CS4201 Datasheet, PDF (32/68 Pages) Cirrus Logic – CrystalClear Audio Codec 97 with headphone Amplifier

CS4201
4.16 Extended Modem ID Register (Index 3Ch)
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
ID1 ID0 0
0
0
0
0
0
0
0
0
0
0
0
0
0
ID[1:0]
Codec Configuration ID. Primary is 00; Secondary is 01,10,or 11. This is a reflection of the
ID[1:0]# configuration pins. The state of the ID[1:0] bits is determined at power-up from the
Codec ID[1:0]# pins and the current clocking scheme, see Table 17 on page 49.
Default
x000h. This value indicates no supported modem functions.
The Extended Modem ID Register (Index 3Ch) is a read/write register that identifies the CS4201 modem capabilities.
Writing any value to this location issues a reset to modem registers (Index 3Ch-54h), including GPIO registers
(Index 4Ch - 54h). Audio registers are not reset by a write to this location.
4.17 Extended Modem Status/Control Register (Index 3Eh)
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
0
0
0
0
0
0
0 PRA 0
0
0
0
0
0
0 GPIO
PRA
GPIO Powerdown. When ‘set’, the PRA bit powers down the GPIO subsystem. When the
GPIO section is powered down, all outputs must be tri-stated and input Slot 12 should be
marked invalid when the AC-link is active. To use any GPIO functionality PRA must be
cleared first. The Serial Data mode and the GPIO mode of operation are mutually exclusive.
To use any GPIO function, SDEN of the Serial Port Control Register (Index 6Ah) must be
‘clear’ prior to clearing PRA. If the SDEN bit is ‘set’, PRA is a read-only bit and always returns
‘1’.
GPIO
GPIO. When ‘set’, the GPIO bit indicates the GPIO subsystem is ready for use. When ‘set’,
input Slot 12 will also be marked valid.
Default
0100h
4.18 GPIO Pin Configuration Register (Index 4Ch)
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
0
0
0
0
0
0
0
0
0
0
0
0
0
0 GC1 GC0
GC[1:0]
GPIO Pin Configuration. When ‘set’, the GC[1:0] bits define the corresponding GPIO pin as
an input. When ‘clear’, the corresponding GPIO pin is defined as an output.
Default
0003h. This value corresponds to all GPIO pins configured as inputs.
After a Cold Reset or a modem Register Reset (see Extended Modem ID Register (Index 3Ch)), all GPIO pins are
configured as inputs. The upper 14 bits of this register always return ‘0’.
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DS483PP3