Card
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M-Audio Revolution 7.1
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AK4381 <---> Envy24HT
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AK4381 CSN pin 6 <-> Envy24HT GPIO5 pin 57
AK4381 CCLK pin 7 <-> Envy24HT GPIO1 pin 51
AK4381 CDTI pin 8 <-> Envy24HT GPIO3 pin 53
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AK4355 <---> Envy24HT
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AK4355 CSN pin 10 <-> Envy24HT GPIO6 pin 58
AK4355 CCLK pin 11 <-> Envy24HT GPIO1 pin 51
AK4355 CDTI pin 12 <-> Envy24HT GPIO3 pin 53
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CDTI: 2^3=0x08
CCLK: 2^1=0x02
CS0: 2^5=0x20
CS1: 2^6=0x40
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GPIO DIR, MASK, STATE
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100 0000 0000 0000 1111 1010	(GPIO DIR: 0x4000FA)
011 1111 1111 1111 1000 0101	(GPIO MASK: 0xBFFF85, 0x3FFF85)
000 0000 0000 0000 0111 0010	(GPIO STATE: 0x72)
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E2PROM
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SCFG:	0x43
ACL:	0x80
I2S:	0xf8
SPDIF:	0xc1
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