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Intel
®
IXP42X Product Line of Network Processors and IXC1100 Control Plane Processor
September 2006 DM
Order Number: 252480-006US 277
SDRAM Controller—Intel
®
IXP42X product line and IXC1100 control plane processors
As stated previously, the supported memory types for each bank of SDRAM must be
64Mbit, 128-Mbit, 256-Mbit, or 512-Mbit memory device types. The IXP42X product
line and IXC1100 control plane processors memory controller supports only two
memory devices per each bank. Figure 54 illustrates how to interface to two banks of
SDRAM memory. Each memory device in the below example is a 16-bit device (x16).
Figure 53. 8-, 16-, 32-, 64- or 128-Mbyte — One-Bank SDRAM Interface Configuration
SDM_CS_N0
SDRAM Interface
SDM_DATA[31:0]
DQ[15:0]
SDM_ADDR[12:0]
A[12:0]
SDM_CS[_N1:0]
SDM_RAS_N
SDM_CAS_N
SDM_WE_N
SDM__DQM[3:0]
SDM_BA[1:0]
SDM_CKE
SDM_CLKOUT
CS#
RAS#
CAS#
WE#
BA[1:0]
CKE
CLK
DQM[1:0]
DQ[15:0]
A[12:0]
CS#
RAS#
CAS#
WE#
BA[1:0]
CKE
CLK
DQM[1:0]
SDRAM#1
SDRAM#2
BANK0
SDM_DQM[1:0]
SDM_DQM[3:2]
SDM_DQM[3:0]
B4963-01
Intel
®
IXP42X
Product Line /
Intel
®
IXC1100
Control Plane
Processor