NUC970 Technical Reference Manual
Publication Release Date: Dec. 15, 2015
- 617 -
Revision V1.30
NUC97
0
T
E
CHNIC
A
L
RE
F
E
RE
N
CE
MA
NUA
L
[19]
Reserved
Reserved.
[18]
FDUP
Full Duplex Mode Selection
The FDUP controls that if EMAC is operating on full or half duplex mode.
0 = EMAC operates in half duplex mode.
1 = EMAC operates in full duplex mode.
[17]
SQECHKEN
SQE Checking Enable Control
The SQECHKEN controls the enable of SQE checking. The SQE checking is only
available while EMAC is operating on 10M bps and half duplex mode. In other words, the
SQECHKEN cannot affect EMAC operation, if the EMAC is operating on 100M bps or full
duplex mode.
0 = SQE checking Disabled while EMAC is operating in 10Mbps and Half Duplex mode.
1 = SQE checking Enabled while EMAC is operating in 10Mbps and Half Duplex mode.
[16]
SDPZ
Send PAUSE Frame
The SDPZ controls the PAUSE control frame transmission.
If S/W wants to send a PAUSE control frame out, the CAM entry 13, 14 and 15 must be
configured first and the corresponding CAM enable bit of CAMEN register also must be
set. Then, set SDPZ to 1 enables the PAUSE control frame transmission.
The SDPZ is a self-clear bit. This means after the PAUSE control frame transmission has
completed, the SDPZ will be cleared automatically.
It is recommended that only enabling SPDZ while EMAC is operating in Full Duplex
mode.
0 = PAUSE control frame transmission completed.
1 = PAUSE control frame transmission Enabled.
[15:10]
Reserved
Reserved.
[9]
NDEF
No Deferral
The NDEF controls the enable of deferral exceed counter. If NDEF is set to high, the
deferral exceed counter is disabled. The NDEF is only useful while EMAC is operating on
half duplex mode.
0 = The deferral exceed counter Enabled.
1 = The deferral exceed counter Disabled.
[8]
TXON
Frame Transmission ON
The TXON controls the normal packet transmission of EMAC. If the TXON is set to high,
the EMAC starts the packet transmission process, including the TX descriptor fetching,
packet transmission and TX descriptor modification.
It is must to finish EMAC initial sequence before enable TXON. Otherwise, the EMAC
operation is undefined.
If the TXON is disabled during EMAC is transmitting a packet out, the EMAC stops the
packet transmission process after the current packet transmission finished.
0 = Packet transmission process stopped.
1 = Packet transmission process started.
[7]
PTP_SRC
PTP Counter Source Selection
This bit control the PTP counter source is from EMC0 or from EMC1 internally.
1’b0: The PTP counter source is from EMC1 internally
1’b1: The PTP counter source is from EMC0.
Note:
This bit is only available in EMAC1. In EMAC0, this bit is reserved.