Altera RLDRAM II Controller MegaCore Function Manual do Utilizador descarregar pdf (Página 31)

Altera Corporation MegaCore Version 9.1 2–21

November 2009 RLDRAM II Controller MegaCore Function User Guide

Functional Description

Figure 2–15. Read Following a Write

Refreshes

You must issue refreshes to the RLDRAM II devices at periodic intervals.

When a refresh is required, assert local_refresh_req and the

RLDRAM II controller issues the refresh command immediately to the

requested bank address on local_bank_addr[] input. You must

correctly insert the refresh request and ensure that the t

timing

parameter is not violated. You can issue single or ganged refreshes. For

ganged refreshes assert local_refresh_req for X clock cycles, where

X is the number of refreshes that you require.

Figure 2–16 shows a single refresh command:

clk

Local Interface

local_write_req

local_read_req

local_addr[]

local_bank_addr[]

local_wdata_req

local_wdata[]

local_dm[]

local_rdata_valid[]

local_rdata[]

RLDRAM II Interface

rldramii_clk

rldramii_clk_n

rldramii_cs_n

rldramii_we_n

rldramii_ref_n

rldramii_a[]

rldramii_ba[]

rldramii_dm[]

rldramii_dq[]

rldramii_qk[]

rldramii_qvld[]

A BB

01 23 45 67

01 23 45 6767

A BA

0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 77

11 1100

1 2 ... 26 27 28 29 30 31 32 33 34 35 36 ... 61 62

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