ATSAM9743 datasheet(12/21 Pages) ATMEL

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ATSAM9743

1773B–DRMSD–11/02

Table 9. Parameters for External 8-bit SRAM Read/Write

Symbol

Parameter

Min

Typ

Max

Unit

tRC

Word (2 x bytes) read cycle time

5 x tCK

6 x tCK

CSOE

Chip select low. Address valid to WOE low

2 x t

CK - 5

3 x t

CK + 5

POE

Output enable pulse width

3 x t

tACE

Chip select. Access low byte access time.

3 x tCK - 5

Output enable low byte access time

CK - 5

ORB

Output enable low to byte select high

tACH

Byte select high byte access time

2 x tCK- 5

Chip select or WOE high to input data HI-Z

2 x t

CK - 5

Write (2 x bytes) write cycle time

5 x t

6 x t

tCSWE

1st WWE low from CS or address or WOE

2 x tCK - 10

Write (low and high byte) pulse width

1.5 x t

CK - 5

DW1

Data out low byte setup time

1.5 x t

CK - 10

tDH1

Data out low byte hold time

0.5 x tCK + 10

RBS high to second write pulse

0.5 x t

CK - 5

DW2

Data out high byte setup time

2 x t

CK - 10

tDH2

Data out high byte hold time

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