CS4294SLASHCS4298 datasheet(36/66 Pages) CIRRUS

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CS4202

DS549PP2

4.21

GPIO Pin Wakeup Mask Register (Index 52h)

GW[4:0]

GPIO Pin Wakeup. This register provides a mask for determining if an input GPIO change will

generate a wakeup event (0 = no, 1 = yes). When the AC-link is powered up, a wakeup event

will be communicated through the assertion of GPIO_INT = 1 in input Slot 12. When the

AC-link is powered down (Powerdown Control/Status Register (Index 26h) bit PR4 = 1 for pri-

mary codecs), a wakeup event will be communicated through a ‘0’ to ‘1’ transition on

SDATA_IN.

Default

0000h

GPIO bits which have been programmed as inputs, “sticky”, and “wakeup”, upon transition either (high-to-low) or

(low-to-high) depending on pin polarity, will cause an AC-link wakeup if and only if the AC-link was powered down.

Once the controller has re-established communication with the CS4202 following a Warm Reset, it will continue to

signal the wakeup event through the GPIO_INT bit of input Slot 12 until the AC ’97 controller clears the inter-

rupt-causing bit in the GPIO Pin Status Register (Index 54h); or the “wakeup”, config, or “sticky” status of that GPIO

pin changes.

After a Cold Reset or a modem Register Reset (see Extended Modem ID Register (Index 3Ch)) this register defaults

to all 0’s, specifying no wakeup event. The upper 11 bits of this register always return ‘0’.

4.22

GPIO Pin Status Register (Index 54h)

GI[4:0]

GPIO Pin Status. This register reflects the state of all GPIO pin inputs and outputs. These

values are also reflected in Slot 12 of every SDATA_IN frame. GPIO inputs configured as

“sticky” are ‘cleared’ by writing a ‘0’ to the corresponding bit of this register. The GPIO_INT

bit in input Slot 12 is ‘cleared’ by clearing all interrupt-causing bits in this register.

Default

0000h

GPIO pins which have been programmed as inputs and “sticky”, upon transition either (high-to-low) or (low-to-high)

depending on pin polarity, will cause the individual GI bit to be ‘set’, and remain ‘set’ until ‘cleared’. GPIO pins which

have been programmed as outputs are controlled either through output Slot 12 or through this register, depending

on the state of the GPOC bit in the Misc. Crystal Control Register (Index 60h). If the GPOC bit is ‘cleared’, the GI

bits in this register are read-only and reflect the status of the corresponding GPIO output pin ‘set’ through output

slot 12. If the GPOC bit is ‘set’, the GI bits in this register are read/write bits and control the corresponding GPIO

output pins.

The default value is always the state of the GPIO pin. The upper 11 bits of this register should be forced to zero in

this register and input Slot 12.

4.23

AC Mode Control Register (Index 5Eh)

ASPM

Analog S/PDIF Mode. The ASPM bit controls the input source to the S/PDIF transmitter block.

When ‘clear’, the S/PDIF transmitter will receive data from the corresponding AC-link output

slots. The actual slots are determined by the state of the SPSA[1:0] bits in the Extended Audio

Status/Control Register (Index 2Ah). If ‘set’, the S/PDIF transmitter block will receive data

D15

D14

D13

D12

D11

D10

00000000000

GW4

GW3

GW2

GW1

GW0

D15

D14

D13

D12

D11

D10

00000000000

GI4

GI3

GI2

GI1

GI0

D15

D14

D13

D12

D11

D10

0000

ASPM

TMM

DDM

ASA1

ASA0

CS4294/CS4298 数据表(PDF) 36 Page - Cirrus Logic

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