m66281fp Renesas Electronics Corporation., m66281fp Datasheet - Page 13

• Manufacturer Part Number: m66281fp
• Description: 5120 ? 8-bit ? 2 Line Memory
• Manufacturer: Renesas Electronics Corporation.

M66281FP
Reading Shortest n-cycle Write Data "n"
(Reading side n − 2 cycle ends after the end of writing side n + 1 cycle)
When the reading side n − 2 cycle ends before the end of the writing side n + 1 cycle, output Qn of n cycle is made
invalid. In the following diagram, end of reading side n − 2 cycle and end of writing side n + 1 cycle overlap each other.
This example can read n cycle data in the shortest time. When this is the case, reading operation at n − 1 cycle is
invalid.
Reading Longest n-cycle Write Data "n": 1 Line Delay
(When writing side n-cycle <2> starts, reading side n cycle <1> then starts)
Output Qn of n cycle <1>* can be read until the start of reading side n cycle <1> and the start of writing side n cycle
<2>* overlap each other.
Note: <0>*, <1>* and <2>* indicate value of lines.
REJ03F0254-0200 Rev.2.00 Sep 14, 2007
Page 13 of 15
WCK
Dn
RCK
Q0n
(Q1n)
WCK
Dn
RCK
Q0n
(Q1n)
(n − 1) <1>*
(n − 1) <0>*
n cycle <1>*
n cycle <0>*
n cycle
(n) <1>*
(n) <0>*
(n)
n − 2 cycle
n + 1 cycle
(n +1)
0 cycle <2>*
0 cycle <1>*
n + 2 cycle
n − 1 cycle
(0) <2>*
(0) <1>*
Invalid
(n + 2)
n + 3 cycle
(n − 1) <2>*
(n − 1) <1>*
n cycle
(n + 3)
n cycle <2>*
n cycle <1>*
(n)
(n) <2>*
(n) <1>*