MU9C4320L ATMCAM
Pin Descriptions
PIN DESCRIPTIONS
Note: Signal names that start with a slash (“/”) are active LOW. All signals are 3.3V CMOS level. Never leave inputs 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.
DQ31–0 (Data Bus, Three-state, Common
Input/Output)
AA11–0 (Active Address, Output)
The AA11–0 lines convey the CAM Match address, the
VP Table address, the Next Free address, or Random
Access address, depending on the most recent memory
cycle. The /OE input enables the AA11–0 outputs; when
the /OE input is HIGH, the AA11–0 outputs are in their
high-impedance state; when /OE is LOW the AA11–0
lines are active. In a vertically cascaded system after a
Comparison cycle, Write at Next Free Address cycle or
Read/Write at Highest-Priority match, only the
highest-priority device will enable its AA11–0 lines,
regardless of the state of the /OE input. In the event of a
mismatch in both CAM array and VP Table after a
Compare cycle, or after a Write at Next Free Address
cycle into an already full system, the lowest-priority
device will drive the AA11–0 lines with all 1s. The
AA11–0 lines are latched when /E is LOW, and are free to
change only when /E is HIGH.
The DQ31–0 lines convey data to and from the
ATMCAM. When the /E input is HIGH the DQ31–0 lines
are held in their high-impedance state. The /W input
determines whether data flows to or from the device on the
DQ31–0 lines. The source or destination of the data is
determined by the AC11–0 lines and the /AV line. During
a Write cycle, data on the DQ31–0 lines is registered by
the falling edge of /E.
AC11–0 (Address/Control Bus, Input)
When Hardware control is selected, the AC11–0 lines
convey address or control information to the ATMCAM,
depending on the state of the /AV input. When /AV is
LOW then AC11–0 carry an address; when /AV is HIGH
AC11–0 carry control information. Data on the AC11–0
lines are registered by the falling edge of /E. When
software control is selected, the state of the AC11–0 lines
does not affect the operation of the device.
DQ0
DQ1
DQ2
DQ3
VDD
DQ4
DQ5
81
82
83
84
85
86
50
NC
AC11
49
48
47
46
45
AC10
AC9
AC8
GND
AC7
44
43
42
41
40
39
38
87
88
89
90
DQ6
DQ7
GND
DQ8
DQ9
DQ10
AC6
AC5
AC4
VDD
AC3
AC2
ATMCAM
100-Pin TQFP
(Top View)
91
92
93
DQ11
VDD
DQ12
94
95
96
97
98
99
37
36
35
34
33
32
AC1
AC0
GND
TDO
TDI
TMS
TCLK
DQ13
DQ14
DQ15
GND
31
100
Figure 3: ATMCAM Pinout
4
Rev. 3
MUSIC [ MUSIC SEMICONDUCTORS ]
