AM1707 datasheet(71/199 Pages) TI

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EMA_CLK

EMA_BA[1:0]

EMA_A[12:0]

EMA_D[15:0]

BASIC SDRAM

WRITE OPERATION

EMA_CS[0]

EMA_WE_DQM[1:0]

EMA_RAS

EMA_CAS

EMA_WE

AM1707

www.ti.com

SPRS637A – FEBRUARY 2010 – REVISED APRIL 2010

Table 6-23. EMIFA Asynchronous Memory Switching Characteristics (1) (2) (3) (continued)

No.

PARAMETER

MIN

NOM

MAX

UNIT

th(EMWEH-

Output hold time, EMA_WE high to

(WH)*E-3

(WH)*E

(WH)*E+3

EMDQMIV)

EMA_BA[1:0] invalid

tsu(EMBAV-

Output setup time, EMA_BA[1:0] valid to

(WS)*E-3

(WS)*E

(WS)*E+3

EMWEL)

EMA_WE low

Output hold time, EMA_WE high to

th(EMWEH-EMBAIV)

(WH)*E-3

(WH)*E

(WH)*E+3

EMA_BA[1:0] invalid

Output setup time, EMA_A[13:0] valid to

tsu(EMAV-EMWEL)

(WS)*E-3

(WS)*E

(WS)*E+3

EMA_WE low

Output hold time, EMA_WE high to

th(EMWEH-EMAIV)

(WH)*E-3

(WH)*E

(WH)*E+3

EMA_A[13:0] invalid

EMA_WE active low width (EW = 0)

(WST)*E-3

(WST)*E

(WST)*E+3

tw(EMWEL)

(WST+(EWC*16))

(WST+(EWC*16)

EMA_WE active low width (EW = 1)

(WST+(EWC*16))*E

*E-3

)*E+3

td(EMWAITH-

Delay time from EMA_WAIT deasserted to

3E-3

4E+3

EMWEH)

EMA_WE high

Output setup time, EMA_D[15:0] valid to

tsu(EMDV-EMWEL)

(WS)*E-3

(WS)*E

(WS)*E+3

EMA_WE low

Output hold time, EMA_WE high to

th(EMWEH-EMDIV)

(WH)*E-3

(WH)*E

(WH)*E+3

EMA_D[15:0] invalid

Figure 6-14. EMIFA Basic SDRAM Write Operation

Peripheral Information and Electrical Specifications

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