RM46L450
RM46L850
SPNS184 –SEPTEMBER 2012
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4.14 External Memory Interface (EMIF)
4.14.1 Features
The EMIF includes many features to enhance the ease and flexibility of connecting to external
asynchronous memories or SDRAM devices. The EMIF features includes support for:
•
•
•
•
•
•
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3 addressable chip select for asynchronous memories of up to 32kB each
1 addressable chip select space for SDRAMs up to 128MB
8 or 16-bit data bus width
Programmable cycle timings such as setup, strobe, and hold times as well as turnaround time
Select strobe mode
Extended Wait mode
Data bus parking
4.14.2 Electrical and Timing Specifications
4.14.2.1 Read Timing (Asynchronous RAM)
3
1
EMIF_nCS[3:2]
EMIF_BA[1:0]
EMIF_ADDR[12:0]
EMIF_nDQM[1:0]
4
8
5
9
6
7
29
30
10
EMIF_nOE
13
12
EMIF_DATA[15:0]
EMIF_nWE
Figure 4-12. Asynchronous Memory Read Timing
88
System Information and Electrical Specifications
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