cx82100 Conexant Systems, Inc., cx82100 Datasheet - Page 91

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cx82100

Manufacturer Part Number
cx82100
Description
Home Network Processor Hnp
Manufacturer
Conexant Systems, Inc.
Datasheet

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6
6.1
101306C
External Memory Controller Interface Description
PC100 Compliant SDRAM Interface
Conexant Proprietary and Confidential Information
The External Memory Controller (EMC) provides a 16-bit interface to support up to 8
MB of external SDRAM. Figure 6-1 shows a typical SDRAM functional block diagram.
Note that the actual SDRAM design varies from vendor to vendor. Figure 6-1 also shows
an Intel PC100 compliant interface between the EMC and the SDRAM. Table 6-1 lists
the definition for each interface signal. A PC100 compliant SDRAM must also support a
mode register whose functions are defined in Table 6-2. The mode register is
programmable through the MRS (Mode Register Set) command defined in the PC100
Specification (see Reference [6]).
Figure 6-1. SDRAM Interface
CX82100 Home Network Processor Data Sheet
(2x or 4x)
Decode +
Banks
Control
Logic
CA
SDRAM
Data I/O +
Control
Decode +
Logic
Control
Logic
RA
Control Logic
Mode register
Command
Refresh
Bank
MD[15:0]
MA[11:0]
MM[1:0]
MB[1:0]
MRAS#
MCAS#
MW E#
MCKE
MCS#
MCLK
Controller
External
Mem ory
ASB
101545_025
HNP
6-1

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