ATSAM3703 datasheet(25/36 Pages) ATMEL

25 / 36 page

6237A–DRMSD–29-May-06

ATSAM3703

9.4.3.3

Timing

General Parameters

The SDR is used with parameters as in Table 9-10.

Command Sequencing

The SDRAM device must support following parameters.

Table 9-10.

SDR General Parameters

Symbol

Parameter

Value

(50 MHz)

Value

(100 MHz)

tCK

Clock cycle time

20 ns

10 ns

Mode Register

CAS Latency

2 cycles

Burst length

4 data

Burst type

sequential

Operating mode

normal

Output drive strength

normal

Table 9-11.

Supported Parameters

Symbol

Parameter

Value

(50 MHz)

Value

(100 MHz)

MRD

MODE REGISTER SET command cycle time

min 40 ns

min 20 ns

RAS

ACTIVE to PRECHARGE command

min 60 ns

max 70 us

min 50 ns

max 70 us

tRC

ACTIVE to ACTIVE/AUTO REFRESH command period

min 80 ns

min 70 ns

tRFC

AUTO REFRESH to ACTIVE/AUTO REFRESH

command period

min 80 ns

min 70 ns

tRCD

ACTIVE to READ or WRITE delay

min 20 ns

PRECHARGE command period

min 20 ns

RRD

ACTIVE bank a to ACTIVE bank b command

min 20 ns

tWR

WRITE recovery time

min 20 ns

XSNR

Exit self refresh to non-READ command

min 80 ns

XSRD

Exit self refresh to READ command

min 4 us

min 2 us

tREFI

Average periodic REFRESH interval

7.8 us

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