Motorola TMS320C6711D warranty Synchronous Dram Timing

Models: TMS320C6711D

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SPRS292A − OCTOBER 2005 − REVISED NOVEMBER 2005

SYNCHRONOUS DRAM TIMING

timing requirements for synchronous DRAM cycles(see Figure 31)

 

 

 

GDPA-167

 

 

 

 

ZDPA−167

 

NO.

 

 

−200

 

UNIT

 

 

 

−250

 

 

 

 

 

MIN

 

MAX

 

 

 

 

 

 

 

 

6

tsu(EDV-EKOH)

Setup time, read EDx valid before ECLKOUT high

1.5

 

 

ns

7

th(EKOH-EDV)

Hold time, read EDx valid after ECLKOUT high

2.5

 

 

ns

The SDRAM interface takes advantage of the internal burst counter in the SDRAM. Accesses default to incrementing 4-word bursts, but random bursts and decrementing bursts are done by interrupting bursts in progress. All burst types can sustain continuous data flow.

switching characteristics over recommended operating conditions for synchronous DRAM cycles†‡ (see Figure 31−Figure 37)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GDPA-167

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ZDPA−167

 

NO.

 

PARAMETER

−200

 

UNIT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

−250

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MIN

MAX

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

td(EKOH-CEV)

Delay time, ECLKOUT high to

 

 

 

 

 

valid

1.5

7

ns

CEx

 

 

2

td(EKOH-BEV)

Delay time, ECLKOUT high to

 

 

 

 

 

valid

 

7

ns

BEx

 

 

 

3

td(EKOH-BEIV)

Delay time, ECLKOUT high to

 

 

 

 

 

invalid

1.5

 

ns

BEx

 

 

 

4

td(EKOH-EAV)

Delay time, ECLKOUT high to EAx valid

 

7

ns

5

td(EKOH-EAIV)

Delay time, ECLKOUT high to EAx invalid

1.5

 

ns

8

td(EKOH-CASV)

Delay time, ECLKOUT high to

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1.5

7

ns

 

 

 

 

ARE/SDCAS/SSADS valid

9

td(EKOH-EDV)

Delay time, ECLKOUT high to

 

 

 

 

valid

 

7

ns

EDx

 

10

td(EKOH-EDIV)

Delay time, ECLKOUT high to

 

 

 

 

invalid

1.5

 

ns

EDx

 

11

td(EKOH-WEV)

Delay time, ECLKOUT high to

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1.5

7

ns

AWE/SDWE/SSWE valid

12

td(EKOH-RAS)

Delay time, ECLKOUT high to,

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1.5

7

ns

 

AOE/SDRAS/SSOE valid

The SDRAM interface takes advantage of the internal burst counter in the SDRAM. Accesses default to incrementing 4-word bursts, but random bursts and decrementing bursts are done by interrupting bursts in progress. All burst types can sustain continuous data flow.

ARE/SDCAS/SSADS, AWE/SDWE/SSWE, and AOE/SDRAS/SSOE operate as SDCAS, SDWE, and SDRAS, respectively, during SDRAM accesses.

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POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443

Page 76
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Motorola TMS320C6711D warranty Synchronous Dram Timing, Timing requirements for synchronous Dram cycles† see Figure