User`s guide

Elan Digital Systems Ltd. 37 AD125 USER’S GUIDE
4.8 CTLEN (IR 9)
BIT FUNCTION
RESET
STATE
WRITE READ
0 CTLEN0 0
1 CTLEN1 0
2 CTLEN2 0
3 CTLEN3 0
4 CTLEN4 0
5 CTLEN5 0
6 CTLEN6 0
7 0
7-BIT VALUE TO CONTROL
ACTIVE LENGTH OF READ AND
WRITE POINTERS. ALSO USED
TO FORCE A PARTIAL RESET
OF BOTH READ AND WRITE
POINTERS. BIT-MAPPED: 0x7F
SETS 15-BIT, 0x3F-14, 0x1F-13,
0x0F-12, 0x07-11, 0x03-10, 0x01-9,
0x00-8-BIT. MUST BE 15-BIT
FOR FIFO MODE.
4.9 DECR (IR D)
BIT FUNCTION
RESET
STATE
WRITE READ
0 X X -
1 X X -
2 X X -
3 X X -
4 X X -
5 X X -
6 X X -
7 X X -
ANY READ OR WRITE ACCESS TO THIS PORT WILL DECREMENT
THE READ POINTER BY ONE.