NT5CB128M8GP-EKB datasheet(82/160 Pages) NANYA

82 / 160 page

Version 2.2

Nanya Technology Cooperation ©

04/2019

NTC Proprietary

Level: Property

DDR3(L) 1Gb SDRAM

NT5CB(C)128M8GN / NT5CB(C)64M16GP

Asynchronous to Synchronous ODT Mode transition during Power-Down Exit

If DLL is selected to be frozen in Precharge Power Down Mode by

the setting of bit A12 in MR0 to “0”, there is also a

transition period around power down exit, where either synchronous or asynchronous response to a change in ODT must

be expected from the DDR3(L) SDRAM.

This transition period starts tANPD before CKE is first registered high, and ends tXPDLL after CKE is first registered high.

tANPD is equal to (WL -1) and is counted (backwards) from the clock cycle where CKE is first registered high.

ODT assertion during the transition period may result in an RTT change as early as the smaller of tAONPDmin and (ODT-

Lon*tCK+tAONmin) and as late as the larger of tAONPDmax and (ODTLon*tCK+tAONmax). ODT de-assertion during the tran-

sition period may result in an RTT change as early as the smaller of tAOFPDmin and (ODTLoff*tCK+tAOFmin) and as late as

the larger of tAOFPDmax and (ODToff*tCK+tAOFmax). Note that if AL has a large value, the range where RTT is uncertain

becomes quite large. The following figure shows the three different cases: ODT_C, asynchronous response before tANPD;

ODT_B has a state change of ODT during the transition period; ODT_A shows a state change of ODT after the transition

period with synchronous response.

Asynchronous to synchronous transition during Precharge Power Down (with DLL

frozen) exit (CL=6; AL=CL-1; CWL=5; tANPD=WL-1=9)

ODT_C

_sync

DRAM

_RTT_

C_sync

ODT_B

_tran

tAOFPDmax

tAOFPDmin

DRAM

_RTT_

B_tran

ODT_A

_async

DRAM_

RTT_A_

async

Ta0

Ta1

Ta2

Ta3

Ta4

Ta5

Ta6

Tb0

Tb1

Tb2

Tc0

Tc1

Tc2

Td0

Do not

care

Time

Break

Transitioning

Td1

CMD

NOP

CKE

NOP

tXPDLL

PD exit transition period

RTT

tAOFPDmin

ODTLoff + tAOFmax

ODTLoff + tAOFmin

tAOFPDmax

tANPD

NOP

tAOFmax

RTT

ODTLoff

tAOFmin

NT5CB128M8GP-EKB Datasheet(PDF) 82 Page - Nanya Technology Corporation.

NT5CB128M8GP-EKB Datasheet(HTML) 82 Page - Nanya Technology Corporation.

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 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL