Altera DDR SDRAM High-Performance Controllers and ALTMEMP Bedienungsanleitung Seite 132

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Seitenansicht 131
8–4 Chapter 8: Timing Diagrams
DDR and DDR2 High-Performance Controllers II
External Memory Interface Handbook Volume 3 June 2011 Altera Corporation
Section I. DDR and DDR2 SDRAM Controllers with ALTMEMPHY IP User Guide
Half-Rate Write
Figure 8–2. Half-Rate Write Operation for HPC II
Local Interface
local_address[25:0]
local_size[4:0]
local_ready
local_burstbegin
local_be[3:0]
local_write_req
local_wdata[31:0]
afi_addr[27:0]
Controller - AFI
afi_ba[5:0]
afi_cs_n[3:0]
AFI Command[2:0]
afi_dm[3:0]
afi_wlat[4:0]
afi_dqs_burst[0]
afi_dqs_burst[1]
afi_wdata[31:0]
afi_wdata_valid[1:0]
mem_cke[1:0]
AFI Memory Interface
mem_clk
mem_ba[2:0]
mem_addr[13:0]
mem_cs_n[0]
Mem Command[2:0]
mem_dqs
mem_dm
mem_dq[7:0]
mem_odt[1:0]
phy_clk
00000020000000 0000004 0000000
2
[1] [2] [3] [4] [5] [6]
AABBCCDD AABBCCDD AABBCCDD
EEFF0011 EEFF0011 EEFF0011
AABBCCDD AABBCCDD AABBCCDD
EEFF0011 EEFF0011 EEFF0011
0000000 0000000 0000000 0000000 0000008 0000000 0000010 0000000
B F B F B F B FF
F
B
ACT NOP WR NOP WR NOP WR NOPNOP WR
0 FF
2
0
3 0 3
0000 0000 0000 0000 0008 0000 0010
NOP
ACT NOP WR NOP NOP NOP NOPWR WR WR
00 00
DD
CC
BB AA
11
00
FF
EE
DD
CC
BB AA
11
00
FF
EE
DD
CC
BB AA
11
00
FF
EE
Seitenansicht 131

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