参数资料
型号: IPR-SDRAM/DDR2
厂商: Altera
文件页数: 59/106页
文件大小: 0K
描述: IP DDR2 SDRAM CONTROLLER RENEW
标准包装: 1
系列: *
类型: MegaCore
功能: DDR2 SDRAM 控制器
许可证: 续用许可证
Chapter 3: Functional Description
3–23
Interfaces & Signals
4. The controller returns the read data for the first request by asserting the
local_rdata_valid signal. The exact number of clock cycles between the
controller accepting the request and returning the data depends on the number of
other requests pending in the controller, the state the memory is in, and the timing
requirements of the memory (e.g., the CAS latency).
5. The controller returns the read data for the subsequent read requests.
Read-Write-Read-Write
Figure 3–15 on page 3–23 shows a sequence of interleaved reads and writes.
Figure 3–15. Read-Write-Read-Write
[1]
[2]
[3]
[4]
[5]
[6]
clk
Local Interface
local_read_req
local_write_req
local_ready
local_size
0
1
0
local_cs_addr (1)
0
2
0
2
0
local_row_addr (1) 0000 0143 0021 0143 0021
0000
local_bank_addr (1)
0
1
2
1
2
0
local_col_addr (1) 000 019 0 8 6 01A 0 8 5
local_rdvalid_in_n
local_rdata_valid
000
local_rdata
local_wdata_req
FFD0
9A3 8
local_wdata
DF0 8
D5CD
14D9
DDR SDRAM
Interface
ddr_cs_n
FF
FB
FF
FB
FE
FF
FE
FF FB
FF
FE
FF
ddr_cke
FF
ddr_a
0000
0143 0000 0032 0021
0000
010C0000 0034
0000
010A
0000
ddr_ba
0
1
0
1
2
0
2
0
1
0
2
0
DDR Command (2)
NOP
ACT NOP RD ACT
NOP
WR NOP RD
NOP
WR
NOP
ddr_ras_n
ddr_cas_n
ddr_we_n
ddr_dm
ddr_dq
ddr_dqs
Notes to Figure 3–15 :
(1) The local_cs_addr , local_row_addr , local_bank_addr , and local_col_addr signals are a representation of the
local_addr signal.
(2) DDR Command shows the command that the command signals are issuing.
1. The user logic requests a read request by asserting the local_read_req signal
along with the size and address for that read. Because the local_ready signal is
high, that request can be considered accepted.
? March 2009
Altera Corporation
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