CYNSE10128-083FGCI CYPRESS [Cypress Semiconductor], CYNSE10128-083FGCI Datasheet - Page 36

• Manufacturer Part Number: CYNSE10128-083FGCI
• Manufacturer: CYPRESS [Cypress Semiconductor]

5.4.13
The SRR register is only active when the device is in the Enhanced mode. It contains status information about where the next-
free entry is and what kind of entry it is. There are sixteen SRRs; one SRR associated with one CMPR. The SSR is updated on
a Search operation regardless of hit or miss. Two SRRs are used in one Search operation when MSE is set. The second SRR
is automatically selected to be the register one index higher. Table 5-14 below details the SRR fields.
Table 5-14. Search Result Register
Table 5-15 below shows the different parts of the INDEX field of the SRR.
Table 5-15. SRR’s INDEX Composition Based on STATUS
Document #: 38-02069 Rev. *F
Hit
Free Entry
Free Sub-block
Free Block
Taken
PRIORITY
Mini-Key
STATUS
INDEX
Field
FLG
STATUS
Search Result Register (SRR[15:0])
71
(decimal)
[31:24]
[39:32]
[43:40]
[62:44]
[71:64]
[23:M]
Index
[N:0]
[63]
63
Initial Value
(binary)
INDEX[17:11]
55
Undefined
Block ID
Block ID
Block ID
Block ID
0
0
0
0
0
Index. This field contains the Hit or Miss index inside the Core. N = 17 for
CYNSE10512, 16 for CYNSE10256, 15 for CYNSE10128.
Reserved. M = 18 for CYNSE10512, 17 for CYNSE10256, 16 for CYNSE10128.
Mini-Key. This field contains a copy of the Mini-Key value selected for the Search
operation. The value comes from the selected CPR.
Soft Priority. This field holds the priority value of the sub-block where a successful
search occurs. Otherwise it holds the priority of the next-free entry sub-block. If there
are no free entries, this field is set to the selected CPR’s Soft Priority value. This
field is not valid when STATUS value is Taken.
Next-free Entry Status. This field contains the status information for the next-free
entry.
The STATUS value is encoded as described below:
0000: Single match. Search hit and there is a single match.
0010: Single free entry. Search miss and there is a single free entry.
0100: Single free sub-block. Search miss and there is a single free sub-block.
0110: Single free block. Search miss and there is a single free block.
0001: Multiple matches. Search hit and there are multiple matches.
0011: Multiple free entries. Search miss and there are multiple free entries
0101: Multiple free sub-blocks. Search miss and there are multiple free sub-blocks.
0111: Multiple free blocks. Search miss and there are multiple free blocks.
1000: Taken. Search miss and there are no free entries.
Reserved.
Flag. When set to 1, this flag indicates that a Search operation resulted in a miss,
this device has a free entry and the upstream devices in a cascade have a Search
miss with no free entries reported. Note that a device with no free entries can still
have free blocks or sub-blocks.
Reserved.
Figure 5-21. Search Result Register
47
CONFIDENTIAL
PRELIMINARY
39
PRIORITY
INDEX[10:9]
Sub-block ID
Sub-block ID
Sub-block ID
Undefined
N = 16 for CYNSE10256
31
All zeros
Mini-Key
Description
23
Hit Entry Index
Free Entry Index
All zeros
All zeros
Undefined
15
N = 17 for CYNSE10512
N = 15 for CYNSE10128
INDEX
INDEX[8:0]
CYNSE10512
CYNSE10256
CYNSE10128
7
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