(r24) 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].
<b>z</b> 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]].

For all AMC13XG with current firmware, the MAC address is in the range
=08-00-30-F3-00-00= to =08-00-30-F3-01-FF= with the low 9 bits as follows:

<pre>
  bits 0-5     complement of serial number bits 0-5
  bit 6        =0 for T2 board (lower IP)
               =1 for T1 board (upper IP)
  bit 7, 8     serial number bits 6, 7 (complemented for S/N > 64) 
</pre>


Example:

If we have a board with serial number 37, we can calculate the last digit of the MAC address:

63-37 = 26, which is =0x1a= in hex

SN37 MAC addresses:

  =08-00-30-F3-00-1a= (for T2, low IP)and

  =08-00-30-F3-00-5a= (for T1, higher IP)

For modules with serial numbers above 63 the upper two bits are complemented and assigned to MAC address bits 7, 8.

example
SN66 (0b01000010)

|                    |bit 8 | bit 7 | bit 6 | bit 5 | bit 4 | bit 3 | bit 2 | bit 1 | bit0 |
|66 (inserted) | 0       | 1     |         | 0      | 0      | 0      | 0     | 1      | 0     |
|                     | upper 2 bits| |       |lower | six   | bits   |        |         |        |
|compliment   | 1        | 0     |         | 1      | 1      | 1      | 1      | 0     | 1     |
|                     |Byte2 |Byte 1|        |        |          | Byte 0 |      |        |        |
| 66 T2           | 1       | 0     | 0       | 1      | 1      | 1      | 1      | 0     | 1     |
| 66 T2           |1        | 3     |          |        |          | d      |         |        |        |
| 66 T1           | 1       | 0     | 1       | 1      | 1      | 1      | 1      | 0     | 1     |
| 66 T1           |1        | 7     |          |        |          | d      |         |        |        |

SN66 MAC addresses:

  =08-00-30-F3-01-3d= (for T2, low IP)and

  =08-00-30-F3-01-7d= (for T1, higher IP)

-- Main.EricHazen - 12 Mar 2014
Topic revision: r24 - 16 Sep 2015 - EricHazen