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CYNSE10512 Datasheet(PDF) 56 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) 56 Page - Cypress Semiconductor

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CONFIDENTIAL
PRELIMINARY
CYNSE10512
CYNSE10256
CYNSE10128
Document #: 38-02069 Rev. *F
Page 56 of 153
6.5
Search Command
One of the key parameters that controls SEARCH operation is TLSZ (Statically programmed in Command Register). TLSZ
controls the maximum number of devices that can be cascaded and the latency of SEARCH instruction, as shown in Table 6-4.
The following is a list of SEARCH operations described in the data sheet:
• Mixed-size Single Search for a single device on tables configured with different widths (TLSZ[1:0] = 01)
• Mixed-size MultiSearch for a single device on tables configured with different widths (TLSZ[1:0] = 01)
• 72-bit Single Search for single device or cascade up to eight devices (TLSZ[1:0] = 01)
• 72-bit MultiSearch for single device or cascade up to eight devices (TLSZ[1:0] = 01)
• 144-bit Single Search for cascade up to 31 devices (TLSZ[1:0] = 10)
• 576-bit Single Search for single device or cascade up to eight devices (TLSZ[1:0] = 01)
• 576-bit MultiSearch for single device or cascade up to eight devices (TLSZ[1:0] = 01)
• Mixed-size Single Search for cascade up to 31 devices on tables configured with different widths (TLSZ[1:0] = 10)
• Mixed-size MultiSearch for cascade up to eight devices on tables configured with different widths (TLSZ[1:0] = 01).
6.5.1
Mixed-size Single Searches with One Device on Tables Configured with Different Widths
This subsection covers single-searches with a single device configured with tables of different widths (×72, ×144, ×288). Figure 6-5
shows three sequential searches: first, a 72-bit Search on a ×72-configured table; a 144-bit Search on a ×144-configured table;
and a 288-bit Search on a ×288-configured table that each results in a hit. Figure 6-6 shows the sample table.
Note: If the mixed-size tables include a 576-bit table, then the device can only operate in the Enhanced Mode, as the maximum
table width allowed in the Non-Enhanced Mode is 288 bits.
One way to create multiple tables of different widths in an NSE is by having table designation bits. It is assumed that bits [71:70]
for each entry will be assigned such table designation bits. DQ[71:70] will be 00 in each of the two A and B cycles of the ×72-bit
Search (Search1). DQ[71:70] is 01 in each of the A and B cycles of the ×144-bit Search (Search2). DQ[71:70] is 10 in each of
the A, B, C, and D cycles of the ×288-bit Search (Search3).
Table 6-4. TLSZ[1:0] Description
TLSZ[1:0]
Max. Number of Devices
Allowed in a Cascaded
NSEs
SEARCH Latencies (CLK1X Cycles)
Max. Table Size (With Max. Number of
Devices
00
Not Supported
Not Applicable
Not Applicable
01
8
5
N x 72
N/2 x 144
N/4 x 288
N/8 x 576
N = 2048K for CYNSE10512, 1024K for
CYNSE10256, 512K for CYNSE10128
10
31 (in single-search mode, 8 in
multisearch mode)
6N x 72
N/2 x 144
N/4 x 288
N/8 x 576
N = 7936K for CYNSE10512, 3968K for
CYNSE10256, 1984K for CYNSE10128
11
Reserved
Reserved
Reserved
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