Cypress CY7C144E：8K×8双端口静态RAM，带仲裁和信号功能
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"CYPRESS-CY7C144E-55JXC.pdf 是 Cypress Semiconductor Corporation 生产的一款8K×8双口静态RAM，具备同时读取相同内存位置的真正双端口存储单元、0.35微米CMOS工艺、15ns高速访问、低功耗操作以及多种功能特性，适用于需要高效能和高并发数据处理的应用场景。"
该器件的主要特点包括：
1. **真正双端口内存单元**：CY7C144E具有真正的双端口内存设计，允许两个独立的读写端口在同一时刻对同一内存位置进行读取或写入操作，提高了数据访问效率。
2. **8K×8组织结构**：该芯片的存储容量为8K字节（即64K位），每字节包含8位，提供充足的存储空间。
3. **0.35微米CMOS工艺**：采用先进的0.35微米CMOS工艺，确保了高速度和低功耗的性能。
4. **高速访问**：数据访问速度达到15ns，满足高速数据处理的需求。
5. **低功耗**：正常工作时的电流消耗为180mA（典型值），待机状态下电流消耗仅为0.05mA（典型值）。
6. **完全异步操作**：所有操作与系统时钟无关，提高系统的灵活性。
7. **自动电源关闭**：在无活动时，器件能够自动进入低功耗模式，节省能源。
8. **TTL兼容**：与TTL逻辑电平兼容，方便与其他TTL电路集成。
9. **主/从选择引脚**：支持主/从模式，可扩展总线宽度至16位或更大，便于构建更宽的数据通道。
10. **仲裁机制**：内置仲裁策略，处理多个处理器同时访问相同数据的情况，避免冲突。
11. **信号量（Semaphore）**：通过信号量实现端口间的软件握手，确保数据访问的有序性。
12. **INT标志**：提供了端口间通信的中断标志，用于通知端口状态变化。
13. **封装选项**：提供68引脚PLCC和64引脚TQFP两种封装形式，适应不同设计需求。
14. **无铅封装**：也有无铅封装版本，符合环保要求。
CY7C144E是一款高性能、低功耗的8K×8双端口静态RAM，适用于需要高速、并发数据处理的嵌入式系统，如多处理器系统、通信设备和实时控制系统等。其丰富的功能和灵活的设计使其成为解决复杂数据同步和共享问题的理想选择。
CY7C144E
Document Number: 001-63982 Rev. *E Page 5 of 23
Functional Overview
Write Operation
Data must be set up for a duration of t
SD
before the rising edge
of R / W
to guarantee a valid write. A write operation is controlled
by either the OE
pin (see Figure 7 on page 12) or the R/W pin
(see Figure 8 on page 12). Data can be written to the device
t
HZOE
after the OE is deasserted or t
HZWE
after the falling edge
of R/W
. Required inputs for non-contention operations are
summarized in Table 1.
If a location is being written to by one port and the opposite port
attempts to read that location, a port-to-port flowthrough delay
must be met before the data is read on the output; otherwise the
data read is not deterministic. Data will be valid on the port t
DDD
after the data is presented on the other port.
Read Operation
When reading the device, the user must assert both the OE and
CE
pins. Data will be available t
ACE
after CE or t
DOE
after OE are
asserted. If the user of the CY7C144E wishes to access a
semaphore flag, then the SEM
pin must be asserted instead of
the CE
pin.
Interrupts
The interrupt flag (INT) permits communications between
ports.When the left port writes to location 1FFF, the right port’s
interrupt flag (INT
R
) is set. This flag is cleared when the right port
reads that same location. Setting the left port’s interrupt flag
(INT
L
) is accomplished when the right port writes to location
1FFE. This flag is cleared when the left port reads the specified
location 1FFE. The message at 1FFF or 1FFE is user-defined.
See Table 2 for input requirements for INT
. INT
R
and INT
L
are
push-pull outputs and do not require pull-up resistors to operate.
Busy
The CY7C144E provides on-chip arbitration to alleviate
simultaneous memory location access (contention). If both ports’
CEs are asserted and an address match occurs within t
PS
of
each other the Busy logic determines which port has access. If
t
PS
is violated, one port will definitely gain permission to the
location, but it is not guaranteed which one. BUSY
will be
asserted t
BLA
after an address match or t
BLC
after CE is taken
LOW. BUSY
L
and BUSY
R
in master mode are push-pull outputs
and do not require pull-up resistors to operate.
Table 1. Non-Contending Read/Write
Inputs Outputs
Operation
CE R/W OE SEM I/O
07
H X X H High Z Power-down
H H L L Data out Read data in semaphore
X X H X High Z I/O lines disabled
H X L Data in Write to semaphore
LHLH Data outRead
LLXH Data inWrite
L X X L Illegal condition
Table 2. Interrupt Operation Example (assumes BUSY
L
= BUSY
R
= HIGH)
Function
Left Port Right Port
R/W CE OE A
012
(CY7C144E) INT R/W CE OE A
012
(CY7C144E) INT
Set left INT XXX X LLLX 1FFE X
Reset left INT
XLL 1FFE HXLL X X
Set right INT
LLX 1FFF XXXX X L
Reset right INT
XXX X XXLL 1FFF H
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