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| 型号： | IDT70T659S10BC |
| 厂商： | IDT, Integrated Device Technology Inc |
| 文件页数： | 22/27页 |
| 文件大小： | 0K |
| 描述： | IC SRAM 4MBIT 10NS 256BGA |
| 标准包装： | 6 |
| 格式 - 存储器： | RAM |
| 存储器类型： | SRAM - 双端口，异步 |
| 存储容量： | 4.5M（128K x 36） |
| 速度： | 10ns |
| 接口： | 并联 |
| 电源电压： | 2.4 V ~ 2.6 V |
| 工作温度： | 0°C ~ 70°C |
| 封装/外壳： | 256-LBGA |
| 供应商设备封装： | 256-CABGA（17x17） |
| 包装： | 托盘 |
| 其它名称： | 70T659S10BC |
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IDT70T651/9S
High-Speed 2.5V 256/128K x 36 Asynchronous Dual-Port Static RAM
as mail boxes, but as part of the random access memory. Refer to Truth
Industrial and Commercial Temperature Ranges
The BUSY arbitration on a master is based on the chip enable and
Table III for the interrupt operation.
Busy Logic
Busy Logic provides a hardware indication that both ports of the RAM
have accessed the same location at the same time. It also allows one of the
two accesses to proceed and signals the other side that the RAM is “Busy”.
The BUSY pin can then be used to stall the access until the operation on
the other side is completed. If a write operation has been attempted from
the side that receives a BUSY indication, the write signal is gated internally
to prevent the write from proceeding.
The use of BUSY logic is not required or desirable for all applications.
In some cases it may be useful to logically OR the BUSY outputs together
and use any BUSY indication as an interrupt source to flag the event of
an illegal or illogical operation. If the write inhibit function of BUSY logic is
not desirable, the BUSY logic can be disabled by placing the part in slave
mode with the M/ S pin. Once in slave mode the BUSY pin operates solely
as a write inhibit input pin. Normal operation can be programmed by tying
the BUSY pins HIGH. If desired, unintended write operations can be
prevented to a port by tying the BUSY pin for that port LOW.
The BUSY outputs on the IDT70T651/9 RAM in master mode, are
push-pull type outputs and do not require pull up resistors to operate.
A 18
address signals only. It ignores whether an access is a read or write.
In a master/slave array, both address and chip enable must be valid
long enough for a BUSY flag to be output from the master before the
actual write pulse can be initiated with the R/ W signal. Failure to
observe this timing can result in a glitched internal write inhibit signal
and corrupted data in the slave.
Semaphores
The IDT70T651/9 is an extremely fast Dual-Port 256/128K x 36
CMOS Static RAM with an additional 8 address locations dedicated to
binary semaphore flags. These flags allow either processor on the left or
right side of the Dual-Port RAM to claim a privilege over the other processor
for functions defined by the system designer’s software. As an ex-
ample, the semaphore can be used by one processor to inhibit the
other from accessing a portion of the Dual-Port RAM or any other
shared resource.
The Dual-Port RAM features a fast access time, with both ports
being completely independent of each other. This means that the
activity on the left port in no way slows the access time of the right port.
Both ports are identical in function to standard CMOS Static RAM and
can be read from or written to at the same time with the only possible
conflict arising from the simultaneous writing of, or a simultaneous
READ/WRITE of, a non-semaphore location. Semaphores are pro-
MASTER
Dual Port RAM
CE 0
SLAVE
Dual Port RAM
CE 0
tected against such ambiguous situations and may be used by the
system program to avoid any conflicts in the non-semaphore portion
BUSY L
BUSY R
BUSY L
BUSY R
of the Dual-Port RAM. These devices have an automatic power-down
feature controlled by CE 0 and CE 1 , the Dual-Port RAM chip enables, and
SEM , the semaphore enable. The CE 0 , CE 1 , and SEM pins control on-
MASTER
Dual Port RAM
CE 1
SLAVE
Dual Port RAM
CE 1
chip power down circuitry that permits the respective port to go into standby
mode when not selected.
BUSY L
BUSY R
BUSY L
BUSY R
Systems which can best use the IDT70T651/9 contain multiple
processors or controllers and are typically very high-speed systems
5632 drw 20
Figure 3. Busy and chip enable routing for both width and depth
expansion with IDT70T651/9 Dual-Port RAMs.
.
which are software controlled or software intensive. These systems
can benefit from a performance increase offered by the IDT70T651/9s
hardware semaphores, which provide a lockout mechanism without
requiring complex programming.
If these RAMs are being expanded in depth, then the BUSY indication
for the resulting array requires the use of an external AND gate.
Width Expansion with Busy Logic
Master/Slave Arrays
When expanding an IDT70T651/9 RAM array in width while using
BUSY logic, one master part is used to decide which side of the RAMs
array will receive a BUSY indication, and to output that indication. Any
number of slaves to be addressed in the same address range as the
master use the BUSY signal as a write inhibit signal. Thus on the
IDT70T651/9 RAM the BUSY pin is an output if the part is used as a
master (M/ S pin = V IH ), and the BUSY pin is an input if the part used
as a slave (M/ S pin = V IL ) as shown in Figure 3.
If two or more master parts were used when expanding in width, a
split decision could result with one master indicating BUSY on one side
of the array and another master indicating BUSY on one other side of
the array. This would inhibit the write operations from one port for part
of a word and inhibit the write operations from the other port for the
other part of the word.
22
Software handshaking between processors offers the maximum in
system flexibility by permitting shared resources to be allocated in
varying configurations. The IDT70T651/9 does not use its semaphore
flags to control any resources through hardware, thus allowing the
system designer total flexibility in system architecture.
An advantage of using semaphores rather than the more common
methods of hardware arbitration is that wait states are never incurred
in either processor. This can prove to be a major advantage in very
high-speed systems.
How the Semaphore Flags Work
The semaphore logic is a set of eight latches which are indepen-
dent of the Dual-Port RAM. These latches can be used to pass a flag,
or token, from one port to the other to indicate that a shared resource
is in use. The semaphores provide a hardware assist for a use
assignment method called “Token Passing Allocation.” In this method,
the state of a semaphore latch is used as a token indicating that a
shared resource is in use. If the left processor wants to use this
resource, it requests the token by setting the latch. This processor then
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| IDT70T659S10BC8 | 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) |
| IDT70T659S10BCI | 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) |
| IDT70T659S10BCI8 | 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) |
| IDT70T659S10BF | 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) |
| IDT70T659S10BF8 | 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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