UM10503
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User manual
Rev. 1.3 — 6 July 2012
1059 of 1269
NXP Semiconductors
UM10503
Chapter 41: LPC43xx I2S interface
System signaling occurs when a level detection is true and enabled.
Table 926. Conditions for FIFO level comparison
Level Comparison
Condition
dmareq_tx_1
tx_depth_dma1 >= tx_level
dmareq_rx_1
rx_depth_dma1 <= rx_level
dmareq_tx_2
tx_depth_dma2 >= tx_level
dmareq_rx_2
rx_depth_dma2 <= rx_level
irq_tx
tx_depth_irq >= tx_level
irq_rx
rx_depth_irq <= rx_level
Table 927. DMA and interrupt request generation
System Signaling
Condition
irq
(irq_rx & rx_irq_enable) | (irq_tx & tx_irq_enable)
dmareq[0]
(dmareq_tx_1 & tx_dma1_enable ) | (dmareq_rx_1 &
rx_dma1_enable )
dmareq[1]
( dmareq_tx_2 & tx_dma2_enable ) | (dmareq_rx_2 &
rx_dma2_enable )
Table 928. Status feedback in the STATE register
Status Feedback
Status
irq
irq_rx | irq_tx
dmareq1
(dmareq_tx_1 | dmareq_rx_1)
dmareq2
(dmareq_rx_2 | dmareq_tx_2)