M66258 Mitsubishi, M66258 Datasheet - Page 11

• Manufacturer Part Number: M66258
• Description: 8192 x 8-BIT LINE MEMORY
• Manufacturer: Mitsubishi

Reading shortest n-cycle write data "n"
Reading longest n-cycle write data "n": 1 line delay
(Reading side n-1 cycle starts after the end of writing side n-1 cycle.)
(When writing side n-cycle <2>* starts, reading side n cycle <1>* then starts.)
When the reading side n-1 cycle starts before the end of the writing side n+1 cycle, output Qn of n cycle is made invalid.
In the following diagram, reading operation of n-1 cycle is invalid.
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.
WCK
RCK
WCK
Dn
Qn
RCK
Dn
Qn
(n-1)<1>*
(n-1)<0>*
n cycle <0>*
n cycle <1>*
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)
<0>*, <1>* and <2>* indicate value of lines.
n+3 cycle
MITSUBISHI <DIGITAL ASSP>
8192 x 8-BIT LINE MEMORY
(n-1)<2>*
(n-1)<1>*
n cycle
(n+3)
n cycle <2>*
n cycle <1>*
(n)
M66258FP
(n)<2>*
(n)<1>*
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