CYNSE70256-66BHC Cypress Semiconductor Corp, CYNSE70256-66BHC Datasheet - Page 25

• 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
This subsection describes the following.
10.6.1
The hardware diagram of the Search subsystem of four devices is shown in Figure 10-5. The following are the parameters
programmed into each bank of the the four devices.
Figure 10-6 shows the timing diagram for a Search command in the 72-bit-configured table of four devices for device number 0.
Figure 10-7 shows the timing diagram for a Search command in the 72-bit-configured table of four devices for device number 1.
Figure 10-8 shows the timing diagram for a Search command in the 72-bit-configured table of four devices for device number 7
(the last device in this specific table). For these timing diagrams four 72-bit searches are performed sequentially. HIT/MISS
assumptions were made as shown below in Table 10-10.
Table 10-10. Hit/Miss Assumptions
Note:
Document #: 38-02035 Rev. *E
15. Each bank of the four devices must be programmed with the same values for TLSZ and HLAT. Only the the last bank of the last device in the table (device
• 72-bit search on tables configured as ×72 using up to four devices
• 72-bit search on tables configured as ×72 using up to fifteen devices
• 144-bit search on tables configured as ×144 using up to four devices
• 144-bit search on tables configured as ×144 using up to fifteen device
• 288-bit search on tables configured as ×288 using up to four devices
• 288-bit search on tables configured as ×288 using up to fifteen devices
• Mixed-size search on tables configured with different widths using an CYNSE70256 with CFG_L LOW
• Mixed-size searches on tables configured with different widths using an CYNSE70256 with CFG_L HIGH.
• First three devices (devices 0–2, both banks): CFG = 0000000000000000, TLSZ = 01, HLAT = 010, LRAM = 0, and LDEV = 0.
• Fourth device (device 3, Bank 0): CFG = 0000000000000000, TLSZ = 01, HLAT = 010, LRAM = 0, and LDEV = 0
• Fourth device (device 3, Bank 1): CFG = 0000000000000000, TLSZ = 01, HLAT = 010, LRAM = 1, and LDEV = 1.
number 3 in this case) must be programmed with LRAM = 1 and LDEV = 1.
Search Number
CMDV
CMD[10:0]
SSF, SSV
DQ[71:0]
Search Command
72-bit Search on Tables Configured as ×72 using up to Four CYNSE70256 Devices
Device 0
Device 1
Device 2
Device 3
Figure 10-5. Hardware Diagram for a Table with Four Devices
BHI[2:0]
BHI[2:0]
BHI[2:0]
BHI[2:0]
Miss
Miss
Miss
Hit
1
CYNSE70256 #2
CYNSE70256 #3
CYNSE70256 #0
CYNSE70256 #1
Miss
Miss
Miss
Hit
2
0
0
0
0
LHO[1]
LHO[1]
1
1
1
1
LHO[1]
2
2
2
2
LHI
LHI
LHI
LHI
LHO[1]
LHO[0]
3
3
3
3
LHO[0]
4
4
4
4
Miss
LHO[0]
Hit
Hit
Hit
3
5
5
5
5
LHO[0]
6
6
6
6
CYNSE70256
BHO[0]
BHO[1]
BHO[2]
[15]
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Miss
Miss
Miss
SRAM
Hit
4