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DP8496 bảng dữ liệu(PDF) 37 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
tên linh kiện DP8496
Giải thích chi tiết về linh kiện  SCSI-2 Disk Data Controller
PDF  92 Pages
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nhà sản xuất  NSC [National Semiconductor (TI)]
Trang chủ  http://www.national.com
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DP8496 bảng dữ liệu(HTML) 37 Page - National Semiconductor (TI)

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40 Functional Description (Continued)
TLF11212 – 15
FIGURE 48 RGATE Operation during Search for Synch
RGATE Timing for Soft Sectors
Ideally RGATE should transition from deasserted to assert-
ed only while the drive’s head is positioned over a preamble
field Proper programming of the gap lengths in the Format
registers strive for this condition
However for soft sectored drives it is impossible to avoid
asserting RGATE over non-preamble fields as shown in
Fig-
ure 49
For soft sectored drives the DP84967 employs a RGATE
algorithm to allow an external PLL to re-lock to the proper
frequency while searching for a preamble and address
mark This algorithm is shown in
Figure 48 While reading a
preamble (or what the DP84967 thinks is a preamble) the
first non-zero bit clears a bit counter If the data read for this
bit and the next 7 bits do not match the proper Synch regis-
ter RGATE is deasserted If a Synch match is made the
read operation continues to its conclusion
If RGATE is deasserted it will remain deasserted for either
two or six byte times This time is determined by the PLL
(PLL Recovery Time) bit in the Disk Control register
37



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