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| 型號(hào)： | CY7C0251-25AC |
| 英文描述： | SRAM|8KX18|CMOS|QFP|100PIN|PLASTIC |
| 中文描述： | 靜態(tài)存儲(chǔ)器| 8KX18 |的CMOS | QFP封裝| 100引腳|塑料 |
| 文件頁(yè)數(shù)： | 8/20頁(yè) |
| 文件大?。?/td> | 301K |
| 代理商： | CY7C0251-25AC |
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CY7C138AV/144AV/006AV
CY7C139AV/145AV/016AV
CY7C007AV/017AV
Document #: 38-06051 Rev. *A
Page 16 of 20
Table 1. Non-Contending Read/Write
Inputs
Outputs
CE
R/W
OE
SEM
I/O0–I/O8
Operation
H
X
H
High Z
Deselected: Power-Down
H
L
Data Out
Read Data in Semaphore Flag
X
H
X
High Z
I/O Lines Disabled
H
X
L
Data In
Write into Semaphore Flag
L
H
L
H
Data Out
Read
L
X
H
Data In
Write
L
X
L
Not Allowed
Table 2. Interrupt Operation Example (assumes BUSYL=BUSYR=HIGH)
Left Port
Right Port
Function
R/WL
CEL
OEL
A0L–14L
INTL
R/WR
CER
OER
A0R–14R
INTR
Set Right INTR Flag
L
X
FFF[45]
X
L[46]
Reset Right INTR Flag
X
L
FFF[45]
H[47]
Set Left INTL Flag
X
L[47]
L
X
1FFE[45]
X
Reset Left INTL Flag
X
L
1FFE[45]
H[46]
X
Table 3. Semaphore Operation Example
Function
I/O0–I/O8 Left
I/O0–I/O8 Right
Status
No action
1
Semaphore free
Left port writes 0 to semaphore
0
1
Left Port has semaphore token
Right port writes 0 to semaphore
0
1
No change. Right side has no write access to semaphore
Left port writes 1 to semaphore
1
0
Right port obtains semaphore token
Left port writes 0 to semaphore
1
0
No change. Left port has no write access to semaphore
Right port writes 1 to semaphore
0
1
Left port obtains semaphore token
Left port writes 1 to semaphore
1
Semaphore free
Right port writes 0 to semaphore
1
0
Right port has semaphore token
Right port writes 1 to semaphore
1
Semaphore free
Left port writes 0 to semaphore
0
1
Left port has semaphore token
Left port writes 1 to semaphore
1
Semaphore free
Note:
45. See Functional Description for specific addresses by device part number.
46. If BUSYL = L, then no change.
47. If BUSYR = L, then no change.
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| CY7C0251-25AI | 制造商:CYPRESS 制造商全稱(chēng):Cypress Semiconductor 功能描述:4K x 16/18 and 8K x 16/18 Dual-Port Static RAM with SEM, INT, BUSY |
| CY7C0251-25AXC | 功能描述:IC SRAM 144KBIT 25NS 100LQFP RoHS:是 類(lèi)別:集成電路 (IC) >> 存儲(chǔ)器 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 格式 - 存儲(chǔ)器:RAM 存儲(chǔ)器類(lèi)型:移動(dòng) SDRAM 存儲(chǔ)容量:256M（8Mx32） 速度:133MHz 接口:并聯(lián) 電源電壓:1.7 V ~ 1.95 V 工作溫度:-40°C ~ 85°C 封裝/外殼:90-VFBGA 供應(yīng)商設(shè)備封裝:90-VFBGA（8x13） 包裝:帶卷 (TR) 其它名稱(chēng):557-1327-2 |
| CY7C0251-25AXI | 制造商:CYPRESS 制造商全稱(chēng):Cypress Semiconductor 功能描述:4K x 16/18 and 8K x 16/18 Dual-Port Static RAM with SEM, INT, BUSY |
| CY7C0251-35AC | 制造商:CYPRESS 制造商全稱(chēng):Cypress Semiconductor 功能描述:4K x 16/18 and 8K x 16/18 Dual-Port Static RAM with SEM, INT, BUSY |
| CY7C0251-35AI | 制造商:CYPRESS 制造商全稱(chēng):Cypress Semiconductor 功能描述:4K x 16/18 and 8K x 16/18 Dual-Port Static RAM with SEM, INT, BUSY |
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