Cypress Semiconductor CY7C138 Ficha de especificações - Página 14

Procurar online ou descarregar pdf Ficha de especificações para Hardware informático Cypress Semiconductor CY7C138. Cypress Semiconductor CY7C138 18 páginas. 4k x 8/9 dual-port static ram with sem, int, busy

Imprimir página
Table 3. Non-Contending Read/Write
Inputs
CE
R/W
H
X
H
H
X
X
H
L
H
L
L
L
X
Table 4. Interrupt Operation Example (assumes BUSY
Function
Set Left INT
Reset Left INT
Set Right INT
Reset Right INT
Table 5. Semaphore Operation Example
Function
No action
Left port writes 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
Document #: 38-06037 Rev. *D
OE
SEM
X
H
High Z
L
L
Data Out
H
X
High Z
X
L
Data In
L
H
Data Out
X
H
Data In
X
L
=BUSY
L
R/W
CE
X
X
X
L
L
L
X
X
I/O
Left
0-7/8
1
0
0
1
1
0
1
1
1
0
1
Outputs
I/O
0-7/8
Power-Down
Read Data in Semaphore
I/O Lines Disabled
Write to Semaphore
Read
Write
Illegal Condition
=HIGH)
R
Left Port
OE
A
INT
R/W
0-11
X
X
L
L
L
FFE
H
X
X
FFF
X
X
X
X
X
X
I/O
Right
0-7/8
1
Semaphore free
1
Left port obtains semaphore
1
Right side is denied access
0
Right port is granted access to semaphore
0
No change. Left port is denied access
1
Left port obtains semaphore
1
No port accessing semaphore address
0
Right port obtains semaphore
1
No port accessing semaphore
1
Left port obtains semaphore
1
No port accessing semaphore
CY7C138, CY7C139
Operation
Right Port
CE
OE
A
INT
0-11
L
X
FFE
X
X
X
X
X
X
X
X
L
L
L
FFF
H
Status
Page 14 of 17
[+] Feedback