CS8412 datasheet(16/38 Pages) CIRRUS

16 / 38 page

CS8411 CS8412

DS61F1

status byte 15, location 17H is written. If the corre-

sponding interrupt enable bit in IER1 is set, a tran-

sition of FLAG1 will generate a pulse on the

interrupt pin. Figure 12 illustrates the memory

write sequence for buffer mode 0 along with flag

timing. The arrows on the flag timing indicate

when an interrupt will occur if the appropriate in-

terrupt enable bit is set. FLAG0 can cause an inter-

rupt on either edge, which is only shown in the

expanded portion of the figure for clarity.

Buffer Mode 1

In buffer mode 1, eight bytes are allocated for chan-

nel status data and sixteen bytes for auxiliary data

as shown in Figure 5. The user data buffer is the

same for all modes. The channel status buffer, loca-

tions 08H to 0FH, is divided into two sections. The

first four locations always contain the first four

bytes of channel status, identical to mode 0, and are

written once per channel status block. The second

four locations, addresses 0CH to 0FH, provide a

cyclic buffer for the last 20 bytes of channel status

data. The channel status buffer is divided in this

fashion because the first four bytes are the most im-

Flag 0

Flag 1

Mode 0

Flag 1

Modes 1 & 2

Flag 2

B 0

A 0

B 1

A 1

B 2

A 2

B 7

A 7

Aux Data

03 4

LSB

Audio Data

Preamble

28 29 30 31

VU CP

MSB

(384 Audio Samples)

23 012

4567

9 101112 13 14 15 16 17 18 19 20 21 22 23 01

Channel Status Byte

(Expanded)

bit

Frame

Sub-frame

Block

Validity

User Data

Channel Status Data

Parity Bit

Figure 11. CS8411 Status Register Flag Timing

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