ic42s32800 ETC-unknow, ic42s32800 Datasheet - Page 17

• Manufacturer Part Number: ic42s32800
• Description: 2m X 32 Bit X 4 Banks 256-mbit Sdram
• Manufacturer: ETC-unknow

IC42S32800
IC42S32800L
Integrated Circuit Solution Inc.
DR046-0B 12/21/2004
Column Address
•
The Burst Type can be one of two modes,Interleave Mode or Sequential Mode.
A3
0
1
—Addressing Sequence of Sequential Mode
•
A column access is started in the input column address and is performed by inverting the address
bits in the sequence shown in the following table.
•
This field specifies the number of clock cycles from the assertion of the Read command to the first
read data.The minimum whole value of CAS#Latency depends on the frequency of CLK.The
minimum whole value satisfying the following formula must be programmed into this field.
t
Data n
Data 0
Data 1
Data 2
Data 3
Data 4
Data 5
Data 6
Data 7
CAC
Burst Length
(min)<=CAS#Latency X t
A6
0
0
0
0
1
Data n
Burst Type Field (A3)
Burst Type
Sequential
Interleave
An internal column address is performed by increasing the address from the column address which is input to the
device.The internal column address is varied by the Burst Length as shown in the following table.When the value
of column address,(n +m),in the table is larger than 255,only the least significant 8 bits are effective.
Addressing Sequence of Interleave Mode
CAS#Latency Field (A6~A4)
A5
0
0
1
1
X
A7
A7
A7
A7
A7
A7
A7
A7
A4
0
1
0
1
X
Full Page: Column address is repeated until terminated.
0
n
A6
A6
A6
A6
A6
A6
A6
A6
2 words:
4 words:
8 words:
Reserved
Reserved
2 clocks
3 clocks
Reserved
n+1
CAS#Latency
1
A5
A5
A5
A5
A5
A5
A5
A5
CK
n+2
2
Column Address
A4
A4
A4
A4
A4
A4
A4
A4
n+3
3
n+4
4
A3
A3
A3
A3
A3
A3
A3
A3
n+5
5
A2
A2
A2
A2
A2#
A2#
A2#
A2#
n+6
6
A1
A1
A1#
A1#
A1
A1
A1#
A1#
n+7
7
A0
A0#
A0
A0#
A0
A0#
A0
A0#
-
-
n+255
255
4 words
256
n
Burst Length
257
n+1
8 words
-
-
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