m66220sp Mitsumi Electronics, Corp., m66220sp Datasheet - Page 9

• Manufacturer Part Number: m66220sp
• Description: 256 X 8-bit Mail-box
• Manufacturer: Mitsumi Electronics, Corp.

Contention Read Cycle (WE = V
Contention read cycle No.1 (Address control) See Notes 10 and 11.
Contention read cycle No.2 (CS control) See Notes 10 and 12.
(Address B)
(Address A)
(Not Ready A)
(I/O
Addresses
A & B
(CSB)
(CSA)
(Not Ready A)
(I/O
Address A
Address B
Not Ready B
I/O
CSA
CSB
Not Ready B
I/O
0
0
0
0
B~I/O
A~I/O
B~I/O
A~I/O
7
7
7
7
B
A)
B
A)
Notes 10: The Not Ready output of the first-in port holds “H”.
11:
12:
Previous cycle data
When CS is set to “L” before the address input is determined.
When the address input is determined before CS transition to “L”.
t
APS
IH
t
APS
Address A = Address B
, OE = V
Address A = Address B
Address matching
IL
t
v(A)
t
)
t
en(CS)
NAA
t
NAC
Address matching
t
a(CS)
t
a(A)
t
NDC
t
NDA
Address not matching
MITSUBISHI DIGITAL ASSP
t
NO
t
NO
Data output determined
M66220SP/FP
Data output determined
256
8-BIT MAIL-BOX
9