參數(shù)資料
型號(hào): CYDC256B16-55AXI
廠商: CYPRESS SEMICONDUCTOR CORP
元件分類(lèi): DRAM
英文描述: 1.8V 4k/8k/16k x 16 and 8k/16k x 8 ConsuMoBL Dual-Port Static RAM
中文描述: 16K X 16 DUAL-PORT SRAM, 55 ns, PQFP100
封裝: 14 X 14 MM, 1.40 MM HEIGHT, LEAD FREE, PLASTIC, TQFP-100
文件頁(yè)數(shù): 20/26頁(yè)
文件大?。?/td> 580K
代理商: CYDC256B16-55AXI
CYDC256B16, CYDC128B16,
CYDC064B16, CYDC128B08,
CYDC064B08
Document #: 001-01638 Rev. *E
Page 20 of 26
Semaphore Read After Write Timing, Either Side
[49, 50]
Timing Diagram of Semaphore Contention
[51, 52]
Notes:
49.If the CE or SEM LOW transition occurs simultaneously with or after the R/W LOW transition, the outputs remain in the high-impedance state.
50.CE = HIGH for the duration of the above timing (both write and read cycle).
51.I/O
0R
= I/O
= LOW (request semaphore); CE
= CE
= HIGH.
52.If t
SPS
is violated, the semaphore will definitely be obtained by one side or the other, but which side will get the semaphore is unpredictable.
Switching Waveforms
(continued)
t
SOP
t
SAA
VALID ADRESS
VALID ADRESS
t
HD
DATA
IN
VALID
t
OHA
t
AW
t
HA
t
ACE
t
SOP
t
SCE
t
SD
t
SA
t
PWE
t
SWRD
t
DOE
WRITE CYCLE
READ CYCLE
OE
R/W
I/O
0
SEM
A
0
–A
2
DATA
OUT
VALID
MATCH
t
SPS
MATCH
R/W
L
SEM
L
R/W
R
SEM
R
A
0L
–A
2L
A
0R
–A
2R
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