LSI Logic Confidential
13-6
SDRAM Interface
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
Figure 13.4 32-bit DRAM Connections using DDR SRAM
13.1 DRAM Address Map
Every DRAM starts at a base address that is at an 8 Mbytes boundary.
The addressing can be determined from the size of the
DRAM/PAGE/Bank Count. The total DRAM address space always
appears contiguous without any hole in-between. To avoid any hole,
external slots are populated starting at slot 0.
13.2 DRAM Address Field Description
To support 64 Mbytes (16 Mwords) with a 32-bit wide word requires
24 bits of word-addressing. The 7 to 9 LSBs are used to select word
inside a page. The bits above the column address bits are used to select
banks (2 bits for 4 banks, and 3 bits for 8 banks). The bits above
E5 Device
RAS
CAS
CS
CKE
DM[3:0]
DQS
DQ[15:0]
A[10:0]
CLK
WE
RAS
CAS
CS
CKE
DM[3:0]
DQS
DQ[31:16] A[10:0]
CLK
WE
CLK
CLK
2M x 32 SDRAM (4 banks)
2M x 32 SDRAM (4 banks)
VREF
VREF
BA[1:0]
BA[1:0]
VDD2.5
2
VDD2.5
2
VDD2.5
2
SDRAM_RAS
SDRAM_A[14]
SDRAM_CAS
SDRAM_WE
SDRAM_CLK[0]
SDRAM_A[10:0]
SDRAM_DQM[3:0]
SDRAM_DQ[31:0]
SDRAM_A[12:11]
SDRAM_CKE
SDRAM_CLK[1]
SDRAM_A[15]
SDRAM_CLK[1]
SDRAM_CLK[0]
SDRAM_DQS[3]
SDRAM_DQS[2]
SDRAM_DQS[1]
SDRAM_DQS[0]
SDRAM_VREF
Содержание DMN-8600
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