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PC87413 Fiches technique(PDF) 60 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No de pièce PC87413
Description  LPC ServerI/O for Servers and Workstations
PDF  257 Pages
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Fabricant  NSC [National Semiconductor (TI)]
Site Internet  http://www.national.com
Logo NSC - National Semiconductor (TI)

PC87413 Fiches technique(HTML) 60 Page - National Semiconductor (TI)

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3.0 Device Architecture and Configuration (Continued)
www.national.com
60
Revision1.2
3.8.4
Drive ID Register
This register is reset by hardware to 00h. This register controls bits 5 and 4 of the TDR register in Enhanced mode.
Power Well:VDD
Location:Index F1h
Type:
R/W
Usage Hints: Some BIOS implementations support automatic media sense FDDs, in which case bit 5 of the TDR register
in the Enhanced mode is interpreted as valid media sense when it is cleared to 0. If drive 0 and/or drive 1 do not support
automatic media sense, bits 1 and/or 3 of the Drive ID register must be set to 1 (to indicate non-valid media sense). When
Drive 0 or Drive 1 is selected, the Drive ID bit is reflected on bit 5 of the TDR register in Enhanced mode.
Bit
76543210
Name
Reserved
Drive 1 ID
Drive 0 ID
Reset
00000000
Bit
Description
7-4
Reserved.
3-2
Drive 1 ID. When drive 1 is accessed, these bits are reflected on bits 5-4 of the TDR register, respectively.
1-0
Drive 0 ID. When drive 0 is accessed, these bits are reflected on bits 5-4 of the TDR register, respectively.



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