EP1M350 datasheet(44/86 Pages) ALTERA

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Altera Corporation

Mercury Programmable Logic Device Family Data Sheet

Figure 23. Encoded CAM Address Outputs

Figure 24. Unencoded CAM Address Outputs

Notes to Figure 24:

(1)

For an unencoded output, the ESB only supports 31 input data bits. One input bit

is used by the select line to choose one of the two banks of 16 outputs.

(2)

If the select input is a 1, then CAM outputs odd words between 1 through 15. If

the select input is a 0, CAM outputs words even words between 0 through 14.

In single-match mode, it takes two clock cycles to write into CAM, but

only one clock cycle to read from CAM. In this mode, both encoded and

unencoded outputs are available without external logic. Single-match

mode is better suited for designs without duplicate data in the memory.

CAM

data[31..0] = 45

addr[15..0] = 12

Encoded Output

match = 1

Address

Data

CAM

data[30..0] =45

(1)

select

(2)

Unencoded outputs.

q12 goes high to

signify a match.

q12

q13

q14

q15

Address

Data

EP1M350 数据表(PDF) 44 Page - Altera Corporation

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