCI
We will change the application VCI (0x32 to 0x33) by sending a control cell to the CellProcessor
Create a new INGRESSIN.DAT from SETVCI51.DAT and UDP7HELLO.DAT
Type “cat SETVCI51.DAT UDP7HELLO.DAT > INGRESSIN.DAT”
Use UDP packet on channel 0x33 (51): UDP51HELLO.DAT

23. Probe Request
Sending a Probe-Request to the CellProcessor results in a “Generic CellProcessor Version 1.0” response
Use PROBE.DAT to send control cell

24. Change Probe Response
Change Probe Response in CellProcessor to “Hello Bob Version 1.0” H e l o B b V r s i n 1 . 48 65 6c 6f 20 42 62 56 72 73 69 6e 31 2e 30
HelloBob/MODULES/LIB/CellProcessor/vhdl/cellproc.vhdl

25. AAL5 Errors Change payload word, do not change the CRC
CRC field is non-zero (=error) in FrameProcessor

26. TTL of zero IP packets with TTL==zero are dropped (UDP0HELLO.DAT)
Frame does not appear on data output