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PC87413 데이터시트(PDF) 94 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
부품명 PC87413
상세설명  LPC ServerI/O for Servers and Workstations
PDF  257 Pages
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제조업체  NSC [National Semiconductor (TI)]
홈페이지  http://www.national.com
Logo NSC - National Semiconductor (TI)

PC87413 데이터시트(HTML) 94 Page - National Semiconductor (TI)

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5.0 X-Bus Extension (Continued)
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94
Revision1.2
Memory Transactions. The 32-bit address received from the LPC bus is used to decode the different memory zones de-
scribed in Section 3.15.3 on page 76. The address is then translated to the X-Bus address, using the following rules:
q
User-Defined Memory Zones (MEM 0 and MEM 1) and 386 Mode-Compatible BIOS Range: The 28 least significant
address lines of the LPC address are used as the X-Bus input address. Figure 13 illustrates the mapping for this
zone.
q
Legacy and Extended Legacy BIOS Range: The 17 least significant address lines (A16-0) of the LPC address are
routed as the 17 least significant address signals of the X-Bus (XA16-0). The upper 11 X-Bus address lines are driv-
en to ‘1’. This shifts the addresses to the top of the X-Bus memory space (see Figure 14).
Figure 13. LPC-to-X-Bus Address Translation: 386 Mode-Compatible BIOS Range
Figure 14. LPC-to-X-Bus Address Translation: Legacy and Extended Legacy BIOS Ranges
LPC Bus Address
FFFF FFFFh
xFFF FFFFh
X-Bus Address
FFFC 0000h
xFFC 0000h
0000 0000h
LPC Bus Address
FFFF FFFFh
xFFF FFFFh
X-Bus Address
000F FFFFh
xFFE 0000h
0000 0000h
000F 0000h
000E FFFFh
000E 0000h
Legacy BIOS
Extended
Legacy BIOS



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