OMAP-L137 Low-Power Applications Processor
SPRS563A–SEPTEMBER 2008–REVISED OCTOBER 2008
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Table 6-21. EMIFA Asynchronous Memory Switching Characteristics (continued)
OMAP-L137
Nom
NO
.
PARAMETER
UNIT
MIN
MAX
Output hold time, EMA_WE high to
EMA_CE[5:2] high (SS = 0)
(WH)*E-3
(WH)*E
0
(WH)*E+3
+3
ns
ns
ns
ns
ns
ns
ns
17 th(EMWEH-EMCEH)
Output hold time, EMA_WE high to
EMA_CE[5:2] high (SS = 1)
-3
(WS)*E-3
(WH)*E-3
(WS)*E-3
(WH)*E-3
(WS)*E-3
tsu(EMDQMV-
EMWEL)
Output setup time, EMA_BA[1:0] valid to
EMA_WE low
18
19
(WS)*E
(WH)*E
(WS)*E
(WH)*E
(WS)*E
(WS)*E+3
(WH)*E+3
(WS)*E+3
(WH)*E+3
(WS)*E+3
th(EMWEH-
EMDQMIV)
Output hold time, EMA_WE high to
EMA_BA[1:0] invalid
Output setup time, EMA_BA[1:0] valid to
EMA_WE low
20 tsu(EMBAV-EMWEL)
Output hold time, EMA_WE high to
EMA_BA[1:0] invalid
21 th(EMWEH-EMBAIV)
22 tsu(EMAV-EMWEL)
23 th(EMWEH-EMAIV)
Output setup time, EMA_A[13:0] valid to
EMA_WE low
Output hold time, EMA_WE high to
EMA_A[13:0] invalid
(WH)*E-3
(WH)*E
(WST)*E
(WH)*E+3
ns
ns
ns
EMA_WE active low width (EW = 0)
(WST)*E-3
(WST)*E+3
24 tw(EMWEL)
(WST+(EWC*16))
*E-3
(WST+(EWC*16))
*E+3
EMA_WE active low width (EW = 1)
(WST+(EWC*16))*E
td(EMWAITH-
EMWEH)
Delay time from EMA_WAIT deasserted to
EMA_WE high
25
3E-3
(WS)*E-3
(WH)*E-3
4E
(WS)*E
(WH)*E
4E+3
(WS)*E+3
(WH)*E+3
ns
ns
ns
Output setup time, EMA_D[15:0] valid to
EMA_WE low
26 tsu(EMDV-EMWEL)
Output hold time, EMA_WE high to
EMA_D[15:0] invalid
27 th(EMWEH-EMDIV)
1
BASIC SDRAM
WRITE OPERATION
2
2
EMA_CLK
3
5
7
7
9
4
EMA_CS[0]
EMA_WE_DQM[1:0]
EMA_BA[1:0]
6
8
8
EMA_A[12:0]
10
EMA_D[15:0]
EMA_RAS
EMA_CAS
EMA_WE
11
12
13
15
16
Figure 6-13. EMIFA Basic SDRAM Write Operation
110
Peripheral Information and Electrical Specifications
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