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CHAPTER 5 ETHERNET CONTROLLER
348
Preliminary User’s Manual S14767EJ1V0UM00
5.2.4.4 En_IPGR-Non Back to Back IPG Register (0CH R/W)
Bit
Field
Functions
Default
31:15
-
Reserved for future use. Write as 0
-
14:8
IPGR1
Carrier sense time:
This field sets the carrier sense time when the transmit operation is executed in non Back-to-
Back mode. The formula for the carrier sense time is:
Carrier sense time = (2 + IPGR1)
×
4 bits time
The carrier sense time defined in this field is included in the non Back-to-Back IPG defined
in the IPGR2 field.
0EH
7
-
Reserved for future use. Write as 0
-
6:0
IPGR2
Non Back-To-Back IPG:
This field sets IPG when transmit operation is executed with non Back-to-Back mode. The
formula for the non Back-to-Back IPG is:
IPG = (5 + IPGR2)
×
4 bits time
13H
5.2.4.5 En_CLRT-Collision Register (10H R/W)
Bit
Field
Functions
Default
31:14
-
Reserved for future use. Write as 0
-
13:8
LCOL
Late collision window:
This fields sets collision window size.
The formula for the collision window size is:
collision window size = (LCOL + 8)
×
8 bits time
38H
7:4
-
Reserved for future use. Write as 0
-
3:0
RETRY
Maximum number of retry:
This field sets the maximum number of retries during the transmission. If a retry occurs
beyond this value, the current transmission is aborted.
0FH
5.2.4.6 En_LMAX-Maximum Packet Length Register (14H R/W)
Bit
Field
Functions
Default
31:16
-
Reserved for future use. Write as 0
-
15:0
MAXF
Maximum packet length:
This field sets the maximum the length of transmit and receive packet by the octet when
En_MACC1 register: HUGEN bit is set to 1.
Receive: If the current receive packet length is greater than the value
of MAXF, MAC terminates the reception.
Transmit: If the current transmit packet length is greater than the value
of MAXF, MAC aborts the transmission.
600H