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CS8406 Datasheet

  • CS8406

  • 192 kHz Digital Audio Interface Transmitter

  • 40頁

  • CIRRUS

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CS8406
byte to be input to its control port. This byte will be written to both the A and B locations in the
addressed word.
One byte mode saves the user substantial control port access time, as it effectively accesses 2
bytes worth of information in 1 byte's worth of access time. If the control port's auto increment
addressing is used in combination with this mode, multi-byte accesses such as full-block reads
or writes can be done especially efficiently.
15.1.3.2 Two Byte mode
There are those applications in which the A and B channel status blocks will not be the same,
and the user is interested in accessing both blocks. In these situations, two byte mode should be
used to access the E buffer.
In this mode, a read will cause the CS8406 to output two bytes from its control port. The first byte
out will represent the A channel status data, and the 2nd byte will represent the B channel status
data. Writing is similar, in that two bytes must now be input to the CS8406's control port. The A
channel status data is first, B channel status data second.
15.2 AES3 User (U) Bit Management
The CS8406 U bit manager has two operating modes:
Mode 1. Transmit all zeros.
Mode 2. Block mode.
15.2.1 Mode 1: Transmit All Zeros
Mode 1 causes only zeros to be transmitted in the output U data, regardless of E buffer contents.
This mode is intended for the user who wants the output U channel to contain no data.
15.2.2 Mode 2: Block Mode
Mode 2 is very similar to the scheme used to control the C bits. Entire blocks of U data are buffered
using 2 block-sized RAMs to perform the buffering. The user has access to the first buffer, denoted
the E buffer, through the control port. It is the only mode in which the user can merge his own U data
into the transmitted AES3 data stream. The U buffer access only operates in two byte mode, since
there is no concept of A and B blocks for user data. The arrangement of the data is as followings:
Bit15[A7] Bit14[B7] Bit13[A6] Bit12 [B6]...Bit1 [A0] Bit0[B0]. The arrangement of the data in the each
byte is that the MSB is the first transmitted bit. The bit for the A subframe is followed by the bit for the
B subframe.
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DS580F1

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