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| 型号： | IDT70T631S |
| 厂商： | Integrated Device Technology, Inc. |
| 英文描述： | 122 x 32 pixel format, Compact LCD size |
| 中文描述： | 高速2.5V的512/256K与3.3V 5011 2.5V的接口× 18 ASYNCHRONO美国双端口静态RAM |
| 文件页数： | 21/27页 |
| 文件大小： | 342K |
| 代理商： | IDT70T631S |
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21
IDT70T633/1S
High-Speed 2.5V 512/256K x 18 Asynchronous Dual-Port Static RAM Industrial and Commercial Temperature Ranges
Truth Table IV —
Address
BUSY
Arbitration
Inputs
Outputs
Preliminary
Functional Description
The IDT70T633/1 provides two ports with separate control, address
and I/O pins that permit independent access for reads or writes to any
location in memory. The IDT70T633/1 has an automatic power down
feature controlled by
CE
. The
CE
0
and CE
1
control the on-chip power
down circuitry that permits the respective port to go into a standby mode
when not selected (
CE
= HIGH). When a port is enabled, access to the
entire memory array is permitted.
Interrupts
If the user chooses the interrupt function, a memory location (mail
box or message center) is assigned to each port. The left port interrupt
flag (
INT
L
) is asserted when the right port writes to memory location
7FFFE (HEX), where a write is defined as
CE
R
= R/
W
R
= V
IL
per the
Truth Table. The left port clears the interrupt through access of
address location 7FFFE when
CE
L
=
OE
L
= V
IL
, R/
W
is a "don't care".
Likewise, the right port interrupt flag (
INT
R
) is asserted when the left
port writes to memory location 7FFFF (HEX) and to clear the interrupt
flag (
INT
R
), the right port must read the memory location 7FFFF. The
message (18 bits) at 7FFFE or 7FFFF (3FFFF or 3FFFE for IDT70T631)
is user-defined since it is an addressable SRAM location. If the interrupt
function is not used, address locations 7FFFE and 7FFFF are not used
as mail boxes, but as part of the random access memory. Refer to Truth
Table III for the interrupt operation.
NOTES:
1. Pins
BUSY
L
and
BUSY
R
are both outputs when the part is configured as a master. Both are inputs when configured as a slave.
BUSY
outputs on the
IDT70T633/1 are push-pull, not open drain outputs. On slaves the
BUSY
input internally inhibits writes.
2. "L" if the inputs to the opposite port were stable prior to the address and enable inputs of this port. "H" if the inputs to the opposite port became stable after the address
and enable inputs of this port. If t
APS
is not met, either
BUSY
L
or
BUSY
R
= LOW will result.
BUSY
L
and
BUSY
R
outputs can not be LOW simultaneously.
3. Writes to the left port are internally ignored when
BUSY
L
outputs are driving LOW regardless of actual logic level on the pin. Writes to the right port are internally ignored
when
BUSY
R
outputs are driving LOW regardless of actual logic level on the pin.
4. A
18
is a NC for IDT70T631. Address comparison will be for A
0
- A
17
.
5.
CE
X
= L means
CE
0
X
= V
IL
and CE
1
X
= V
IH
.
CE
X
= H means
CE
0
X
= V
IH
and/or CE
1
X
= V
IL
.
Truth Table V — Example of Semaphore Procurement Sequence
(1,2,3)
Functions
D
0
- D
17
Left
D
0
- D
17
Right
NOTES:
1. This table denotes a sequence of events for only one of the eight semaphores on the IDT70T633/1.
2. There are eight semaphore flags written to via I/O
0
and read from all I/O's (I/O
0
-I/O
17
). These eight semaphores are addressed by A
0
- A
2
.
3.
CE
0
= V
IH
, CE
1
=
SEM
= V
IL
to access the semaphores. Refer to the Semaphore Read/Write Control Truth Table.
Function
CE
L
(5)
CE
R
(5)
A
0L
-A
18L
(4)
A
0R
-A
18R
BUSY
L
(1)
BUSY
R
(1)
X
X
NO MATCH
H
H
Normal
H
X
MATCH
H
H
Normal
X
H
MATCH
H
H
Normal
L
L
MATCH
(2)
(2)
Write Inhibit
(3)
5670 tbl 18
Status
No Action
1
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
1
Semaphore free
Right Port Writes "0" to Semaphore
1
0
Right port has semaphore token
Right Port Writes "1" to Semaphore
1
1
Semaphore free
Left Port Writes "0" to Semaphore
0
1
Left port has semaphore token
Left Port Writes "1" to Semaphore
1
1
Semaphore free
5670 tbl 19
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IDT70T631S10BC | 功能描述:IC SRAM 4MBIT 10NS 256BGA RoHS:否 类别:集成电路 (IC) >> 存储器 系列:- 标准包装:3,000 系列:- 格式 - 存储器:EEPROMs - 串行 存储器类型:EEPROM 存储容量:8K (1K x 8) 速度:400kHz 接口:I²C，2 线串口 电源电压:1.7 V ~ 5.5 V 工作温度:-40°C ~ 85°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商设备封装:8-SOIC 包装:带卷 (TR) |
| IDT70T631S10BC8 | 功能描述:IC SRAM 4MBIT 10NS 256BGA RoHS:否 类别:集成电路 (IC) >> 存储器 系列:- 标准包装:3,000 系列:- 格式 - 存储器:EEPROMs - 串行 存储器类型:EEPROM 存储容量:8K (1K x 8) 速度:400kHz 接口:I²C，2 线串口 电源电压:1.7 V ~ 5.5 V 工作温度:-40°C ~ 85°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商设备封装:8-SOIC 包装:带卷 (TR) |
| IDT70T631S10BCI | 功能描述:IC SRAM 4MBIT 10NS 256BGA RoHS:否 类别:集成电路 (IC) >> 存储器 系列:- 标准包装:3,000 系列:- 格式 - 存储器:EEPROMs - 串行 存储器类型:EEPROM 存储容量:8K (1K x 8) 速度:400kHz 接口:I²C，2 线串口 电源电压:1.7 V ~ 5.5 V 工作温度:-40°C ~ 85°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商设备封装:8-SOIC 包装:带卷 (TR) |
| IDT70T631S10BCI8 | 功能描述:IC SRAM 4MBIT 10NS 256BGA RoHS:否 类别:集成电路 (IC) >> 存储器 系列:- 标准包装:3,000 系列:- 格式 - 存储器:EEPROMs - 串行 存储器类型:EEPROM 存储容量:8K (1K x 8) 速度:400kHz 接口:I²C，2 线串口 电源电压:1.7 V ~ 5.5 V 工作温度:-40°C ~ 85°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商设备封装:8-SOIC 包装:带卷 (TR) |
| IDT70T631S10BF | 功能描述:IC SRAM 4MBIT 10NS 208FBGA RoHS:否 类别:集成电路 (IC) >> 存储器 系列:- 标准包装:3,000 系列:- 格式 - 存储器:EEPROMs - 串行 存储器类型:EEPROM 存储容量:8K (1K x 8) 速度:400kHz 接口:I²C，2 线串口 电源电压:1.7 V ~ 5.5 V 工作温度:-40°C ~ 85°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商设备封装:8-SOIC 包装:带卷 (TR) |
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