Motorola DSP96002 - Manual (Page 805)

MOTOROLA 23
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