M11B416256A datasheet(6/15 Pages) ESMT

6 / 15 page

EliteMT

M11B416256A

Elite Memory Technology Inc

Publication Date : Feb. 2004

Revision : 1.9

6/15

Notes :

Enables on-chip refresh and address counters.

VIH(min) and VIL(max) are reference levels for

measuring timing of input signals. Transition times

are measured between VIH and VIL.

In addition to meet the transition rate specification,

all input signals must transit between VIH and VIL in a

monotonic manner.

Assume that tRCD < tRCD(max). If tRCD is greater than

the maximum recommended value shown in this

table, tRAC will increase by the amount that tRCD

exceeds the value shown.

Assume that tRCD

≥ tRCD (max)

If CAS is low at the falling edge of RAS , data-out

will be maintained from the previous cycle. To initiate

a new cycle and clear the data-out buffer, CAS and

RAS

must be pulsed high.

Operation within the tRCD limit ensures that tRCD

(max) can be met, tRCD (max) is specified as a

reference point only ; if tRCD is greater than the

specified tRCD (max) limit, access time is controlled

by tCAC.

Operation within the tRAD limit ensures that tRAD(max)

can be met. tRAD(max) is specified as a reference

point only ; if tRAD is greater than the specified tRAD

(max) limit, access time is controlled by tAA.

Either tRCH or tRRH must be satisfied for a READ

cycle.

10.

tOFF1(max) defines the time at which the output

achieves the open circuit condition ; it is not a

reference to VOH or VOL.

11.

tWCS, tRWD, tAWD and tCWD are restrictive operating

parameters

LATE

WRITE

and

READ-MODIFY-WRITE cycle only. If tWCS

≥

tWCS(min) , the cycle is an EARLY WRITE cycle and

the data output will remain an open circuit throughout

the entire cycle. If tRWD

≥ tRWD(min) , tAWD ≥ tAWD(min)

and tCWD

≥ tCWD(min) , the cycle is READ-WRITE and

the data output will contain data read from the

selected cell. If neither of the above conditions is

met, the state of I/O (at access time and until CAS

and RAS or OE go

back to VIH ) is indeterminate. OE held high and

WE taken low after CAS goes low result in a LATE

WRITE ( OE -controlled) cycle.

12. Those parameters are referenced to CAS leading

edge in EARLY WRITE cycles and WE leading edge

in LATE WRITE or READ-MODIFY- WRITE cycles.

13. During a READ cycle, if OE is low then taken HIGH

before CAS goes high, I/O goes open, if OE is tied

permanently

low,

LATE

WRITE

READ-MODIFY-WRITE operation is not possible.

14. An initial pause of 200µs is required after power-up

followed by eight RAS refresh cycles ( RAS only or

CBR) before proper device operation is assured. The

eight RAS cycle wake-ups should be repeated any

time the tREF refresh requirement is exceeded.

15. WRITE command is defined as WE going low.

16. LATE WRITE and READ-MODIFY-WRITE cycles must

have both tOFF2 and tOEH met ( OE high during

WRITE cycle) in order to ensure that the output

buffers will be open during the WRITE cycles.

17. The I/Os open during READ cycles once tOFF1 or tOFF2

occur.

18. Referenced to the earlier CAS falling edge.

19. Referenced to the latter CAS rising edge.

20. Output parameter (I/O) is referenced to corresponding

CAS

input, IO0~7 by CASL

and IO8~15 by

CASH

21. Last falling CAS edge to first rising CAS edge.

22. Last rising CAS edge to next cycle’s last rising

CAS

edge.

23. Last rising CAS edge to first falling CAS edge.

24. Each CAS must meet minimum pulse width.

25. Referenced to the latter CAS falling edge.

26. All IOs controlled by OE , regardless CASL and

CASH

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