m66252fp Mitsumi Electronics, Corp., m66252fp Datasheet - Page 10

• Manufacturer Part Number: m66252fp
• Description: 1152 X 8-bit Line Memory Fifo
• Manufacturer: Mitsumi Electronics, Corp.

10
• Longest read of data “n” written in cycle n: 1-line delay
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>* over-
lap each other.
• Shortest read of data “n” written in cycle n
When the start of cycle n–1 on read side is earlier than the end of cycle n+1 on write side, output Qn of cycle n becomes invalid.
In the figure shown below, the read of cycle n–1 is invalid.
Cycle n–1 on read side should be started after end of cycle n+1 on write side
Cycle n <1>* on read side should be started when cycle n <2>* on write is started
WCK
D
RCK
Q
WCK
D
RCK
Q
n
n
n
n
(n – 1) 0
(n – 1) 1
Cycle n 1
Cycle n 0
Cycle n
(n) 0
(n)
(n) 1
Cycle n – 2
Cycle n+1
(n + 1)
Cycle 0 2
Cycle 0 1
Cycle n+2
Cycle n – 1
(0) 2
invalid
(0) 1
(n + 2)
Cycle n+3
(n – 1) 2
indicates a line value.
1152 x 8-BIT LINE MEMORY (FIFO)
0 , 1
Cycle n
(n – 1) 1
MITSUBISHI DIGITAL ASSP
(n + 3)
and 2
(n)
Cycle n 2
Cycle n 1
M66252P/FP
(n) 2
(n) 1