70T653MS12BCGI datasheet(21/24 Pages) IDT

21 / 24 page

IDT70T653M

High-Speed 2.5V 512K x 36 Asynchronous Dual-Port Static RAM

Industrial and Commercial Temperature Ranges

Sleep Mode

The IDT70T653M is equipped with an optional sleep or low power

modeonbothports.Thesleepmodepinonbothportsisactivehigh.During

normal operation, the ZZ pin is pulled low. When ZZ is pulled high, the

port will enter sleep mode where it will meet lowest possible power

conditions.Thesleepmodetimingdiagramshowsthemodesofoperation:

Normal Operation, No Read/Write Allowed and Sleep Mode.

Foraperiodoftime priortosleepmodeandafterrecoveringfromsleep

mode(tZZSandtZZR),newreadsorwritesarenotallowed.Ifawriteorread

operation occurs during these periods, the memory array may be

corrupted. Validity of data out from the RAM cannot be guaranteed

immediately after ZZ is asserted (prior to being in sleep).

DuringsleepmodetheRAMautomaticallydeselectsitself.TheRAM

disconnectsitsinternalbuffer.Alloutputswillremaininhigh-Zstatewhile

insleepmode.Allinputsareallowedtotoggle.TheRAMwillnotbeselected

and will not perform any reads or writes.

JTAG Functionality and Configuration

TheIDT70T653Miscomposedoftwoindependentmemoryarrays,

and thus cannot be treated as a single JTAG device in the scan chain.

The two arrays (A and B) each have identical characteristics and

commandsbutmustbetreatedasseparateentitiesinJTAGoperations.

Please refer to Figure 5.

JTAG signaling must be provided serially to each array and utilizes

theinformationprovidedintheIdentificationRegisterDefinitions,Scan

commands for Array B must precede those for Array A in any JTAG

operationssenttotheIDT70T653M. PleasereferenceApplicationNote

AN-411,"JTAGTestingofMultichipModules"forspecificinstructionson

performing JTAG testing on the IDT70T653M. AN-411 is available at

www.idt.com.

Array A

Array B

TCK

TMS

TRST

TDI

TDOA

TDIB

TDO

5679 drw 23

IDT70T653M

Figure 5. JTAG Configuration for IDT70T653M

70T653MS12BCGI Datasheet(PDF) 21 Page - Integrated Device Technology

70T653MS12BCGI Datasheet(HTML) 21 Page - Integrated Device Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

Datasheet Download

Link URL