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參數(shù)資料
| 型號(hào)： | CM42-67025V-55 |
| 廠商： | ATMEL CORP |
| 元件分類： | SRAM |
| 英文描述： | 8K X 16 DUAL-PORT SRAM, 55 ns, CQCC84 |
| 封裝： | LCC-84 |
| 文件頁數(shù)： | 22/23頁 |
| 文件大?。?/td> | 257K |
| 代理商： | CM42-67025V-55 |
M 67025
MATRA MHS
Rev. D (29/09/95)
8
semaphores are used, both the CPU and the I/0 device can
access assigned memory segments, without the need for
wait states, once the two devices have determined which
memory area is barred to the CPU.
Semaphores are also useful in applications where no
memory WAIT state is available on one or both sides. On
a semaphore handshake has been performed, both
processors can access their assigned RAM segments at
full speed.
Another application is in complex data structures. Block
arbitration is very important in this case, since one
processor may be responsible for building and updating
a data structure whilst the other processor reads and
interprets it. A major error condition may be created if the
interpreting processor reads an incomplete data structure.
Some sort of arbitration between the two different
processors is therefore necessary. The building processor
requests access to the block, locks it and is then able to
enter the block to update the data structure. Once the
update is completed the data structure may be released.
This allows the interpreting processor, to return to read
the complete data structure, thus ensuring a consistent
data structure.
Truth Table
Table 1 : Non Contention Read/Write Control.
INPUTS (1)
OUTPUTS
MODE
CS
R/W
OE
UB
LB
SEM
IO8–IO15
I/O0–I/O7
MODE
H
X
H
Hi–Z
Deselected : Power Down
X
H
Hi–Z
Deselected : Power Down
L
X
L
H
DATAIN
Hi–Z
Write to Upper Byte Only
L
X
H
L
H
Hi–Z
DATAIN
Write to Lower Byte Only
L
X
L
H
DATAIN
Write to Both Bytes
L
H
L
H
DATAOUT
Hi–Z
Read Upper Byte Only
L
H
L
H
L
H
Hi–Z
DATAOUT
Read Lower Byte Only
L
H
L
H
DATAOUT
Read Both Bytes
X
H
X
Hi–Z
Outputs Disabled
H
L
X
L
DATAOUT
Read Data in Sema. Flag
X
H
L
H
L
DATAOUT
Read Data in Sema. Flag
H
X
L
DATAIN
Write DIN0 into Sema. Flag
X
H
L
DATAIN
Write DIN0 into Sema. Flag
L
X
L
X
L
–
Not Allowed
L
X
L
–
Not Allowed
Note :
1. A0L – A12L ≠ A0R – A12R.
Table 2 : Arbitration Options.
OPTIONS
INPUTS
OUTPUTS
OPTIONS
CS
UB
LB
M/S
SEM
BUSY
INT
Busy Logic Master
L
X
L
H
Output
–
yg
L
X
H
Signal
Busy Logic Slave
L
X
L
H
Input
–
yg
L
X
L
H
Signal
–
Interrupt Logic
L
X
L
X
H
–
Output
pg
L
X
H
Signal
Semaphore Logic*
H
X
H
L
H
–
pg
H
X
L
Hi–Z
* Inputs Signals are for Semaphore Flags set and test (Write and Read) operations.
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