Altera RLDRAM II Controller MegaCore Function Uživatelský manuál Strana 29

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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 BB
00
01
A BA
A BA
11 11
0000
0 1 0 11
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