EtronTech
EM63A165
Data 5 A8
A0#
A7
A7
A7
A6
A6
A6
A5
A5
A5
A4
A4
A4
A3
A3
A3
A2#
A2#
A2#
A1
Data 6 A8
A0
A1#
A1#
Data 7 A8
A0#
CAS# Latency Field (A6~A4)
•
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.
tCAC(min) ≤ CAS# Latency X tCK
A6
0
A5
0
A4
0
CAS# Latency
Reserved
Reserved
2 clocks
0
0
1
0
1
0
0
1
1
3 clocks
1
X
X
Reserved
Write Burst Length (A9)
•
This bit is used to select the burst write length.
A9
0
Write Burst Length
Burst
1
Single Bit
9
No-Operation command
(RAS# = "H", CAS# = "H", WE# = "H")
The No-Operation command is used to perform a NOP to the SDRAM which is selected (CS#
is Low). This prevents unwanted commands from being registered during idle or wait states.
14
Rev 1.1 Apr. 2007
ETRON [ ETRON TECHNOLOGY, INC. ]
