IPaddressAssignment < BUCMSPublic

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---+ AMC13 IP and MAC Address Assignment

The AMC13 has two PCB Tongues.  Tongue 1 (T1) and Tongue 2 (T2) each has their own FPGA (Virtex6/Kintex7 for T1, Spartan6 for T2) and therefore each has their own IP address.  Typically T2 has an IP address one higher in the last octet than T1.

---+++ BU Crate MCH IP addresses
| MCH  | IP Address  |
| NAT MCH  | 192.168.1.41 |
| Vadatech MCH  | 192.168.1.2 |

---++ How the AMC13 IP Address is assigned
---+++ 1. Via the Serial Number

This scheme acts as the "backup" plan, using the jumper connections on T2 to assign IP addresses to both tongues
The address is 192.168.z.x
   * Final Byte for Spartan Chip (T2) = 254 - 2*SN[6:0]
   * Final Byte for Virtex/Kintex Chip (T1) = 255 - 2*SN[6:0].
*z* is 1 for SN 0-127 and 2 for SN 128-255 and 3 for SN 256-383.

<b>N.B.</b>Serial numbers 0, 128, 256 are not used as it would result in IP address ending in 255,
which can cause troubles on some networks.

---+++ 2. Via MMC SPI EEPROM

In this scheme, the MMC sends a configuration packet which contains the IP address to be assigned from non-volitile EEPROM to the Spartan and Virtex chips at powerup.  For information on how to load new configuration information into the SPI, see [[AMC13MmcSoftware][the MMC software page]]
---+++ 3. RARP from a software daemon.

RARP is enabled with an IP address beginning with 00 in the first octet is set using method 2 above.

Note that we are working out a new scheme as we go into mass production in early 2014.
We expect that the default addresses will be in the range 192.168.x.y where x is 1-4 and y is 128-254.
HCAL will use a crate-based scheme where x is the crate and y is 4*slot.

---++ AMC13 MAC address assignment

See [[https://twiki.cern.ch/twiki/bin/viewauth/CMS/CMSCommonMacAddresses]].

Firmware review reveals-

<pre>  nSN &lt;= not SerialNumber;
  mac =&gt; x"080030f30" & "000"                  & not nSN(7 downto 6) & '0' & nSN(5 downto 0)   #old T2
  mac =&gt; x"080030f30" & '0' & not nSN(8) & '0' & not nSN(7 downto 6) & '0' & nSN(5 downto 0),  #new T2
  mac &lt;= x"080030f30" & '0' & not nSN(8) & '0' & not nSN(7 downto 6) & '1' & nSN(5 downto 0);  #all T1
</pre>

So all MAC addr start with 08-00-30-F3.
The S/N bits are mapped to MAC address bits as follows:

| *MAC* | *Source* |
| 5:0 | not S/N( 5:0) |
| 6 | T2=0 T1=1 |
| 8:7 | S/N( 7:6) |
| 9 | '0' |
| 10 | S/N( 8) |
| 11 | '0' |
This results in a range of =00-00= to =01-FF= for AMC13 serial# 0-255
and =04-00= to =05-FF= for AMC13 serial# 256-511.

-- Main.EricHazen - 21 Mar 2016

---++ IP and MAC Address Calculator

Download and run [[http://physics.bu.edu/~cosbyc/AMC13/addressCalc.py][this python script]] ($ python !addressCalc.py -s serial_no), to get a quick printout of the IP and MAC address for a given SN

-- %USERSIG{ChristopherCosby - 04 Nov 2020}%
Topic revision: r26 - 04 Nov 2020 - ChristopherCosby