IC42S16100 datasheet(34/78 Pages) ICSI

34 / 78 page

IC42S16100

Integrated Circuit Solution Inc.

DR024-0D 06/25/2004

Burst Data Interruption U/LDQM Pins

(Write Cycle)

Burst data input can be temporarily interrupted (muted )

during a write cycle using the U/LDQM pins. Regardless

of the CAS latency, as soon as one of the U/LDQM pins

goes HIGH, the corresponding externally applied input

data will no longer be written to the device internal circuits.

Subsequently, the corresponding input continues to be

muted as long as that U/LDQM pin remains HIGH.

The IC42S16100 will revert to accepting input as soon as

Burst Read and Single Write

The burst read and single write mode is set up using the

mode register set command. During this operation, the

burst read cycle operates normally, but the write cycle only

writes a single data item for each write cycle. The CAS

latency and DQM latency are the same as in normal mode.

that pin is dropped to LOW and data will be written to the

device. This input control operates independently on a

byte basis with the UDQM pin controlling upper byte input

(pin I/O8 to I/O15) and the LDQM pin controlling the lower

byte input (pins I/O0 to I/O7).

Since the U/LDQM pins control the device input buffers

only, the cycle continues internally and, inparticular,

incrementing of the internal burst counter continues.

WRITE A0

COMMAND

I/O

CLK

DIN A0

WRITE (CA=A, BANK 0)

WRITE A0

COMMAND

UDQM

LDQM

I/O8-I/O15

I/O0-I/O7

CLK

DIN A1

WRITE (CA=A, BANK 0)

DATA MASK (LOWER BYTE)

DATA MASK (UPPER BYTE)

tDMD=0

DIN A2

DIN A3

DIN A0

DIN A3

Don’t Care

CAS latency = 2, 3

CAS latency = 2, burst length = 4

IC42S16100 Folha de dados(PDF) 34 Page - Integrated Circuit Solution Inc

IC42S16100 Folha de dados(HTML) 34 Page - Integrated Circuit Solution Inc

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

Folha de dados Download

Ligação URL