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Motorola DSP96002 User Manual

Page 805

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MOTOROLA

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tors could be “least recently used” although they can not be replaced. Therefore, the “next
to be replaced sector” is the only sector whose lru bit is set and lock bit cleared. The ex-
ception to this rule is the case where all of the eight sectors are locked and designated as
“least recently used”, in which case there is no “next to be replaced sector” because no
sector will be replaced until at least one sector is unlocked.

TAG number 0

0

31

msb

lsb

0

0

7

6

TAG number 1

msb

lsb

0

0

TAG number 2

msb

lsb

0

0

TAG number 3

msb

lsb

0

0

TAG number 4

msb

lsb

0

0

TAG number 5

msb

lsb

0

0

TAG number 6

msb

lsb

0

0

TAG number 7

msb

lsb

0

0

lock

lock 0

0

0

0

1

7

7

lru

lru

lru

LRU/LOCK status

31

30

29

16

17

15

0

lock

1

28

Figure 4 - Circular Tags Buffer