Medium Access Control (MAC) and Physical Layer (PHY) - CISE

4-June-07 P1901_PRO_016_r0
From IEEE 802.3 interface, the bytes are received in the following order: byte0, byte1, byte2 and byte3.
And from this 32 bits word, the bytes are transmitted into the LLC interface in the following order: byte3, byte2,
byte1, byte0. The packets are transmitted to the LLC in the way shown in Figure 66, starting from the top, since the
LLC works with bytes.
If we define N as the number of bytes in Data Payload plus the number of bytes of the Length/Type Field, then we
can write N = 4*m + p; with m an integer value and p equal to 0, 1, 2 or 3. The number of bytes in PLW is equal to
0 if p is equal to 0 or 4-p in the other cases, because the packet is 32 bit aligned.
Submission page 170 UPA-OPERA