IBM PowerPC 405GP User Manual

Bits Bit Name
Bit Description
Mode
9 Replace source address o EMAC will not replace source address.
W
1 EMAC replaces the source address field in the packet to be
transmitted using the content of the
Individual Address High
(EMACO_IAHR) and Individual Address Low
(EMACO_IALR) Registers.
10 Insert VLAN Tag o EMAC will not insert a VLAN tag.
W
1 EMAC inserts the VLAN Tag field into the packet to be
transmitted using the content of the VLAN
TPID register
(EMACO_VTPID).
11 Replace VLAN Tag
o EMAC will not replace the VLAN tag.
W
1 EMAC replaces the VLAN Tag field in the packet to be
transmitted using the content of the VLAN
TPID register
(EMACO_
VTPID).
TX Status Information (Read Access)
6 Bad FCS on transmitted o FCS was correct in the transmitted packet.
R
frame
1
Indicates that a bad FCS was found in the transmitted
packet.
7 Bad previous packet in o Packet transmission OK.
R
dependent mode
1
Indicates that a Descriptor Error, Transmit Error, or SQE
Error occurred in the previously transmitted frame. This bit
will only be activated in dependent mode.
8 Loss
of carrier sense o No loss of carrier.
R
1 During the transmission of a frame, the
PHY _CRS input
was de-asserted after it previously was asserted, or it was
not asserted at
all.
9 Excessive deferral o No excessive deferral.
R
1
Indicates that the current frame has been deferred for an
excessive period of time. Applicable only in half duplex
mode. The value of this period in bit times is calculated in
the following ways: For 10/100 Mbps operation it is: 2 x
(maxFrameSize x 8) bit times.
10 Excessive collisions
o Less than 16 collisions.
R
1
Indicates that the current frame transmission had ended
with a
collision on the 16th consecutive attempt. Applicable
only
in half-duplex mode.
11 Late collision
o No late collision.
R
1 Frame
collided outside of the collision window. Applicable
only
in half-duplex mode.
12
Multiple collision
o More than 1 but less than 16 collisions did not occur.
R
1 Transmitted frame
collided more than once but less than 16
times.
Applicable only in half-duplex mode.
13
Single collision o Single collision did not occur.
R
1
Activates if transmitted frame collided once. Applicable only
in half-duplex mode.
14 Underrun
o Underrun did not occur.
R
1 Frame transmission was aborted because of underrun;
data from the Transmit
FIFO was not valid in time to allow
continuous data transmission on the Mil interface.
19-8
PPC405GP User's Manual
Preliminary

IBM PowerPC 405GP Specifications

General

Brand	IBM
Model	PowerPC 405GP
Category	Computer Hardware
Language	English