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參數(shù)資料
| 型號： | DS1963 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 4K-Bit Monetary iButton(4K位貨幣按鈕) |
| 中文描述： | 4K的位貨幣iButton的（4K的位貨幣按鈕） |
| 文件頁數(shù)： | 19/22頁 |
| 文件大?。?/td> | 147K |
| 代理商： | DS1963 |
DS1962/DS1963
020698 19/22
READ/WRITE TIMING DIAGRAM
Figure 11 cont’d
Read–data Time Slot
V
V
PULPULLUP
IH MIN
V
IL MAX
0V
t
SLOT
t
REC
t
RDV
t
LOWR
Regular Speed
60
μ
s < t
SLOT
< 120
μ
s
1
μ
s < t
LOWR
< 15
μ
s
0 < t
RELEASE
< 45
μ
s
1
μ
s < t
REC
<
t
RDV
= 15
μ
s
t
SU
< 1
μ
s
t
RELEASE
MASTER SAMPLING
WINDOW
RESISTOR
MASTER
DS196X
Overdrive Speed
6
μ
s < t
SLOT
< 16
μ
s
1
μ
s < t
LOWR
< 2
μ
s
0 < t
RELEASE
< 4
μ
s
1
μ
s < t
REC
<
t
RDV
= 2
μ
s
t
SU
< 1
μ
s
t
SU
CRC GENERATION
With the DS196X there are two different types of CRCs
(Cyclic Redundancy Checks). One CRC is an 8–bit
type and is stored in the most significant byte of the
64–bit ROM. The bus master can compute a CRC value
from the first 56 bits of the 64–bit ROM and compare it to
the value stored within the DS196X to determine if the
ROM data has been received error–free by the bus
master. The equivalent polynomial function of this CRC
is: X
8
+ X
5
+ X
4
+ 1. This 8–bit CRC is received in the
true (non–inverted) form when reading the ROM of the
DS196X. It is computed at the factory and lasered into
the ROM.
The other CRC is a 16–bit type, generated according to
the standardized CRC16–polynomial function x
16
+ x
15
+ x
2
+ 1. This CRC is used for error detection when
reading Data Memory using the Read Memory +
Counter command and for fast verification of a data
transfer when writing to the scratchpad. It is the same
type of CRC as is used with NV RAM based iButtons for
error detection within the iButton Extended File Struc-
ture. In contrast to the 8–bit CRC, the 16–bit CRC is
always returned or sent in the complemented (inverted)
form. A CRC–generator inside the DS196X chip (Figure
12) will calculate a new 16–bit CRC as shown in the
command flow chart of Figure 7. The bus master
compares the CRC value read from the device to the
one it calculates from the data and decides whether to
continue with an operation or to re–read the portion of
the data with the CRC error.
With the initial pass through the Read Memory +
Counter flow chart the 16–bit CRC value is the result of
shifting the command byte into the cleared CRC gener-
ator, followed by the two address bytes, the data bytes,
value of the page write cycle counter and tamper–detect
bits. Subsequent passes through the Read Memory +
Counter flow chart will generate a 16–bit CRC that is the
result of clearing the CRC generator and then shifting in
the data bytes, the value of the page write cycle counter
and the tamper–detect bits.
With the Write Scratchpad command the CRC is gener-
ated by first clearing the CRC generator and then shift-
ing in the command code, the Target Addresses TA1
and TA2 and all the data bytes. The DS196X will trans-
mit this CRC only if the data bytes written to the scratch-
pad include scratchpad ending offset 11111b. The data
may start at any location within the scratchpad.
For more details on generating CRC values including
example implementations in both hardware and soft-
ware, see the “Book of DS19xx iButton Standards”.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS1981U | UniqueWare iButton(唯一貨品按鈕) |
| DS1982U | UniqueWare iButton(UniqueWare iButton標(biāo)準(zhǔn)的EPROM) |
| DS1982 | UniqueWare iButton(UniqueWare iButton標(biāo)準(zhǔn)的EPROM) |
| DS1985 | UniqueWare iButton(唯一貨品按鈕) |
| DS1986U | UniqueWare iButton(唯一貨品按鈕) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1963L | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4 kbit Monetary iButton |
| DS1963L-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 |
| DS1963L-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 |
| DS1963L-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 |
| DS1963R-F5+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
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