Ac97 Mode - Freescale Semiconductor MCF5480 Reference Manual

Freescale semiconductor circuit board reference manual
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PSCBCLK
PSCFSYNC
PSCnTXD
PSCnRXD
The function of this mode is the same as 8-bit modem mode except that the transmit/receive data length is
16 bit.
26.4.5

AC97 Mode

Figure 26-32
shows the waveform in AC97 modem mode.
PSCBCLK
PSCnRTS
PSCnTXD
PSCnRXD
In AC97 mode, the PSCBCLK is the bit clock input and, different from 8/16 bit modem mode, the
PSCnRTS is the frame sync output.
Freescale Semiconductor
D15
D14 D13
D12 D11
D10 D9
D15
D14 D13
D12 D11
D10 D9
Figure 26-31. Waveform of Modem16 Mode
81.4 ns (12.288 MHz)
D15
D14
D1 D0
D15
D14
D1 D0
Slot #0 (16-bit)
Figure 26-32. Waveform of AC97 Mode
Figure 26-33
PSC
PSC_BIT_CLK
PSC_RTS
PSC_RXD
PSC_TXD
Figure 26-33. An Example Connection to AC97 CODEC
MCF548x Reference Manual, Rev. 3
D8 D7
D6 D5
D4 D3
D8 D7
D6 D5
D4 D3
20.8 µs (48.0 kHz)
D19 D18
D1
D0
D19 D18
D1
D0
Slot #1 (20-bit)
shows an example connection to a AC97 CODEC chip.
AC97 CODEC
BITCLK
SYNC
SDATA_IN
SDATA_OUT
RESET
XTL_IN
XTL_OUT
Functional Description
D2 D1 D0
D2 D1 D0
D19 D18
D1
D0
D15
D19 D18
D1
D0
D15
Slot #12 (20-bit)
D14
D14
26-39

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