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UM10503
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© NXP B.V. 2015. All rights reserved.
User manual
Rev. 2.1 — 10 December 2015
1208 of 1441
NXP Semiconductors
UM10503
Chapter 44: LPC43xx/LPC43Sxx I2S interface
44.6.4 Receive FIFO register
The I2SRXFIFO register provides access to the receive FIFO.
44.6.5 I2S Status Feedback register
The STATE register provides status information about the I2S interface.
44.6.6 I2S DMA Configuration Register 1
The DMA1 register controls the operation of DMA request 1. The function of bits in DMA1
are shown in
. Refer to
for details of DMA operation.
This register enables the DMA for the I
2
S receive and transmit channels and sets the
FIFO level.
Table 1003.Transmit FIFO register (TXFIFO, address 0x400A 2008 (I2S0) and 0x400A 3008
(I2S1)) bit description
Bit
Symbol
Description
Reset value
31:0
I2STXFIFO
8 x 32-bit transmit FIFO.
0
Table 1004.I2S Receive FIFO register (RXFIFO, address 0x400A 200C (I2S0) and 0x400A 300C
(I2S1)) bit description
Bit
Symbol
Description
Reset value
31:0
I2SRXFIFO
8 x 32-bit receive FIFO.
0
Table 1005.I2S Status Feedback register (STATE, address 0x400A 2010 (I2S0) and 0x400A
3010 (I2S1)) bit description
Bit
Symbol
Description
Reset
value
0
IRQ
This bit reflects the presence of Receive Interrupt or Transmit
Interrupt. This is determined by comparing the current FIFO
levels to the rx_depth_irq and tx_depth_irq fields in the IRQ
register.
1
1
DMAREQ1
This bit reflects the presence of Receive or Transmit DMA
Request 1. This is determined by comparing the current FIFO
levels to the rx_depth_dma1 and tx_depth_dma1 fields in the
DMA1 register.
1
2
DMAREQ2
This bit reflects the presence of Receive or Transmit DMA
Request 2. This is determined by comparing the current FIFO
levels to the rx_depth_dma2 and tx_depth_dma2 fields in the
DMA2 register.
1
7:3
-
Reserved.
0
11:8
RX_LEVEL
Reflects the current level of the Receive FIFO.
0
15:12
-
Reserved, user software should not write ones to reserved bits.
The value read from a reserved bit is not defined.
-
19:16
TX_LEVEL
Reflects the current level of the Transmit FIFO.
0
31:20
-
Reserved, user software should not write ones to reserved bits.
The value read from a reserved bit is not defined.
-