82551QM datasheet(18/120 Pages) INTEL

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82551QM — Networking Silicon

Datasheet

4.4

System Management Bus (SMB) Interface Signals

FLCS#

OUT

Flash Chip Select. The Flash Chip Select pin provides an active low

Flash or modem chip select signal. This signal in combination with the

Modem Chip Select (MDMCS#) signal determines which device, Flash

or modem, is being used. This pin should be left floating if Flash and

modem functionality are not used.

FLOE#

OUT

Flash Output Enable. This pin provides an active low output enable

control (read) to the Flash memory. If the modem is enabled, this is an

active low output enable (read) of the modem. This pin should be left

floating if Flash and modem functionality are not used.

FLWE#

OUT

Flash Write Enable. This pin provides an active low write enable

control to the Flash memory. If the modem is enabled, this is an active

low write enable to the modem. This pin should be left floating if Flash

and modem functionality are not used.

MDMCS#

OUT

Modem Chip Select. This pin provides an active low modem chip

select. When it is set to 0b, the Flash port is used as a modem port;

when 1b, a Flash port. This pin should be left floating if Flash and

modem are not used.

Table 7.

System Management Bus (SMB) Interface Signals

Symbol

Type

Name and Function

SMBDATA

Alert Bus Data. This signal is stable when the Alert Bus Clock signal is high.

This open drain signal should be pulled high to VCC in all cases.

SMBCLK

Alert Bus Clock. This pin is used for the Alert Bus Clock signal. One clock

pulse is generated for each data bit transferred. It is an open drain signal and

should be pulled high to VCC in all cases.

SMB_ALERT#/

LAN_PWR_GOOD

Bus Alert/Main Power Good. This is a multiplexed pin used as the Bus

Alert pin and Main Power Good pin. As the Bus Alert pin, it is used as an

interrupt signal for a slave device on the Alert Bus. As the Main Power Good

pin it indicates that the main power supply is stable. This pin must be pulled

high to VCC if it is not connected.

Table 6.

Local Memory Interface Signals

Symbol

Type

Name and Function

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