Data Sheet

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BDE Technology Inc.
BDE-WF3235
BDE Dual-Band WiFi MCU Module
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4.8.5.2 I2S
The McASP interface functions as a general-purpose audio serial port optimized for multichannel audio
applications and supports transfer of two stereo channels over two data pins. The McASP consists of transmit
and receive sections that operate synchronously and have programmable clock and frame-sync polarity. A
fractional divider is available for bit-clock generation.
 I2S Transmit Mode
Figure 4-7 shows the timing diagram for the I2S transmit mode.
Figure 4-7. I2S Transmit Mode Timing Diagram
Table 4-10 lists the timing parameters for the I2S transmit mode.
Table 4-10. I2S Transmit Mode Timing Parameters
ITEM
NAME
DESCRIPTION
MIN MAX
UNIT
T1
f
clk
(1)
Clock frequency
9.216
MHz
T2
t
LP
(1)
Clock low period
1/2 fclk
ns
T3
t
HT
(1)
Clock high period
1/2 fclk
ns
T4
t
OH
(1)
TX data hold time
22
ns
(1) Timing parameter assumes a maximum load of 20 pF.
 I2S Receive Mode
Figure 4-8 shows the timing diagram for the I2S receive mode.
Figure 4-8. I2S Receive Mode Timing Diagram
Table 4-11 lists the timing parameters for the I2S receive mode.
Table 4-11. I2S Receive Mode Timing Parameters
ITEM
NAME
DESCRIPTION
MIN MAX
UNIT
T1
f
clk
(1)
Clock frequency
9.216
MHz
T2
t
LP
(1)
Clock low period
1/2 f
clk
ns
T3
t
HT
(1)
Clock high period
1/2 f
clk
ns
T4
t
OH
(1)
RX data hold time
0
ns
T5
t
OS
(1)
RX data setup time
15
ns