K1B6416B6C Datasheet, PDF (14/46 Pages) Samsung semiconductor – 4Mx16 bit Synchronous Burst Uni-Transistor Random Access Memory

K1B6416B6C
UtRAM
SYNCHRONOUS BURST OPERATION TERMINOLOGY
Clock(CLK)
The clock input is used as the reference for synchronous burst read and write operation of UtRAM. The synchronous burst read and
write operation is synchronized to the rising edge of the clock. The clock transitions must swing between VIL and VIH.
Latency Count
The Latency Count configuration tells the device how many clocks must elapse from the burst command before the first data should
be available on its data pins. This value depends on the input clock frequency.
The supported Latency Count is as follows.
Table 9. Latency Count support : 3, 4, 5
Clock Frequency
Latency Count
Upto 66MHz
5
Table 10. Number of Clocks for 1st Data
Set Latency
# of Clocks for 1st data(Read)
# of Clocks for 1st data(Write)
Latency 3
4
2
Upto 54MHz
4
Latency 4
5
3
Upto 40MHz
3
Latency 5
6
4
Fig.10 Latency Configuration(Read)
T
Clock
ADV
Address
Data out
Data out
Data out
Data out
Latency 3
Latency 4
Latency 5
Latency 6
DQ1 DQ2 DQ3 DQ4 DQ5 DQ6 DQ7 DQ8 DQ9
DQ1 DQ2 DQ3 DQ4 DQ5 DQ6 DQ7 DQ8
DQ1 DQ2 DQ3 DQ4 DQ5 DQ6 DQ7
DQ1 DQ2 DQ3 DQ4 DQ5 DQ6
NOTE : The first data will always keep the Latency. From the second data, some period of wait time might be caused by WAIT pin.
Burst Length
Burst Length identifies how many data the device outputs at an access. The device supports 4 word, 8 word, 16 word and 256 word
burst read or write. 256 word Full page burst mode needs to meet tBC(Burst Cycle time) parameter as max. 2500ns.
The first data will be out with the set Latency + tCD. From the second data, the data will be out with tCD from each clock.
Burst Stop
Burst stop is used when the system wants to stop burst operation on special purpose. If driving CS to VIH during the burst read opera-
tion, then the burst operation will be stopped. During the burst read operation, the new burst operation can not be issued. The new
burst operation can be issued only after the previous burst operation is finished.
The burst stop feature is very useful because it enables the user to utilize the un-supported burst length such as 1 burst or 2 burst
which accounts for big portion in usage for the mobile handset application environment.
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Revision 1.0
January 2005