CYNSE70256-66BHC Cypress Semiconductor Corp, CYNSE70256-66BHC Datasheet - Page 48

• Manufacturer Part Number: CYNSE70256-66BHC
• Manufacturer: Cypress Semiconductor Corp

Specifications of CYNSE70256-66BHC

• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Package Type: BGA
• Mounting: Surface Mount
• Lead Free Status / Rohs Status: Not Compliant

10.6.4
The hardware diagram of the Search subsystem of fifteen devices is shown in Figure 10-29. Each of the four blocks in the diagram
represents a block of four CYNSE70256 devices (except the last, which has three devices). The diagram for a block of four
devices is shown in Figure 10-30. The following are the parameters programmed into the fifteen devices.
The timing diagrams referred to in this paragraph reference the Hit/Miss assumptions defined in Table 10-19. For the purpose of
illustrating the timings, it is further assumed that the there is only one device with a matching entry in each of the blocks. Figure 10-
31 shows the timing diagram for a Search command in the 144-bit-configured table (fifteen devices) for each of the four devices
in block number 0. Figure 10-32 shows the timing diagram for a Search command in the 144-bit-configured table (fifteen devices)
for all the devices above the winning device in block number 1. Figure 10-33 shows the timing diagram for the globally winning
device (the final winner within its own and all blocks) in block number 1. Figure 10-34 shows the timing diagram for all the devices
below the globally winning device in block number 1. Figure 10-35, Figure 10-36, and Figure 10-37 show the timing diagrams of
the devices above globally winning device, the globally winning device, and the devices below the globally winning device,
respectively, for block number 2. Figure 10-38, Figure 10-39, Figure 10-40, and Figure 10-41 show, respectively, the timing
diagrams of the devices above the globally winning device, the globally winning device, and devices below the globally winning
device except the last device (device 14), and then the last device (device 14) for block number 3.
The 144-bit Search operation is pipelined and executes as follows. In the fifth cycle after the Search command, the devices in a
block (being less than or equal to four devices resolving the winner within them using the LHI[6:0] and LHO[1:0] signalling
mechanism) arbitrate for a winner among them. In the sixth cycle after the Search command, the blocks (of devices) resolve the
winning block through the BHI[2:0] and BHO[2:0] signalling mechanism. The winning device in the winning block is the global
winning device for a Search operation.
Table 10-19. Hit/Miss Assumptions
Document #: 38-02035 Rev. *E
Note:
17. All fifteen devices must be programmed with the same value of TLSZ and HLAT. Only the last bank of the last device in the table must be programmed with
• First fourteen devices (devices 0–13, Bank 0 and 1): CFG = 0101010101010101, TLSZ = 10, HLAT = 001, LRAM = 0, and
• Fifteenth device (device 14, Bank 0): CFG = 0101010101010101, TLSZ = 10, HLAT = 001, LRAM = 0, and LDEV = 0.
• Fifteenth device (device 14, Bank 1): CFG = 0101010101010101, TLSZ = 10, HLAT = 001, LRAM = 1, and LDEV = 1.
LDEV = 0.
LRAM = 1 and LDEV = 1 (device number 30 in this case).
Search Number
144-bit Search on Tables Configured as ×144 using up to Fifteen CYNSE70256 Devices
Block 0
Block 1
Block 2
Block 3
Miss
Miss
Miss
Hit
1
Miss
Miss
Hit
Hit
2
Miss
Miss
Hit
Hit
3
CYNSE70256
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Miss
Miss
Miss
Miss
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