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CYNSE10512 Datasheet(PDF) 39 Page - Cypress Semiconductor

Part # CYNSE10512
Description  Ayama??10000 Network Search Engine
Download  153 Pages
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Manufacturer  CYPRESS [Cypress Semiconductor]
Direct Link  http://www.cypress.com
Logo CYPRESS - Cypress Semiconductor

CYNSE10512 Datasheet(HTML) 39 Page - Cypress Semiconductor

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CONFIDENTIAL
PRELIMINARY
CYNSE10512
CYNSE10256
CYNSE10128
Document #: 38-02069 Rev. *F
Page 39 of 153
5.4.16
Block Parity Register (BPAR)
The BPAR is only accessible when the device is in the Enhanced mode. There is one BPAR for each block in the device. Table 5-
18 shows the BPR fields.
5.4.17
Block NFA Register (BNFA)
The BNFA is only accessible when the device is in the Enhanced mode. There is one BNFA for each block in the device. Table 5-
19 shows the BNFA fields.
Table 5-18. Block Parity Register Description
Field
Range
(decimal)
Initial Value
(binary)
Description
PERR
[3:0]
0000
Parity Error. This field contains the status of a Parity operation. It is set to 1 when any parity
error is detected during the Parity operation on the associated block. Each bit corresponds
to one of the four x72 entries checked during the Parity operation. Bit[0] corresponds to the
lowest address. This field is sticky, i.e., it can only be cleared by a user write to the register.
This field contains only this block’s status. To clear this bit, the user must write a “1” to this
bit location. Writing a “0” will preserve the old value.
[30:4]
Reserved.
EN
[31]
0
Enable Parity Checking. This field enables parity checking for the associated block. When
set to 1, the associated block will participate in Parity operation.
[71:32]
Reserved.
Table 5-19. Block NFA Register Description
Field
Range
(decimal)
Initial Value
(binary)
Description
NFA3
[8:0]
0
Next-free Address for Sub-block #3. This field contains the address/index of the next-
free entry within the sub-block of the block associated with this register. If the entry size is
larger than x72, the least significant bits will be set to 0 as follows:
x144: NFAx[0] = ‘0’,
x288: NFAx[1:0] = “00”,
x576: NFAx[2:0] = “000”.
[13:9]
Reserved.
MULTI3
[14]
1
Multiple Free Entries in Sub-block #3. This field contains the multiple free entry status.
If there are multiple free entries in the sub-block, this bit is set to 1.
F3
[15]
0
Free Entry in Sub-block #3. This field indicates the sub-block full status. If this field is set
to 1, the sub-block is full and there are no free entries. If the field is set to 0, the sub-block
is not full and there is a free entry.
NFA2
[24:16]
0
Next-free Address for Sub-block #2. See NFA3 description.
[29:25]
Reserved.
MULTI2
[30]
1
Multi Free Entry in Sub-block #2. See MULTI3 description.
F2
[31]
0
Free Entry in Sub-block #2. See F3 description.
7
15
23
0
39
47
55
31
63
71
Figure 5-24. Block Parity Register
7
15
23
0
39
47
55
31
63
71
NFA3
NFA2
NFA1
NFA0
Figure 5-25. Block NFA Register
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