CONFIDENTIAL
PRELIMINARY
CYNSE10512
CYNSE10256
CYNSE10128
Document #: 38-02069 Rev. *F
Page 85 of 153
6.5.6
576-bit Single Search for One Device or Cascade up to Eight Devices
The hardware diagram of the Search subsystem of up to eight devices is shown in Figure 6-9. The MultiSearch Enable (MSE)
bit in the Command Register must be set LOW to perform single-search. The following are the rest of the parameters programmed
into the eight devices.
• First seven devices (devices 0–6): TLSZ = 01 (binary), HLAT = 000 (binary), LRAM = 0 (binary), and LDEV = 0 (binary).
• Eighth device (device 7): TLSZ = 01 (binary), HLAT = 000 (binary), LRAM = 1 (binary), and LDEV = 1 (binary).
• 576-bit search is only available in the Enhanced Mode, not in the Non-Enhanced Mode. NES should be set to “11” (binary) in
all blocks of all devices to create a 576-bit table.
For a single-device configuration, all parameters will be the same as device 7. BHI[2:0] and LHI[6:0] should be tied to ground.
Notes:
• All eight devices must be programmed with the same values for TLSZ and HLAT. Only the last device in the table (device
number 7 in this case) must be programmed with LRAM = 1 (binary) and LDEV = 1 (binary). All other upstream devices
(devices 0 through 6 in this case) must be programmed with LRAM = 0 (binary) and LDEV = 0 (binary).
• The device receiving all the LHO signals from the other devices is considered the last device.
• All the shared signals in the following timing diagrams showing tri-stated condition (“z”) indicate that, that particular device is
not driving the shared signals. The shared signals are not three-stated in a real life because other devices will be driving them.
• Comparing the hardware diagrams shown in Figure 6-9 and Figure 6-14, enabling MultiSearch does not mean that a board
layout change is required. The LHO_1_L and LHI_1_L share the same pin with the Full In and Full Out signals, which are not
shown in Figure 6-9. Cascading multiple devices together still allow the user to configure the devices through software to
perform single-search or MultiSearch operations without any board change.
The following three figures show the response of three of the eight devices having a hit at different time according to a Hit/Miss
assumption shown below in Table 6-9. For these timing diagrams, three 576-bit searches are performed sequentially. Figure 6-
31 shows the timing diagram for a Search command in the 576-bit-configured table of eight devices for device number 0. Figure 6-
32 and Figure 6-33 shows the same for device number 1 and number 7 (the last device in this specific table) respectively.
Table 6-9. Hit/Miss Assumptions
Search Number
1
2
3
Device 0
Hit
Miss
Miss
Device 1
Miss
Hit
Miss
Devices 2–6
Miss
Miss
Miss
Device 7
Miss
Miss
Miss
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