Cypress Semiconductor CY7C024BV Arkusz specyfikacji - Strona 7

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Table 1. Non-Contending Read/Write
Inputs
CE
R/W
OE
UB
H
X
X
X
X
X
L
L
X
L
L
X
L
L
X
L
H
L
L
H
L
L
H
L
X
X
H
H
H
L
X
H
L
H
X
X
X
L
X
X
L
X
X
Table 2. Interrupt Operation Example (assumes BUSY
Function
R/W
Set Right INT
Flag
L
R
Reset Right INT
Flag
X
R
Set Left INT
Flag
X
L
Reset Left INT
Flag
X
L
Table 3. Semaphore Operation Example
Function
No action
Left port writes 0 to semaphore
Right port writes 0 to semaphore
Left port writes 1 to semaphore
Left port writes 0 to semaphore
Right port writes 1 to semaphore
Left port writes 1 to semaphore
Right port writes 0 to semaphore
Right port writes 1 to semaphore
Left port writes 0 to semaphore
Left port writes 1 to semaphore
Notes
10. See
Functional Description
on page 5 for specific highest memory locations by device.
11. If BUSY
=L, then no change.
R
12. If BUSY
=L, then no change.
L
13. See
Functional Description
on page 5 for specific addresses by device.
Document #: 38-06052 Rev. *J
LB
SEM
X
X
H
High Z
H
H
H
High Z
L
H
H
Data In
H
L
H
High Z
L
L
H
Data In
L
H
H
Data Out
H
L
H
High Z
L
L
H
Data Out
X
X
X
High Z
X
X
L
Data Out
H
H
L
Data Out
X
X
L
Data In
H
H
L
Data In
L
X
L
X
L
L
L
Left Port
CE
OE
A
L
L
L
0L–13L
L
X
FFF
X
X
X
X
X
X
L
L
1FFE
IO
–IO
Left
IO
–IO
0
17
0
17
1
1
0
1
0
1
1
0
1
0
0
1
1
1
1
0
1
1
0
1
1
1
CY7C024AV/024BV/025AV/026AV
CY7C0241AV/0251AV/036AV
Outputs
IO
–IO
IO
–IO
9
17
0
8
High Z
High Z
High Z
Data In
Data In
High Z
Data Out
Data Out
High Z
Data Out
Data Out
Data In
Data In
[10]
= BUSY
= HIGH)
R
INT
R/W
CE
L
R
[13]
X
X
X
X
X
L
[11]
L
L
L
[13]
[12]
H
X
X
Right
Semaphore-free
Left Port has semaphore token
No change. Right side has no write access to semaphore
Right port obtains semaphore token
No change. Left port has no write access to semaphore
Left port obtains semaphore token
Semaphore-free
Right port has semaphore token
Semaphore free
Left port has semaphore token
Semaphore-free
Operation
Deselected: Power Down
Deselected: Power Down
Write to Upper Byte Only
Write to Lower Byte Only
Write to Both Bytes
Read Upper Byte Only
Read Lower Byte Only
Read Both Bytes
Outputs Disabled
Read Data in Semaphore Flag
Read Data in Semaphore Flag
Write D
into Semaphore Flag
IN0
Write D
into Semaphore Flag
IN0
Not Allowed
Not Allowed
Right Port
OE
A
R
R
0R–13R
X
X
L
FFF (or 1/3FFF)
X
1FFE (or 1/3FFE)
X
X
Status
INT
R
[12]
L
[11]
H
X
X
Page 7 of 19
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