Altera QDRII SRAM Controller MegaCore Function Bedienungsanleitung PDF herunterladen (Seite 62)

3–30 MegaCore Version 9.1 Altera Corporation

QDRII SRAM Controller MegaCore Function User Guide November 2009

Parameters

Memory

Table 3–8 shows the memory type parameters.

Table 3–8. Memory Type Parameters

Parameter Value Description

Memory device Part number A part number for a particular

memory device. Choosing an entry

other than Custom sets many of the

parameters in the wizard to the

correct value for the specified part. If

any such parameter is changed to a

value that is not supported by the

specified device, the preset

automatically changes to custom.

You can add your own devices to

this list by editing the

memory_types.dat file in the

\constraints directory.

QDRII or

QDRII+

Selects QDRII or QDRII+ SRAM

devices.

Clock speed Up to

300 MHz (1)

The memory controller clock

frequency. The constraints script

and the datapath use this clock

speed. It must be set to the value

that you intend to use. The first time

you use IP Toolbench or if you turn

on Automatically generate the

PLL, it uses this value for the IP

Toolbench-generated PLL’s input

and output clocks .

Voltage 1.5 or 1.8 V Memory device voltage.

Burst length 2/4 Burst length.

Data bus width 8, 9, 16, 18,

32, 36

QDRII SRAM device width.

Address bus width 15 to 23 Memory space.

Memory latency For QDRII,

1.5; for

QDRII+, 2.0

or 2.5

The memory latency. QDRII+ is

bursts of four only.

Note to Ta b le 3 –8 :

(1) IP Toolbench allows you to enter up to 600 MHz, but Altera only supports the

QDRII SRAM controller up to 300 MHz.

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