M7040N datasheet(21/159 Pages) STMICROELECTRONICS

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M7040N

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 signal for the depth-

cascaded block. For more information, see

DEPTH-CASCADING, page 124 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” Signal, page 124.

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 search engines in the system.

On a broadcast read-only, the device with the

LDEV bit set to '1' responds.

Chip Core Supply (VDD). This is equal to 1.5V.

Chip I/O Supply (VDDQ). This is equal to either

2.5 or 3.3V.

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

Port’s Test Reset.

CLOCKS

If the CLK_MODE pin is low, M7040N receives the

CLK2X and PHS_L signals. It uses the PHS_L sig-

nal to divide CLK2X and generate an internal clock

(CLK), as shown in Figure 10. The M7040N uses

CLK2X and CLK for internal operations. If the

CLK_MODE pin is high, the M7040N receives the

CLK1X only. the M7040N uses an internal PLL to

double the frequency of CLK1X and then divides

that clock by two to generate a CLK for internal op-

erations, as shown in Figure 11.

Note: For the purpose of showing timing dia-

grams, all such diagrams in this document will be

shown in CLK2X mode. For a timing diagram in

CLK1X mode, the following substitution can be

made (see Figure 12).

Figure 10. Clocks (CLK2X and PHS_L)

Note: Any reference to “CLK Cycles” means 1 cycle of the signal, “CLK.”

1. “CLK” is an internal signal.

Figure 11. Clocks (CLK1X)

1. “CLK” is an internal signal.

CLK2X

PHS_L

CLK

(1)

AI04750

CLK1X

CLK

(1)

AI04665

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