Altera RLDRAM II Controller MegaCore Function Manual de usuario descargar pdf (Pagina 35)

Altera Corporation MegaCore Version 9.1 2–25

November 2009 RLDRAM II Controller MegaCore Function User Guide

Functional Description

Table 2–4 shows the local interface signals.

reset_read_clk_n[]

DQS mode:

the number of

RLDRAM II devices

attached to the memory

interface

Non-DQS mode:

Input Reset input for logic on the capture clock

domain. In DQS mode, the capture clock

domain is

capture_clk[]; in non-DQS

mode, it is

non_dqs_capture_clk. In

DQS mode, each

reset_read_clk_n[] is associated

with the corresponding

capture_clk[]

clock domain. The

reset_read_clk_n[] can be asserted

asynchronously but must be deasserted

synchronous to the rising edge of the

capture clock.

capture_clk[]

The number of

RLDRAM II devices

attached to memory

interface

Output Undelayed DQS clock used by capture

circuitry to capture RLDRAM II read data.

There is one

capture_clk[] per

attached RLDRAM II device. DQS mode

only.

Table 2–3. System Signals (Part 3 of 3)

Name

Width

(Bits)

Direction Description

Table 2–4. Local Interface Signals (Part 1 of 2)

Name

Width

(Bits)

Direction Description

local_addr[]

Device dependant Input RLDRAM II address. IP Toolbench refers to the

memory.dat file and selects the address width

appropriate to the device.

local_bank_addr[]

3 – RLDRAM II bank address.

local_dm[]

The number of

RLDRAM II devices

attached to the

memory interface ×

Input Optional local data mask (DM). Twice the width of

the memory

rldramii_dm[] bus. When all

high, all writes are masked.

local_read_req

1 Input Read request signal.

local_refresh_req

1 Input User controlled refresh request. This allows

complete control over when refreshes are issued

to the memory. The refresh is issued to the bank

address on

local_bank_addr[].

1 2 ... 30 31 32 33 34 35 36 37 38 39 40 ... 61 62

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