EP7209 Datasheet, PDF (91/128 Pages) Cirrus Logic – Ultra-Low-Power Audio Decoder System-on-Chip

EP7209
5.16.3.11 Left Channel Transmit FIFO Not Full Flag (LCNF)
The left channel transmit FIFO not full flag (LCNF) is a read-only bit which is set when ever the left
channel transmit FIFO contains one or more entries which do not contain valid data. It is cleared when
the FIFO is completely full. This bit can be polled when using programmed I/O to fill the left channel
transmit FIFO. This bit does not request an interrupt.
5.16.3.12 Left Channel Receive FIFO Not Empty Flag (LCNE)
The left channel receive FIFO not empty flag (LCNE) is a read-only bit which is set when ever the left
channel receive FIFO contains one or more entries of valid data and is cleared when it no longer con-
tains any valid data. This bit can be polled when using programmed I/O to remove remaining data
from the receive FIFO. This bit does not request an interrupt.
5.16.3.13 FIFO Operation Completed Flag (FIFO)
The FIFO operation completed (FIFO) flag is set after the FIFO operation requested by writing to
DAIDR2 as completed.
FIFO is automatically cleared when DAIDR2 is read or written. This bit does not request an interrupt.
31:13
Reserved
6
RCNFLCTU
12
FIFO
5
LCRORCRO
11
LCNE
4
LCTURCTU
10
LCNF
3
LCRS
9
RCNE
2
LCTS
8
RCNF
1
LCRSRCRS
7
RCCELCRO
0
LCTSRCTS
Bit
Description
RCTS: Right Channel Transmit FIFO Service Request Flag (read-only)
0 — right channel transmit FIFO is more than half full (five or more entries filled) or DAI disabled
0
1 — right channel transmit FIFO is half full or less (four or fewer entries filled) and DAI operation
is enabled, interrupt request signaled if not masked
(if RCTM = 1)
RCRS: Right Channel Receive FIFO Service Request (read-only)
0 — right channel receive FIFO is less than half full (five or fewer entries filled) or DAI disabled
1
1 — right channel receive FIFO is half full or more (six or more entries filled) and DAI operation
is enabled, interrupt request signaled if not masked (if RCRM = 1)
LCTS: Left Channel Transmit FIFO Service Request Flag (read-only)
0 — Left Channel transmit FIFO is more than half full or less (four or fewer entries filled) or DAI
2
disabled.
1 — Left Channel transmit FIFO is half full or less (four or fewer entries filled) and DAI operation
is enabled, interrupt request signaled if not masked
(if LCTM = 1)
LCRS: 0 — Left Channel receive FIFO is less than half full (five or fewer entries filled) or DAI
3
disabled.
1 — Left Channel receive FIFO is half full or more (six or more entries filled) and DAI operation
is enabled, interrupt request signalled if not masked (if LCRM = 1)
Table 51. DAI Control, Data and Status Register Locations
DS453PP2
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