M7010R Просмотр технического описания (PDF) - STMicroelectronics

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M7010R

16K x 68-bit Entry NETWORK SEARCH ENGINE

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M7010R

Address Latch Enable (ALE_L). When this sig-

nal is low, the addresses on the SRAM address

bus have been validated. When more than one de-

vice is cascaded, the ALE_L of all devices must be

connected.

Local Hit In (LHI[6:0]). These pins depth-cas-

cade the device to form a larger table size. One

signal of this bus is connected to the LHO[1] or

LHO[0] of each of the upstream devices in a block.

Connect all unused LHI pins to a logic '0.' (For

more information, see DEPTH-CASCADING,

page 52.)

Local Hit Out (LHO[1:0]). LHO[1] and LHO[0]

are the same logical signal. LHO[1] or LHO[0] is

connected to one input of the LHI bus of up to four

downstream devices (in a block that contains up to

eight devices; for more information, see DEPTH-

CASCADING, page 52.)

Block Hit In (BHI[2:0]). Inputs from the previous

BHO[2:0] are tied to the BHI[2:0] of the current de-

vice (see DEPTH-CASCADING, page 52). In a

four-block system, the last block can contain only

seven devices because the ID code 11111 is used

for broadcast access.

Block Hit Out (BHO[2:0]). Outputs from the cur-

rent device are connected to the BHI[2:0] of the

next device (see DEPTH-CASCADING, page 52).

Full In (FULI[6:0]). Each signal in this bus is con-

nected to FULO[0] or FULO[1] of an upstream de-

vice to generate the FULL flag for the depth-

cascaded block. For more information, see

DEPTH-CASCADING, page 52 to Generate Full

for a Block Section.

Full Out (FULO[1:0]). FULO[1] and FULO[0] are

the same logical signal. One of these two signals

must be connected to the FULI of up to four down-

stream devices in a depth-cascaded table. Bit [0]

in the data array indicates if the entry is full (1) or

empty (0).This signal is asserted if all of the bits in

the data array are '1s.' Refer to Depth-Cascading

to Generate a “FULL” State for a Block, page 52.

Full Flag (FULL). When asserted, this signal in-

dicates that the table consisting of many depth-

cascaded devices is full.

Device Identification (ID[4:0]). The binary-en-

coded device ID for a depth-cascaded system

starts at 00000 and goes up to 11110. 11111 is re-

served for a special broadcast address that se-

lects all cascaded (silicon) Search Engines in the

system. On a broadcast read-only, the device with

the LDEV Bit set to '1' responds.

Test Data In (TDI). This is the Test Access Port’s

Test Data In.

Test Clock (TCK). This is the Test Access Port’s

Test Clock.

Test Data Out (TDO). This is the Test Access

Port’s Test Data Out.

Test Mode Select (TMS). This is the Test Ac-

cess Port’s Test Mode Select.

Test Reset (TRST_L). This is the Test Access

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