DS_K7B803625B Datasheet, PDF (7/19 Pages) Samsung semiconductor – 256Kx36 & 512Kx18-Bit Synchronous Burst SRAM

K7B803625B
K7B801825B
256Kx36 & 512Kx18 Synchronous SRAM
TRUTH TABLES
SYNCHRONOUS TRUTH TABLE
CS1 CS2 CS2 ADSP ADSC ADV WRITE CLK ADDRESS ACCESSED
H
X
X
X
L
X
X
↑
N/A
L
L
X
L
X
X
X
↑
N/A
L
X
H
L
X
X
X
↑
N/A
L
L
X
X
L
X
X
↑
L
X
H
X
L
X
X
↑
L
H
L
L
X
X
X
↑
L
H
L
H
L
X
L
↑
N/A
N/A
External Address
External Address
L
H
L
H
L
X
H
↑
X
X
X
H
H
L
H
↑
H
X
X
X
H
L
H
↑
X
X
X
H
H
L
L
↑
External Address
Next Address
Next Address
Next Address
H
X
X
X
H
L
L
↑
X
X
X
H
H
H
H
↑
H
X
X
X
H
H
H
↑
X
X
X
H
H
H
L
↑
Next Address
Current Address
Current Address
Current Address
H
X
X
X
H
H
L
↑
Current Address
Notes : 1. X means "Don′t Care". 2. The rising edge of clock is symbolized by ↑.
3. WRITE = L means Write operation in WRITE TRUTH TABLE.
WRITE = H means Read operation in WRITE TRUTH TABLE.
4. Operation finally depends on status of asynchronous input pins(ZZ and OE).
OPERATION
Not Selected
Not Selected
Not Selected
Not Selected
Not Selected
Begin Burst Read Cycle
Begin Burst Write Cycle
Begin Burst Read Cycle
Continue Burst Read Cycle
Continue Burst Read Cycle
Continue Burst Write Cycle
Continue Burst Write Cycle
Suspend Burst Read Cycle
Suspend Burst Read Cycle
Suspend Burst Write Cycle
Suspend Burst Write Cycle
WRITE TRUTH TABLE( x36)
GW
BW
WEa
WEb
WEc
WEd
H
H
X
X
X
X
H
L
H
H
H
H
H
L
L
H
H
H
H
L
H
L
H
H
H
L
H
H
L
L
H
L
L
L
L
L
L
X
X
X
X
X
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
READ
WRITE BYTE a
WRITE BYTE b
WRITE BYTE c and d
WRITE ALL BYTEs
WRITE ALL BYTEs
WRITE TRUTH TABLE(x18)
GW
BW
WEa
WEb
H
H
X
X
H
L
H
H
H
L
L
H
H
L
H
L
H
L
L
L
L
X
X
X
OPERATION
READ
READ
WRITE BYTE a
WRITE BYTE b
WRITE ALL BYTEs
WRITE ALL BYTEs
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(↑).
-7-
Nov. 2003
Rev 3.0