CS8401A-CS datasheet(14/34 Pages) ETC

14 / 34 page

mode 0, and are read 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.

Similar to mode 0, transmitted channel status

data will be the same for channel A and chan-

nel B (one channel status bit per frame). Flag 1

and flag 2 can be used to monitor this buffer.

Flag 1 is set low when byte 0 of channel status

data, location 08H, is read and is toggled when

every other byte is read. As shown in Figure 13,

flag 2 is set high when byte 0, location 08H, is

read and set low when byte 4, location 0CH, is

read. Flag 2 determines whether the channel

status pointer is reading the first four-byte sec-

tion or the second four-byte section, while flag 1

indicates which two bytes of the section are free

to update.

The auxiliary data buffer, locations 10H to 1FH,

is read in a cyclic manner similar to the data

buffer; however, four auxiliary data bits are

transmitted per audio sample (sub-frame). Since

the auxiliary buffer must be read four times as

often as the user data buffer and is four times as

large, flag 0 can be used to monitor both.

Buffer Mode 2

In buffer mode 2, two 8-byte buffers are avail-

able for buffering both channel A and channel B

channel status data independently. Both buffers

are identical to the channel status buffer in

mode 1 except that each channel can have

unique channel status data. The two buffers are

read simultaneously with locations 08H to 0FH

transmitted in channel A and locations 10H to

17H transmitted in channel B. Figure 5 contains

the buffer memory modes and Figure 14 illus-

trates the buffer read sequence for mode 2.

Flag 0

Flag 1

Flag 2

(Expanded)

Block

(384 Audio Samples)

0B 0C

0F 08

C.S. Address

123

5678

C.S. Byte

Flag 0

C.S. Address

User Address

(Addresses are in Hex)

0F 0C

13,14

17 18

1B,1C

1F 10

13,14

17 18

1B,1C

Flag 1

Aux. Address

Figure 13. CS8401A Buffer Memory Read Sequence - MODE 1

CS8401A

DS60F1

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