Refreshes, Figure 2–15, Show – Altera RLDRAM II Controller MegaCore Function User Manual
Page 31: Figure 2–15. read following a write
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
RC
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.
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
B
B
A
B
B
01 23 45
67
00
01
23 45 67
67
A
B
A
A
B
A
0 1 2 3 4 5 6 7
0 1 2 3 4 5 6 7
7
11
11
00