CS4298 Datasheet, PDF (34/52 Pages) Cirrus Logic – SoundFusion Audio/Modem Codec 97 (AMC 97)

CS4298
6.1.32 GPIO Pin Wakeup Mask (Index 4Ch)
D15 D14 D13 D12 D11 D10 D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
GW9 GW8 GW7 GW6 GW5 GW4 GW3 GW2 GW1 GW0
GS[9:0]
Default
Wake up mask. If set, allow the GPIO input to generate AC-LINK wake up protocol.
0000h
The CS4298 has the ability to generate a “wake up” cycle by a transition of a GPIO pin when the
AC-Link has been powered down. If a mask bit is set, a one being set in the corresponding GPIO Pin
Status (Index 54h) will initiate a wake up interrupt. Bit 0 of SDATA_IN Slot 12 will be set indicating
a GPIO interrupt. GPIO pins must be defined as “input”, “sticky”, and the mask set to allow a GPIO
interrupt. The GPIO interrupt is cleared by writing a 0 to the respective status bit in GPIO Pin Status
(Index 54h) register.
6.1.33 GPIO Pin Status (Index 54h)
D15 D14 D13 D12 D11 D10 D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
GI9 GI8 GI7 GI6 GI5 GI4 GI3 GI2 GI1 GI0
GI[9:0]
GPIO pin status. Reflects the state of all GPIO pins either input or output. If the GPIO pin is defined as
an output, the respective bit reflects the state of SDATA_OUT Slot 12. If the GPIO pin is defined as an
input, the register is reflected in SDATA_IN Slot 12. GPIO output pins cannot be accessed by Slot 1,2
register access, only by SDATA_OUT Slot 12.
6.1.34 Misc. Modem AFE Status (Index 56h)
Mode D15 D14 D13 D12 D11 D10 D9 D8
0
HSB2 HSB1 HSB0
1
2
3
HSB[2:0]
L2B[2:0]
L1B[2:0]
Handset Loopback.
Line 2 Loopback.
Line 1 Loopback.
D7 D6 D5 D4
L2B2 L2B1 L2B0
D3 D2 D1
L1B2 L1B1
L1B2 L1B1
L1B2 L1B1
D0
L1B0
L1B0
L1B0
Default
0000h.
Loop Back Mode
HSB[2:0], L2B[2:0], L1B[2:0]
000
001
010
011
100
101
110-111
Function
Disabled
Digital Loop Back
Local Analog Loop Back
DAC to ADC 1-Bit data Loop Back
Remote Analog Loop Back
AC-Link Loop Back
Not Used
Table 8. Misc. Modem Configuration
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DS315PP2