SAA2501 Datasheet, PDF (27/52 Pages) NXP Semiconductors – Digital Audio Broadcast DAB decoder

Philips Semiconductors
Digital Audio Broadcast (DAB) decoder
Preliminary specification
SAA2501
Table 20 Example of a 2 byte data item
L3DATA⁽¹⁾
01100010
CCCCCCCC
01100011
SSSSSSSS
01100001
DDDDDDDD
01100011
SSSSSSSS
01100001
DDDDDDDD
TRANSFER
SOURCE
host
host
host
SAA2501
host
SAA2501
host
SAA2501
host
SAA2501
L3MODE
0
1
0
1
0
1
0
1
0
1
Note
1. Explanation of bytes:
a) CCCCCCCC = control byte.
b) SSSSSSSS = status byte.
c) DDDDDDDD = data byte.
EXPLANATION
indicates ‘write control’ transfer
write transfer initiating (type I) control byte
indicates ‘read status’ transfer
read status (repeat step 4 until L3RDY = 1)
indicates ‘read item data’ transfer
read first item data byte
indicates ‘read status’ transfer
read status (repeat step 8 until L3RDY = 1)
indicates ‘read item data’ transfer
read second item data byte
Each data item has its own length in bytes. It is allowed to transfer less bytes than the data item length, skipping the last
one or more bytes (it is even allowed to transfer no bytes at all). It is not allowed to transfer more bytes than the item
length. This restriction does not hold for the APU coefficient item. After writing all APU coefficients (i.e. after writing all
APU coefficient item bytes), they may be rewritten by continuing writing bytes to the APU coefficient item. Writing more
than the specified number of bytes to a writeable data item or writing bytes to a read-only data item may cause the
SAA2501 to malfunction. The reading of a write-only data item yields irrelevant data.
January 1995
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