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UM10503
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© NXP B.V. 2015. All rights reserved.
User manual
Rev. 2.1 — 10 December 2015
853 of 1441
NXP Semiconductors
UM10503
Chapter 28: LPC43xx/LPC43Sxx Ethernet
28.6.34 DMA Interrupt enable register
The Interrupt Enable register enables the interrupts reported by the DMA_STAT register.
Setting a bit to 1 enables a corresponding interrupt. After a hardware or software reset, all
interrupts are disabled.
20
FTF
Flush transmit FIFO
This register field can be read by the application (Read), can be set to 1 by the
application with a register write of 1 (Write Set), and is cleared to 0 by the Ethernet
core (Self Clear). The application cannot clear this type of field, and a register write of
0 to this bit has no effect on this field.
When this bit is set, the transmit FIFO controller logic is reset to its default values and
thus all data in the Tx FIFO is lost/flushed. This bit is cleared internally when the
flushing operation is completed fully. The Operation Mode register should not be
written to until this bit is cleared. The data which is already accepted by the MAC
transmitter will not be flushed. It will be scheduled for transmission and will result in
underflow and runt frame transmission.
Remark:
The flush operation completes only after emptying the TxFIFO of its
contents and all the pending Transmit Status of the transmitted frames are accepted
by the host. In order to complete this flush operation, the PHY transmit clock is
required to be active.
0
R/W
21
-
Reserved
0
RO
23:22
-
Reserved
0
RO
24
DFF
Disable flushing of received frames
When this bit is set, the RxDMA does not flush any frames due to the unavailability of
receive descriptors/buffers as it does normally when this bit is reset. (See).
0
R/W
25
-
Reserved
0
RO
26
-
Reserved
0
RO
31:27
-
Reserved
0
RO
Table 637. DMA operation mode register (DMA_OP_MODE, address 0x4001 1018) bit description
…continued
Bit
Symbol
Description
Reset
value
Access
Table 638. DMA Interrupt enable register (DMA_INT_EN, address 0x4001 101C) bit description
Bit
Symbol
Description
Reset
value
Access
0
TIE
Transmit interrupt enable
When this bit is set with Normal Interrupt Summary Enable (bit 16 in this register),
Transmit Interrupt is enabled. When this bit is reset, Transmit Interrupt is disabled.
0
R/W
1
TSE
Transmit stopped enable
When this bit is set with Abnormal Interrupt Summary Enable (bit 15 in this register),
Transmission Stopped Interrupt is enabled. When this bit is reset, Transmission
Stopped Interrupt is disabled.
0
R/W
2
TUE
Transmit buffer unavailable enable
When this bit is set with Normal Interrupt Summary Enable (bit 16 in this register),
Transmit Buffer Unavailable Interrupt is enabled. When this bit is reset, Transmit
Buffer Unavailable Interrupt is disabled.
0
R/W