MU9C4320L datasheet(6/32 Pages) MUSIC

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MU9C4320L ATMCAM

Pin Descriptions

Rev. 3

/FF (Full Flag, Output)

The /FF output indicates when all the memory locations

have their Validity bits set valid (LOW). When there is at

least one location with its Validity bit set HIGH, the /FF

output will be HIGH; when all locations have their

Validity bits set LOW, and the /FI input is LOW, the /FF

output will be LOW. If the /FI input is HIGH, the /FF

output will be HIGH. The state of the /FF line will not

change until after the rising edge of /E during a Write

cycle.

/FI (Full Input, Input)

The /FI input receives full information from the next

higher-priority ATMCAM in a vertically cascaded system

to provide system-level full information. When the /FI

input is LOW the /FF output will be HIGH if there is at

least one location whose Validity bit is set invalid; when

all locations have their Validity bits set valid, the /FF

output goes LOW. When the /FI input is HIGH, the /FF

output will remain HIGH. The /FF output from one device

is connected to the /FI input of the next lower-priority

device to give system-full indication. The /FI pin of the

highest-priority device must be tied LOW.

/MM (Multiple Match, Open Drain Output)

The /MM line indicates that there is a multiple match

within the system. When the /MI input is HIGH, the /MM

line is pulled LOW if there are at least two matches within

the ATMCAM as a result of the previous Comparison

cycle; when there are less than two matches, the /MM line

floats HIGH. When the /MI input is LOW, the /MM line is

pulled LOW if there are one or more matches within the

ATMCAM as a result of the previous Comparison cycle;

when there are no matches, the /MM line floats HIGH.

The /MM lines have open-drain outputs, so all /MM lines

within the system are connected together to give

system-level multiple match indication. The state of the

/MM line will not change until after the rising edge of /E

during a Comparison cycle. The /MM line is unaffected by

matches in the VP Table.

/MV (Match Valid, Output)

After a Compare cycle, the /MV line indicates whether

there has been a valid match in this device in either the

CAM array or the VP Table. When /MV is LOW then a

match has occurred in either the CAM array or the VP

Table; when /MV is HIGH then a mismatch has occurred

in both the CAM array and the VP Table. The /MF output

is used to distinguish between the two types of matches.

The state of the /MV line will not change until after the

rising edge of /E during a Comparison cycle. /MV

represents local conditions written in the device; it is not

conditioned by the /MI input.

/RESET

The /RESET input is used to reset the ATMCAM to a

known state. When the /RESET line is pulled LOW it

causes the ATMCAM to enter its reset state. After power

is applied to the ATMCAM, the /RESET line must be held

LOW for a time equal to or greater than the minimum

RESET pulse width before the device can operate

correctly.

TCLK (JTAG Test Clock, Input)

The TCLK input is the Test Clock input.

TMS (JTAG Test Mode Select, Input)

The TMS input is the Test Mode Select input.

TDI (JTAG Test Data Input, Input)

The TDI input is the Test Data input.

TDO (JTAG Test Data Output, Output)

The TCLK output is the Test Data output.

/TRST (JTAG Reset, Input)

The /TRST input is the Reset input, and serves to reset the

Test Access Port circuitry to its reset condition.

VDD, GND (Positive Power Supply, Ground)

These pins are the main power supply connections to the

ATMCAM. VDD must be held at +3.3 Volt ± 0.3 Volt

relative to the GND pin, which is at 0 Volt, system

reference potential, for correct operation of the device.

Note: The TCLK, TMS, TDI, TDO, and /TRST lines are defined

in the IEEE Standard Test Access Port and Boundary-scan

Architecture

IEEE

Std.

1149.1-1990

and

IEEE

Std.

1149.1a-1993.

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