cynse70032 Cypress Semiconductor Corporation., cynse70032 Datasheet - Page 32

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

The timing diagrams referred to in this paragraph reference the Hit/Miss assumptions defined in Table 13-6. For the purpose of
illustrating timings, it is further assumed that the there is only one device with a matching entry in each of the blocks. Figure 13-11
shows the timing diagram for a Search command in the 68-bit-configured table of 31 devices for each of the eight devices in block
number 0. Figure 13-12 shows a timing diagram for a Search command in the 68-bit-configured table of 31 devices for all the
devices in block number 1 (above the winning device in that block). Figure 13-13 shows the timing diagram for the globally winning
device (defined as the final winner within its own and all blocks) in block number 1. Figure 13-14 shows the timing diagram for
all the devices below the globally winning device in block number 1. Figure 13-15, Figure 13-16, and Figure 13-17, respectively,
show the timing diagrams of the devices above the globally winning device, the globally winning device, and the devices below
the globally winning device for block number 2. Figure 13-18, Figure 13-19, Figure 13-20, and Figure 13-21, respectively, show
the timing diagrams of the devices above the globally winning device, the globally winning device, and the devices below the
globally winning device except the last device (device 30) for block number 3.
The 68-bit Search operation is pipelined and executed as follows. Four cycles from the Search command, each of the devices
knows the outcome internal to it for that operation. In the fifth cycle after the Search command, the devices in a block arbitrate
for a winner amongst them (a “block” being defined as less than or equal to eight devices resolving the winner between them
using the LHI[6:0] and LHO[1:0] signalling mechanisms). In the sixth cycle after the Search command, the blocks resolve the
winning block through the BHI[2:0] and BHO[2:0] signalling mechanisms. The winning device within the winning block is the global
winning device for a Search operation.
Table 13-6. Hit/Miss Assumption
Document #: 38-02042 Rev. *E
Search Number
Block 0
Block 1
Block 2
Block 3
SSF, SSV
DQ[67:0]
CMD[8:0], CMDV
Figure 13-9. Hardware Diagram for a Table with 31 Devices
Miss
Miss
Miss
Hit
1
Block of 8 CYNSE70032s Block 2 (devices 16–23)
Block of 7 CYNSE70032s Block 3 (devices 24–30)
Block of 8 CYNSE70032s Block 1 (devices 8–15)
Block of 8 CYNSE70032s Block 0 (devices 0–7)
BHO[2]
BHO[2]
BHI[2]
BHO[2]
BHO[2]
BHI[2]
BHI[2]
BHI[2]
Miss
Miss
Hit
Hit
BHO[1]
BHO[1]
2
BHI[1]
BHO[1]
BHO[1]
BHI[1]
BHI[1]
BHI[1]
BHO[0]
BHO[0]
BHO[0]
BHO[0]
BHI[0] GND
BHI[0]
BHI[0]
BHI[0] GND
Miss
Miss
Hit
Hit
3
GND
SRAM
CYNSE70032
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Miss
Miss
Miss
Miss
4