
Agere Systems Inc.
117
Data Sheet
July 2001
T8302 Internet Protocol Telephone
Advanced RISC Machine (
ARM
)
10 Ethernet 10/100 MAC
(continued)
Table 96. MAC Transmit Status Register
(continued)
Bit #
9
Name
LCRS
Description
Loss of carrier (active-high).
Indicates that the
CRS
input was inactive for one or more
bit times while the transmitter is active and in half-duplex.
Valid on the positive edge of
TX_CLK
.
Transmission aborted (active-high).
Indicates that a transmission has been aborted
before completion. This signal is cleared prior to the start of the next packet.
8
ABORTED
Valid on the positive edge of
TX_CLK
.
Late collision (active-high).
Indicates that a collision occurred more than 512 bit times
from the start of a transmission. The start of transmission is defined as the transmis-
sion of the first bit of preamble.
7
LATE
Valid on the positive edge of
TX_CLK
.
MAC pause control frame transmitted. Indicates that the last packet sent was a MAC
pause control frame.
6
TCNTRL
Valid on the positive edge of
TX_CLK
.
SQE test failed (active-high).
Indicates that a
COL
signal was not detected during the
first 6.4
μ
s of interframe gap following a transmit attempt.
SQE
is inactive if the
ISQE
input is high. This signal is only useful during test.
5
SQEFAIL
Valid on the positive edge of
TX_CLK
.
Pause active (active-high).
Active while the transmitter is blocked from transmitting
after the reception of a pause command.
4
PAUSEACTIVE
This output is synchronous with
TXC
.
VLAN type2 frame.
When this signal is set, the current transmission is tagged with a
VLAN type2 ID. The thirteenth and fourteenth bytes at the frame are compared to the
VLAN type2 type/length field register
.
3
TX_VLAN2
This signal is set if there is a nonzero match.
VLAN type1 frame.
When this signal is set, the current transmission is tagged with a
VLAN type1 ID. The thirteenth and fourteenth bytes at the frame are compared to the
VLAN type1 type/length field register
.
2
TX_VLAN1
This signal is set if there is a nonzero match.
Transmit broadcast (active-high). Active from
TXEOP
(
FCEOP
) to
TXSOP
(
FCSOP
) of
the following frame, synchronous with
TXC
.
TXEOP
can be used to strobe
TXBROAD
.
1
TXBROAD
TXBROAD
is active if the transmitted frame has a destination address of all ones.
Transmit multicast (active-high).
Active from
TXEOP
(
FCEOP
) to
TXSOP
(
FCSOP
) of
the following frame, synchronous with
TXC
.
TXEOP
can be used to strobe
TXMULT
.
0
TXMULT
TXMULT
is active if the transmitted frame has a destination address with the first trans-
mitted address bit a 1, and at least one of the following 47 address bits a 0.