Datasheet

EMIF_nCS[3:2]
EMIF_BA[1:0]
13
12
EMIF_ADDR[21:0]
EMIF_nOE
EMIF_DATA[15:0]
EMIF_nWE
10
5
9
7
4
8
6
3
1
EMIF_nDQM[1:0]
30
29
108
RM57L843
SPNS215C –FEBRUARY 2014–REVISED JUNE 2016 www.ti.com
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System Information and Electrical Specifications Copyright © 2014–2016, Texas Instruments Incorporated
6.14 External Memory Interface (EMIF)
6.14.1 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:
• 3 addressable chip select for asynchronous memories of up to 16MB 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
NOTE
For a 32-bit access on the 16-bit EMIF interface, the lower 16-bits (the EMIF_BA[1] will be
low) will be put out first followed by the upper 16-bits (EMIF_BA[1] will be high).
6.14.2 Electrical and Timing Specifications
6.14.2.1 Read Timing (Asynchronous RAM)
Figure 6-11. Asynchronous Memory Read Timing