Altera RLDRAM II Controller MegaCore Function - Manual (Page 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 B B
A B B
00
01
A B A
A B A
11 11 00 00
0 1 0 1 1