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GS8662T08E-333I датащи(PDF) 9 Page - GSI Technology

номер детали GS8662T08E-333I
подробное описание детали  72Mb SigmaCIO DDR-II Burst of 2 SRAM
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производитель  GSI [GSI Technology]
домашняя страница  http://www.gsitechnology.com
Logo GSI - GSI Technology

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Preliminary
GS8662T08/09/18/36E-333/300/267*/250/200/167
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
Rev: 1.01 9/2005
9/37
© 2005, GSI Technology
Special Functions
Byte Write and Nybble Write Control
Byte Write Enable pins are sampled at the same time that Data In is sampled. A high on the Byte Write Enable pin associated with
a particular byte (e.g., BW0 controls D0–D8 inputs) will inhibit the storage of that particular byte, leaving whatever data may be
stored at the current address at that byte location undisturbed. Any or all of the Byte Write Enable pins may be driven high or low
during the data in sample times in a write sequence.
Each write enable command and write address loaded into the RAM provides the base address for a 2 beat data transfer. The x18
version of the RAM, for example, may write 36 bits in association with each address loaded. Any 9-bit byte may be masked in any
write sequence.
Nybble Write (4-bit) write control is implemented on the 8-bit-wide version of the device. For the x8 version of the device,
“Nybble Write Enable” and “NBx” may be substituted in all the discussion above.
Example x18 RAM Write Sequence using Byte Write Enables
Data In Sample
Time
BW0
BW1
D0–D8
D9–D17
Beat 1
0
1
Data In
Don’t Care
Beat 2
1
0
Don’t Care
Data In
Byte 1
D0–D8
Byte 2
D9–D17
Byte 3
D0–D8
Byte 4
D9–D17
Written
Unchanged
Unchanged
Written
Beat 1
Beat 2
Resulting Write Operation
Output Register Control
SigmaCIO DDR-II SRAMs offer two mechanisms for controlling the output data registers. Typically, control is handled by the
Output Register Clock inputs, C and C. The Output Register Clock inputs can be used to make small phase adjustments in the firing
of the output registers by allowing the user to delay driving data out as much as a few nanoseconds beyond the next rising edges of
the K and K clocks. If the C and C clock inputs isare tied high, the RAM reverts to K and K control of the outputs, allowing the
RAM to function as a conventional pipelined read SRAM.


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