Altera First-In-First-Out Partitioner Manuel d'utilisateur télécharger pdf (Page 10)

8 Altera Corporation

FIFO Partitioner Megafunction User Guide Getting Started

Considering the restriction on the TDM_clk, it is easy to estimate the

performance of each FIFO based on the number of FIFOs implemented

and the reported f

MAX

of the TDM clock after compilation. Table 2 shows

approximate values for performance of various configurations given

best-case (275 MHz) TDM_clk performance, and a conservative estimate

of achievable TDM_clk performance (200 MHz).

Specifying a

FIFO

Partitioner

Function Using

the FIFO

Partitioner

MegaWizard

You specify the desired FIFO Partitioner configuration using the

MegaWizard

Plug-In Manager. The wizard prompts you for the

following information:

■ How many FIFOs to implement

■ The individual configuration options for each FIFO

The wizard generates HDL files implementing the specified FIFO

Partitioner configuration, and a information file with information about

the FIFO Partitioner function. The information file contains frequency

requirements for the clocks associated with the function.

Table 2. Estimated Performance of FIFO Ports

Number of FIFOs (1)

MAX

of Each FIFO Port Assuming Bandwidth is

Shared Evenly (MHz)

TDM_clk at 275 MHz TDM_clk at 200 MHz (2)

2 91.67 66.6

3 91.67 66.6

4 68.75 50.00

5 55.00 40.00

6 45.83 33.3

7 39.28 28.6

8 34.37 25.00

9 30.56 22.20

10 27.50 20.00

Notes to Table 2:

(1) Configurations with more than 10 FIFOs are not recommended for most designs

due to performance limitations.

(2) TDM_clk frequencies above 200 MHz are achievable. Refer to compilation

results for achievable f

MAX

for a given configuration.

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 21 22

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Altera First-In-First-Out Partitioner Manuel d'utilisateur Page 10

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