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參數(shù)資料
| 型號： | SMH4042AGAGM |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Distributed Power Hot-Swap Controller for CompactPCI |
| 中文描述： | 分布式電源熱插拔控制器的CompactPCI |
| 文件頁數(shù)： | 14/28頁 |
| 文件大?。?/td> | 1822K |
| 代理商： | SMH4042AGAGM |
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14
SMH4042A
2070 9.1 5/27/03
SUMMIT MICROELECTRONICS, Inc.
WRITE OPERATIONS
The SMH4042A allows two types of Write operations to its
a 512 x 8 array: byte Write and page Write. A byte Write
operation writes a single byte during the nonvolatile Write
period (t
WR
). The page Write operation allows up to 16
bytes in the same page to be written during t
WR
.
Byte Write
After the slave address is sent (to identify the slave
device, and a Read or Write operation), a second byte is
transmitted which contains the 8 bit address of any one
of the 512 words in the array. Upon receipt of the word
address the SMH4042A responds with an Acknowledge.
After receiving the next byte of data, it again responds with
an Acknowledge. The master then terminates the transfer
by generating a Stop condition, at which time the
SMH4042A begins the internal write cycle. The
SMH4042A inputs are disabled while the internal write
cycle is in progress, and the device will not respond to any
requests from the Master.
Page Write
The SMH4042A is capable of a 16-byte page Write opera-
tion. It is initiated in the same manner as the byte-Write
operation, but, instead of terminating the Write cycle after
the first data word, the Master can transmit up to 15 more
bytes of data. After the receipt of each byte the SMH4042A
will respond with an Acknowledge.
The SMH4042A automatically increments the address for
subsequent data words. After the receipt of each word the
low order address bits are internally incremented by one.
The high order bits of the address byte remain constant.
Should the Master transmit more than 16 bytes, prior to
generating the Stop condition, the address counter will roll
over and the previously written data will be overwritten.
As with the byte-Write operation, all inputs are disabled
during the internal write cycle. Refer to Figure 5 for the
address, Acknowledge and data transfer sequence.
Acknowledge Polling
When the SMH4042A is performing an internal Write
operation it will ignore any new Start conditions. Since the
device will only return an acknowledge after it accepts the
Start, the part can be continuously queried until an
acknowledge is issued, indicating that the internal write
cycle is complete. See Flow Chart 2 for the proper
sequence of operations for polling.
READ OPERATIONS
There are two different read options:
1. Current Address Byte Read
2. Random Address Byte Read
Current Address Read
The SMH4042A contains an internal address counter
which maintains the address of the last word accessed,
incremented by one. If the last address accessed (either
a Read or Write) was to address location n, the next Read
operation would access data from address location n+1
and increment the current address pointer. When the
SMH4042A receives the Slave address field with the R/W
MEMORY OPERATION
Flow Chart 2. Polling
Next
Operation
a Write
ACK
Returned
Issue
Address
Proceed
With
Write
Await
Next
Command
Issue Stop
Issue Slave
Address and
R/W = 0
Issue Stop
Write Cycle
In Progress
Yes
No
Issue Start
2070 Flow02
Yes
No
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SMH4042AGAGN | Distributed Power Hot-Swap Controller for CompactPCI |
| SMH4042AGAHM | Distributed Power Hot-Swap Controller for CompactPCI |
| SMH4042AGAHN | Distributed Power Hot-Swap Controller for CompactPCI |
| SMH4042ASBLN | Distributed Power Hot-Swap Controller for CompactPCI |
| SMH4042ASAGM | Distributed Power Hot-Swap Controller for CompactPCI |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SMH4042AGAGN | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Distributed Power Hot-Swap Controller for CompactPCI |
| SMH4042AGAHM | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Distributed Power Hot-Swap Controller for CompactPCI |
| SMH4042AGAHN | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Distributed Power Hot-Swap Controller for CompactPCI |
| SMH4042AGAKM | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Distributed Power Hot-Swap Controller for CompactPCI |
| SMH4042AGAKN | 制造商:SUMMIT 制造商全稱:SUMMIT 功能描述:Distributed Power Hot-Swap Controller for CompactPCI |
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