MU9C2481L-10DC Просмотр технического описания (PDF) - MUSIC Semiconductors

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MU9C2481L-10DC

LANCAM® 1ST Family

MUSIC Semiconductors 

LANCAM 1ST Family

PIN DESCRIPTIONS

All signals are implemented in CMOS technology with TTL levels. Signal names that start with a slash (“/”) are active LOW. Inputs

should never be left floating. The CAM architecture draws large currents during compare operations, mandating the use of good layout

and bypassing techniques. Refer to the Electrical Characteristics section for more information.

/E (Chip Enable, Input, TTL)

The /E input enables the device while LOW. The falling

edge registers the control signals /W and /CM. The rising

edge turns off the DQ pins and clocks the Destination and

Source Segment counters. The four cycle types enabled

by /E are shown in Table 2 on page 2.

/W (Write Enable, Input, TTL)

The /W input selects the direction of data flow during a

device cycle. /W LOW selects a Write cycle and /W HIGH

selects a Read cycle.

/CM (Data/Command Select, Input, TTL)

The /CM input selects whether the input signals on

DQ15–0 are data or commands. /CM LOW selects Command

cycles and /CM HIGH selects Data cycles.

DQ15–0 (Data Bus, I/O, TTL)

The DQ15–0 lines convey data, commands, and status to

and from the LANCAM 1ST. /W and /CM control the

direction and nature of the information that flows to or

from the device. When /E is HIGH, DQ15–0 go to Hi-Z.

/MF (Match Flag, Output, TTL)

The /MF output goes LOW when one or more valid

matches occur during a compare cycle. /MF is HIGH if

there is no match. /MF will be reset when the active

configuration register set is changed.

/FF (Full Flag, Output, TTL)

The /FF output goes LOW when no empty memory

locations exist within the device.

/RESET (Reset, Input, TTL)

/RESET must be driven LOW to place the device in a known

state before operation, which will reset the device to the

conditions shown in Table 4 on page 8. The /RESET pin

should be driven by TTL levels, not directly by an RC time-

out. /E must be kept HIGH during /RESET.

TEST1, TEST2 (Test, Input, TTL)

These pins enable MUSIC production test modes that are

not usable in an application. They should be connected to

ground, either directly or through a pull-down resistor, or

they may be left unconnected. These pins may not be

implemented on all versions of these products.

VCC, GND (Positive Power Supply, Ground)

These pins are the power supply connections to the

LANCAM 1ST. VCC must meet the voltage supply

requirements in the Operating Conditions section relative

to the GND pins, which are at 0 Volts (system reference

potential), for correct operation of the device. All the

ground and power pins must be connected to their

respective planes with adequate bulk and high frequency

bypassing capacitors in close proximity to the device.

3

Rev. 1a

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