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CHAPTER 5 ETHERNET CONTROLLER
Preliminary User’s Manual S14767EJ1V0UM00
347
5.2.4.2 En_MACC2-MAC Configuration Register 2 (04H R/W)
Bit
Field
Functions
Default
31:11
-
Reserved for future use. Write as 0
-
10
MCRST
MAC Control Block software reset:
Setting this bit to 1 forces MAC Control Block to a software reset operation.
In order to complete the software reset state, this bit needs to be cleared.
0
9
RFRST
Receive Function Block software reset:
Setting this bit to 1 forces the Receive Function Block to a software reset operation. In order
to complete the software reset state, this bit needs to be cleared.
0
8
TFRST
Transmit Function Block software reset:
Setting this bit to 1 forces Transmit Function Block to a software reset operation. In order to
complete the software reset state, this bit needs to be cleared.
0
7
-
Reserved for future use. Write as 0.
-
6
BPNB
Back Pressure No Back Off:
When this bit is set to 1, MAC transmits the packet with no backoff operation after the back
pressure operation only.
0
5
APD
Auto VLAN PAD:
When this bit is set to 1, if the ETPID field in the current transmit packet matches the value
in the En_VLTP register , MAC pads the current packet as a VLAN packet when the current
packet should be padded .
0
4
VPD
VLAN PAD mode:
When this bit is set to 1, MAC always pads the current packet as a VLAN packet when the
current packet should be padded.
0
3:2
-
Reserved for future use. Write as 0.
-
5.2.4.3 En_IPGT-Back to Back IPG Register (08H R/W)
Bit
Field
Functions
Default
31:7
-
Reserved for future use. Write as 0
-
6:0
IPGT
Back-To-Back IPG :
This field sets IPG when transmit operation is executed with Back-to-back mode. The
formula for the Back-to-Back IPG is:
IPG = (5 + IPGT)
×
4 bits time
13H