DS_K7N803645B Datasheet, PDF (8/18 Pages) Samsung semiconductor – 256Kx36 & 512Kx18-Bit Pipelined NtRAMTM

K7N803645B
K7N801845B
256Kx36 & 512Kx18 Pipelined NtRAM^TM
TRUTH TABLES
SYNCHRONOUS TRUTH TABLE
CS1 CS2 CS2 ADV WE BWx OE CKE CLK
H
X
X
L
XXX
L
↑
X
L
X
L
XXX
L
↑
XXHL
XXX
L
↑
ADDRESS ACCESSED
N/A
N/A
N/A
XXXHXXX
L
↑
L
H
L
L
H
X
L
L
↑
X
X
X
H
X
X
L
L
↑
L
H
L
L
H
X
H
L
↑
N/A
External Address
Next Address
External Address
XXXHXXH
L
↑
L
H
L
L
L
L
X
L
↑
X
X
X
H
X
L
X
L
↑
L
H
L
L
LHX
L
↑
Next Address
External Address
Next Address
N/A
XXXHXHX
L
↑
X
X
X
X
X
X
X
H
↑
Next Address
Current Address
Notes : 1. X means "Don′t Care". 2. The rising edge of clock is symbolized by (↑).
3. A continue deselect cycle can only be enterd if a deselect cycle is executed first.
4. WRITE = L means Write operation in WRITE TRUTH TABLE.
WRITE = H means Read operation in WRITE TRUTH TABLE.
5. Operation finally depends on status of asynchronous input pins(ZZ and OE).
OPERATION
Not Selected
Not Selected
Not Selected
Not Selected Continue
Begin Burst Read Cycle
Continue Burst Read Cycle
NOP/Dummy Read
Dummy Read
Begin Burst Write Cycle
Continue Burst Write Cycle
NOP/Write Abort
Write Abort
Ignore Clock
WRITE TRUTH TABLE(x36)
WE
BWa
BWb
BWc
BWd
H
X
X
X
X
L
L
H
H
H
L
H
L
H
H
L
H
H
L
H
L
H
H
H
L
L
L
L
L
L
L
H
H
H
H
Notes : 1. X means "Don′t Care".
2. All inputs in this table must meet setup and hold time around the rising edge of CLK(↑).
WRITE TRUTH TABLE(x18)
WE
BWa
BWb
H
X
X
L
L
H
L
H
L
L
L
L
L
H
H
Notes : 1. X means "Don′t Care".
2. All inputs in this table must meet setup and hold time around the rising edge of CLK(↑).
OPERATION
READ
WRITE BYTE a
WRITE BYTE b
WRITE BYTE c
WRITE BYTE d
WRITE ALL BYTEs
WRITE ABORT/NOP
OPERATION
READ
WRITE BYTE a
WRITE BYTE b
WRITE ALL BYTEs
WRITE ABORT/NOP
-8-
Nov 2003
Rev 3.0