Altera RLDRAM II Controller MegaCore Function Manual do Utilizador descarregar pdf (Página 29)

Altera Corporation MegaCore Version 9.1 2–19

November 2009 RLDRAM II Controller MegaCore Function User Guide

Functional Description

Figure 2–13. Write Following a Read

Reads

When you assert local_read_req, the control logic issues the read

transaction immediately at the memory interface.

In DQS mode the read data, rldramii_dq[] (CIO devices) or

rldramii_q[] (SIO devices), and the QVLD signals,

rldramii_qvld[], are captured using the delayed rldramii_qk[]

data strobes that have been phase shifted using the dedicated DQS delay

circuitry.

In non-DQS mode the read data, rldramii_dq[] or rldramii_q[],

and the QVLD signals, rldramii_qvld[], are captured using an

external capture clock.

clk

Local_Interface

local_write_req

local_read_req

local_addr[]

local_ba[]

local_wdata_req

local_wdata[]

local_dm[]

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

A BA

11 11

0000

0 1 0 11

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Altera RLDRAM II Controller MegaCore Function Manual do Utilizador Página 29