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コンピュータ・ハードウェア Cypress Semiconductor CY7C138のPDF 仕様書をオンラインで閲覧またはダウンロードできます。Cypress Semiconductor CY7C138 18 ページ。 4k x 8/9 dual-port static ram with sem, int, busy
ページを印刷するSwitching Waveforms
SEM or CE
OE
DATA OUT
t
PU
I
CC
I
SB
ADDRESS
R
R/W
R
DATA
INR
ADDRESS
L
DATA
OUTL
Notes
16. R/W is HIGH for read cycle.
17. Device is continuously selected CE = LOW and OE = LOW. This waveform cannot be used for semaphore reads.
18. Address valid prior to or coincident with CE transition LOW.
19. CE
= L, SEM = H when accessing RAM. CE = H, SEM = L when accessing semaphores.
L
Figure 6. Write Cycle No. 1: OE Three-States Data I/Os (Either Port)
Document #: 38-06037 Rev. *D
(continued)
t
ACE
t
DOE
t
LZOE
t
LZCE
Figure 5. Read Timing with Port-to-Port Delay (M/S = L)
t
WC
MATCH
MATCH
t
HZOE
DATA VALID
[20, 21]
t
PWE
t
t
SD
HD
VALID
t
DDD
t
WDD
CY7C138, CY7C139
t
HZCE
t
PD
VALID
[22, 23, 24]
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