CONFIDENTIAL
PRELIMINARY
CYNSE10512
CYNSE10256
CYNSE10128
Document #: 38-02069 Rev. *F
Page 90 of 153
• In MultiSearch Mode, there is a separate set of the LHO and LHI signals corresponding to memory array 0 and array 1.
LHO_0[1:0] and LHI_0[6:0] corresponds to array 0 whereas LHO_1_L[1:0] and LHI_1_L[6:0] corresponds to array 1. The latter
share the same pins as FULO[1:0] and FULI[6:0] respectively.
• Both LHO_0[1] and LHO_0[0] are exact same signals so that the loads can be shared by two outputs. The same is true for
LHO_1_L[1] and LHO_1_L[0].
• Unused LHI_0 signals should be tied to ground whereas unused LHI_1_L signals should be tied to VDDQ_ASIC, which is either
1.8V or 2.5V only.
• LHI_1_L signals are active LOW while LHI_0 are active HIGH.
The hardware diagram of the MultiSearch subsystem of up to eight devices is shown in Figure 6-14. The MultiSearch Enable
(MSE) bit in the Command Register must be set HIGH to perform multi search. The same with Enhanced Mode (EMODE) bit.
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).
• NES (in the Block Mini-Key Register) field in each block of all devices must be set to “11” (binary) to make a 576-bit table.
For a single-device configuration, all parameters will be the same as device 7. BHI[2:0] and all LHI should be tied to ground.
Notes:
• 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 allows 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 6-10. For these timing diagrams, three 576-bit searches are performed sequentially. Figure 6-
35 shows the timing diagram for a MultiSearch command in the 576-bit-configured table of eight devices for device number 0.
Figure 6-36 and Figure 6-37 shows the same for device number 1 and number 7 (the last device in this specific table) respectively.
Table 6-10. Hit/Miss Assumptions for 576-bit Multi Search
Search Number
1
2
3
Device 0
Hit
Hit
Miss
Miss
Miss
Miss
Device 1
Miss
Miss
Hit
Miss
Miss
Miss
Devices 2–6
Miss
Miss
Miss
Miss
Miss
Miss
Device 7
Miss
Miss
Miss
Hit
Miss
Miss
[+] Feedback
[+] Feedback
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
