GD82559C S L3DF Intel, GD82559C S L3DF Datasheet - Page 58

• Manufacturer Part Number: GD82559C S L3DF
• Manufacturer: Intel

Specifications of GD82559C S L3DF

• Lead Free Status / Rohs Status: Not Compliant

82559 — Networking Silicon
6.3.2
50
Figure 18. Support Circuitry Example
This enables both the modem and boot ROM. This allows the Boot Enable bit in the Expansion
BAR to select which external device (modem or Flash) is active on the local bus through the use of
the CFCS# pin. After initialization, the 82559 C-step enables the Flash on the local bus (in other
words, the Boot Enable bit in the BAR equals 1b) and the modem is disabled. Following the
execution of the boot code from the Flash device, the enable bit is cleared, and the modem is
enabled. The clearing of the Boot Enable bit causes the CFCS# pin to be de-asserted, enabling the
modem, Function 1 (Modem) Configuration space, to be available regardless of the state of the
Boot Enable bit or CFCS#.
Support Circuitry
An example of support circuitry is shown in
enabled; CFCS# is high, the Flash device is enabled.
2. Clear the BD bit in the EEPROM.
FLCS#
CFCS#
(Modem_Mode#)
Figure
18. When CFCS# is low, the modem is
MODEM_CS#
FLASH_CS#
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