Datasheet

ENC424J600/624J600
DS39935C-page 84  2010 Microchip Technology Inc.
FIGURE 9-2: EXAMPLES FOR SELECTING ETXLEN VALUES
00 1F 2E 3D 4C 5B 00 04 A3 11 22 33 80 00 00 01 02 28 00 00 00 00 00 00 1F 2E 3D
...
Destination
Address
Source
Address
Protocol Data Padding Next Packet
MAC address insertion disabled (TXMAC =
0)
Automatic padding disabled (PADCFG<2:0> =
000)
CRC generation enabled (TXCRCEN =
1)
80 00 00 01 02 28 00 00 00 00 00 00 1F 2E 3D
...
Destination
Address
Protocol Data Padding Next Packet
MAC address insertion enabled (TXMAC =
1)
Automatic padding disabled (PADCFG<2:0> =
000)
CRC generation enabled (TXCRCEN =
1)
80 00 00 01 02 28 00 1F 2E 3D
...
Destination
Address
DataProtocol Next Packet
MAC insertion enabled (TXMAC =
1)
Automatic padding enabled (PADCFG<2:0> = 101)
CRC generation enabled (TXCRCEN =
1)
...
...
...
00 1F 2E 3D 4C 5B
00 1F 2E 3D 4C 5B
0120h
0130h 0156h
015Bh
0120h 012Ah 0150h 0155h
0120h 012Ah 0150h
Example 1: Source Address and Padding Provided by Application
ETXST = 0120h
ETXLEN =
3Ch
Example 2: Padding Provided by Application, Source Address to be Inserted by ENCX24J600
Example 3: Source Address and Padding to be Inserted by ENCX24J600
ETXST = 0120h
ETXLEN =
36h
ETXST = 0120h
ETXLEN =
31h