cynse70032 Cypress Semiconductor Corporation., cynse70032 Datasheet - Page 76

• Manufacturer Part Number: cynse70032
• Description: Network Search Engine
• Manufacturer: Cypress Semiconductor Corporation.

The logical 272-bit Search operation is shown in Figure 13-52. The entire table of 272-bit entries is compared to a 272-bit word
K that is presented on the DQ bus in cycles A, B, C, and D of the command using the GMR and the local mask bits. The GMR is
the 272-bit word specified by the two pairs of GMRs selected by the GMR Indexes in the command’s cycles A and C in each of
the eight devices. The 272-bit word K that is presented on the DQ bus in cycles A, B, C, and D of the command is compared to
each entry in the table starting at location 0. The first matching entry’s location address L is the winning address that is driven as
part of the SRAM address on the SADR[21:0] lines (see “SRAM Addressing” on page 98).
going to be a location 0 in a four-entry page for 272-bit Search (two LSBs of the matching index will be 00).
The Search command is a pipelined operation and executes a Search at one-fourth the rate of the frequency of CLK2X for 272-bit
searches in ×272-configured tables. The latency of SADR, CE_L, ALE_L, WE_L, SSV, and SSF from the 272-bit Search
command (measured in CLK cycles) from the CLK2X cycle that contains the C and D cycles is shown in Table 13-20.
Table 13-20. Search Latency from Instruction to SRAM Access Cycle
Search latency from command to SRAM access cycle is 5 for only a single device in the table and TLSZ = 01. In addition, SSV
and SSF shift further to the right for different values of HLAT, as specified in Table 13-21.
Table 13-21. Shift of SSF and SSV from SADR
13.9
The hardware diagram of the search subsystem of 31 devices is shown in Figure 13-53. Each of the four blocks in the diagram
represents a block of eight CYNSE70032 devices, except the last which has seven devices. The diagram for a block of eight
devices is shown in Figure 13-54. The following are the parameters programmed into the 31 devices.
Document #: 38-02042 Rev. *E
• First thirty devices (devices 0–29): CFG = 10101010, TLSZ = 10, HLAT = 000, LRAM = 0, and LDEV = 0.
• Thirty-first device (device 30): CFG = 10101010, TLSZ = 10, HLAT = 000, LRAM = 1, and LDEV = 1.
Number of Devices
1–31 (TLSZ = 10)
1–8 (TLSZ = 01)
1 (TLSZ = 00)
272-bit Search on Tables Configured as ×272 using up to 31 CYNSE70032 Devices
HLAT
000
001
010
100
101
011
110
111
131068
Location
address
GMR
12
K
0
4
8
L
271
271
Figure 13-52. x272 Table with Eight Devices
Max Table Size
124K × 272 bits
32K × 272 bits
4K × 272 bits
A
0
(272-bit configuration)
CFG = 10101010
B
1
C
2
Number of CLK Cycles
D
3
0
1
2
3
4
5
6
7
0
0
Latency in CLK Cycles
Must be same in each of the eight
Note
. The matching address is always
(First matching entry)
4
5
6
devices
CYNSE70032
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