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S3C2416X RISC MICROPROCESSOR
AC97
CONTROLLER
24-5
4 AC-LINK DIGITAL INTERFACE PROTOCOL
Each AC97 Codec incorporates a five-pin digital serial interface that links it to the S3C2416 AC97 Controller. AC-
link is a full-duplex, fixed-clock, PCM digital stream. It employs a time division multiplexed (TDM) scheme to
handle control register accesses and multiple input and output audio streams. The AC-link architecture divides
each audio frame into 12 outgoing and 12 incoming data streams. Each stream has 20-bit sample resolution and
requires a DAC and an analog-to-digital converter (ADC) with a minimum 16-bit resolution.
SYNC
SDATA_OUT
SDATA_IN
Slot #
TAG
CMD
ADDR
CMD
DATA
PCM
PCM
RSRVD
TAG
STATUS
ADDR
STATUS
DATA
PCM
LEFT
PCM
RIGHT
0
1
2
3
4
5
6
7
8
9
10
11
12
RSRVD
RSRVD
RSRVD
RSRVD
RSRVD
RSRVD
RSRVD
RSRVD
RSRVD
RSRVD
RSRVD
RSRVD
RSRVD
RSRVD
PCM
MIC
LEFT
RIGHT
TAG
Phase
Data
Phase
Figure 24-4. Bi-directional AC-link Frame with Slot Assignments
Figure 24-4 shows the slot definitions that the S3C2416 AC97 Controller supports. The S3C2416 AC97 Controller
provides synchronization for all data transaction on the AC-link.
A data transaction is made up of 256 bits of information broken up into groups of 13 time slots and is called a
frame. Time slot 0 is called the Tag Phase and is 16 bits long. The other 12 time slots are called the Data Phase.
The Tag Phase contains one bit that identifies a valid frame and 12 bits that identify the time slots in the Data
Phase that contain valid data. Each time slot in the Data Phase is 20 bits long. A frame begins when SYNC goes
high. The amount of time that SYNC is high corresponds to the Tag Phase. AC97 frames occur at fixed 48 kHz
intervals and are synchronous to the 12.288 MHz bit rate clock, BITCLK. The controller and the Codec use the
SYNC and BITCLK to determine when to send transmit data and when to sample received data. A transmitter
transitions the serial data stream on each rising edge of BITCLK and a receiver samples the serial data stream on
falling edges of BITCLK. The transmitter must tag the valid slots in its serial data stream. The valid slots are
tagged in slot 0. Serial data on the AC-link is ordered most significant bit (MSB) to least significant bit (LSB). The
Tag Phase’s first bit is bit 15 and the first bit of each slot in Data Phase is bit 19. The last bit in any slot is bit 0.
Содержание S3C2416
Страница 33: ...S3C2416X RISC MICROPROCESSOR PRODUCT OVERVIEW 1 5 3 BLOCK DIAGRAM Figure 1 1 S3C2416X Block Diagram ...
Страница 38: ...PRODUCT OVERVIEW S3C2416X RISC MICROPROCESSOR 1 10 153 AIN 1 U14 195 EINT 10 GPG2 K15 237 SDATA 14 C18 ...
Страница 122: ...BUS MATRIX EBI S3C2416X RISC MICROPROCESSOR 3 4 NOTES ...
Страница 204: ...DMA CONTROLLER S3C2416X RISC MICROPROCESSOR 8 18 NOTES ...
Страница 284: ...WATCHDOG TIMER S3C2416X RISC MICROPROCESSOR 11 6 NOTES ...
Страница 320: ...REAL TIME CLOCK S3C2416X RISC MICROPROCESSOR 13 16 NOTES ...
Страница 344: ...UART S3C2416X RISC MICROPROCESSOR 14 24 NOTES ...
Страница 380: ...USB2 0 DEVICE S3C2416X RISC MICROPROCESSOR 16 34 NOTES ...
Страница 432: ...2D S3C2416X RISC MICROPROCESSOR 18 38 NOTES ...
Страница 446: ...HS_SPI CONTROLLER S3C2416X RISC MICROPROCESSOR 19 14 NOTES ...
Страница 455: ...S3C2416X RISC MICROPROCESSOR HSMMC CONTROLLER 20 9 4 9 SD COMMAND ISSUE SEQUENCE Figure 20 9 Timeout Setting Sequence ...
Страница 604: ...S3C2416X RISC MICROPROCESSOR S3C2416X RISC MICROPROCESSOR 23 22 NOTES ...
Страница 638: ...PCM AUDIO INTERFACE S3C2416X RISC MICROPROCESSOR 25 18 NOTES ...
Страница 653: ...S3C2416X RISC MICROPROCESSOR ELECTRICAL DATA 26 15 Figure 26 14 SDRAM READ WRITE Timing Trp 2 Trcd 2 Tcl 2 DW 16 bit ...
Страница 670: ...ELECTRICAL DATA S3C2416X RISC MICROPROCESSOR 26 32 NOTES ...
Страница 672: ...MECHANICAL DATA S3C2416X RISC MICROPROCESSOR 30 2 Figure 27 2 330 FBGA 1414 Package Dimension 2 Bottom View ...