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參數(shù)資料
| 型號： | L6000 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | SINGLE CHIP READ & WRITE CHANNEL |
| 中文描述： | 單芯片讀 |
| 文件頁數(shù)： | 21/24頁 |
| 文件大?。?/td> | 279K |
| 代理商： | L6000 |
matically restart the Address Mark search.
2.Preamble is recognized upon the presence of
three cycles of a 3Tpattern.
3.Recognition of preamble switches phase de-
tector input from the Fout divide by 2 refer-
ence clock to delayed readback data (DRD)
4.The VCO is zero phase error restarted to the
3 x 3T readback pulse seen after switching of
the phasedetector input.
5.Depending on the state of the GS bit in the
Control B register:
If GSis set:
a)The IC will count 8 more data bits(3T peri-
ods) and then will decrease the charge
pump current to 1/3 its lock up value. After
8 more data bits, the data Synchronizer
starts to decode NRZ. The switchover for
READ REF CLOCK from Fout divided by 3
to VCO divided by 3 is made, without
glitches.
If GSis reset:
b) The IC will count 16 more data bits (3T
periods) and the charge pump current is
NOT changed. All operations as in GS set
then occur. Decoding specifically starts
later by 8 bitsif GS is reset.
6.RRC clock is output from the pin READ REF
CLOCK and decoded data is output from the
pin READ NRZ OUTPUT until READ GATE
deasserts.
Hard Sector- ReadBack
In Hard Sector, the SOFT bit in Control B register
has been reset. The lock up sequenceprocedees
as follows:
1.An Address Mark is not searched for and
ADDRMARK DET remains inactive.
2.Preamble is recognized upon the presence of
three cycles of a 3Tpatern.
3.Recognition of preamble switches phase de-
tector input from the Fout divide by 2 refer-
ence clock to delayed readback data (DRD).
4.The VCO is zero phase error restarted to the
first readback pulse seen after switching of
the phasedetector input.
5.The rest of the Read mode sequence is iden-
tical to the Soft Sector submode.
Window Shift Control
Window shift magnitude is set by the value in the
Window Shift (WS) register. The register bits are
definedas follows:
Bit
0
1
2
3
4
5
6
7
Symbol
WSO
WS1
WS2
WS3
WSD
WSE
TDACO
TDAC1
Description
Window Shift LSB
Window Shift
Window Shift
Window Shift MSB
Window Shift Direction
Enable Window Shift
Control Bit for DAC Testing
Control Bit for DAC Testing
WSD - Window Shiftdirection control
0
≥
Early window (+TS)
1
≥
Latewindow (-TS)
Window Shift magnitude control bits:
WS3
WS2
WS1
WS0
Shift Magnitude (% of
the decode window)
No shift
2% Minimum shift
4%
6%
8%
10%
12%
14%
16%
18%
20%
22%
24%
26%
28%
30% Maximum shift
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
for example the shift magnitude corresponding to
2% at 10 Mbit/s data rate is 0.667ns. This is 2%
of TVCO since the decode window is 2*TVCO. Its
toleranceis
±
25%. WSE, WSD, WS3, WS2, WS1,
and WS0 are programmed through the serial port
during the idleor write mode.
Write Mode
Write mode takes WRT DATA NRZ IN and
WRITE CLOCK as input, which this mode then
encodes to (1,7) RLL format pulse stream. Again,
there is a SOFT and HARD sector mode for
Writes. WRITE GATE must be asserted no less
than 1 RRC clock period AFTER READ GATE
has been dessearted. This is to allow for clock
deglitching. There is a register which becomes
important only during Write Mode: the Write Pre-
compensation register (R0D). If the WPE bit is
set, the data being written to the disk will be pre-
compensatedby the magnitudespecified, and ac-
cording to the algorithm in the followingTable.
Soft Sector
The write operationsequenceis:
1.WRITE GATE input is asserted and WRT
DATA NRZ IN should be a pattern of 80H or
FFH followed by 8 bytes of 0. This is to allow
L6000
21/24
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| L60000 | 制造商:LAUREL ELECTRONICS 功能描述:Laureate 1/8 DIN serial input meter / remote display, universal 85-264 Vac power |
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| L60001FR | 制造商:LAUREL ELECTRONICS 功能描述:Laureate 1/8 DIN multi-function counter / timer, universal 85-264 Vac power, no relays, no analog output, RS232 communications, dual pulse inputs for frequency, rate, rotal, or timing. ;RoHS Compliant: Yes |
| L60002 | 制造商:Honeywell Sensing and Control 功能描述: 制造商:SKAN-A-MATIC 功能描述: 制造商:LAUREL ELECTRONICS 功能描述:Laureate 1/8 DIN serial input meter / remote display, universal 85-264 Vac power |
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