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參數(shù)資料
| 型號： | DS1994L-F5 |
| 廠商： | DALLAS SEMICONDUCTOR |
| 元件分類： | Memory IC:Other |
| 英文描述： | SPECIALTY MEMORY CIRCUIT, MRDB2 |
| 封裝： | MICRO CAN |
| 文件頁數(shù)： | 2/23頁 |
| 文件大?。?/td> | 537K |
| 代理商： | DS1994L-F5 |
DS1992/DS1993/DS1994
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MEMORY FUNCTION COMMANDS
The “Memory Function Flow Chart” (Figure 6) describes the protocols necessary for accessing the
memory. An example follows the flowchart. Three address registers are provided as shown in Figure 5.
The first two registers represent a 16-bit target address (TA1, TA2). The third register is the ending
offset/data status byte (E/S).
The target address points to a unique byte location in memory. The first five bits of the target address
(T4:T0) represent the byte offset within a page. This byte offset points to one of 32 possible byte
locations within a given page. For instance, 00000b points to the first byte of a page where as 11111b
would point to the last byte of a page.
The third register (E/S) is a read only register. The first five bits (E4: E0) of this register are called the
ending offset. The ending offset is a byte offset within a page (1 of 32 bytes). Bit 5 (PF) is the partial byte
flag. Bit 6 (OF) is the overflow flag. Bit 7 (AA) is the authorization accepted flag.
ADDRESS REGISTERS Figure 5
7
6
5
4
3
2
1
0
TARGET ADDRESS (TA1)
T7
T6
T5
T4
T3
T2
T1
T0
TARGET ADDRESS (TA2)
T15
T14
T13
T12
T11
T10
T9
T8
ENDING ADDRESS WITH
DATA STATUS (E/S)
(READ ONLY)
AA
OF
PF
E4
E3
E2
E1
E0
Write Scratchpad Command [0Fh]
After issuing the write scratchpad command, the user must first provide the 2-byte target address,
followed by the data to be written to the scratchpad. The data will be written to the scratchpad starting at
the byte offset (T4:T0). The ending offset (E4: E0) will be the byte offset at which the host stops writing
data. The maximum ending offset is 11111b (31d). If the host attempts to write data past this maximum
offset, the overflow flag (OF) will be set and the remaining data will be ignored. If the user writes an
incomplete byte and an overflow has not occurred, the partial byte flag (PF) will be set.
Read Scratchpad Command [AAh]
This command may be used to verify scratchpad data and target address. After issuing the read scratchpad
command, the user may begin reading. The first two bytes will be the target address. The next byte will
be the ending offset/data status byte (E/S) followed by the scratchpad data beginning at the byte offset
(T4: T0). The user may read data until the end of the scratchpad after which the data read will be all logic
1’s.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1994L-F5+ | 功能描述:iButton RoHS:否 存儲類型:SRAM 存儲容量:512 B 組織: 工作電源電壓:3 V to 5.25 V 接口類型:1-Wire 最大工作溫度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封裝 / 箱體:F5 MicroCan 制造商:Maxim Integrated |
| DS1994L-F5-W | 功能描述:iButton RoHS:否 存儲類型:SRAM 存儲容量:512 B 組織: 工作電源電壓:3 V to 5.25 V 接口類型:1-Wire 最大工作溫度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封裝 / 箱體:F5 MicroCan 制造商:Maxim Integrated |
| DS1994-LFS | 制造商: 功能描述: 制造商:undefined 功能描述: |
| DS1995 | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:16-kbit Memory iButton |
| DS1995L-F5 | 功能描述:iButton RoHS:否 存儲類型:SRAM 存儲容量:512 B 組織: 工作電源電壓:3 V to 5.25 V 接口類型:1-Wire 最大工作溫度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封裝 / 箱體:F5 MicroCan 制造商:Maxim Integrated |
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