DS3134 datasheet(169/203 Pages) DALLAS

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DS3134

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10.2 LOCAL BUS BRIDGE MODE CONTROL REGISTER DESCRIPTION

LBBMC

0040h

Note: This register can only be accessed via the PCI Bus and hence only in the PCI Bridge Mode. In the

Configuration Mode, this register cannot be accessed. It will be set to all zeros upon a hardware reset

issued via the PRST* pin. It will not be affected by a software reset issued via the RST control bit in the

Master Reset and ID (MRID) register.

5432

n/a

LBW

LRDY3

LRDY2

LRDY1

LRDY0

LARBE

LCLKE

n/a

LAT3

LAT2

LAT1

LAT0

Note: Bits that are underlined are read only, all other bits are read-write; default value for all bits is 0.

Bit 0 / Local Bus Clock Enable (LCLKE).

0 = tri-state the LCLK output signal pin

1 = allow LCLK to appear at the pin

Bit 1 / Local Bus Arbitration Enable (LARBE). When enabled, the LHOLD(LBR*), LBGACK*, and

LHLDA(LBG*) signal pins are active and the proper arbitration handshake sequence must occur for a

proper bus transaction. When disabled, the LHOLD(LBR*), LBGACK* and LHLDA(LBG*) signal pins

are deactivated and bus arbitration on the Local Bus is not invoked. In addition, the Arbitration Timer is

enabled (see the description of the LAT0 to LAT3 bits) when LARBE is set to a one.

0 = Local Bus Arbitration is disabled

1 = Local Bus Arbitration is enabled

Bit 2 / Local Bus Ready Control Bit 0 (LRDY0). lsb

Bit 3 / Local Bus Ready Control Bit 1 (LRDY1).

Bit 4 / Local Bus Ready Control Bit 2 (LRDY2).

Bit 5 / Local Bus Ready Control Bit 3 (LRDY3). msb

These control bits determine the duration of the Local Bus transaction in the PCI Bridge Mode. The bus

transaction can either be control via the external LRDY* input signal or via a predetermined period of 1

to 11 LCLK periods.

0000 = use the LRDY* signal input pin to control the bus transaction

0001 = bus transaction is defined as 1 LCLK period

0010 = bus transaction is defined as 2 LCLK periods

0011 = bus transaction is defined as 3 LCLK periods

0100 = bus transaction is defined as 4 LCLK periods

0101 = bus transaction is defined as 5 LCLK periods

0110 = bus transaction is defined as 6 LCLK periods

0111 = bus transaction is defined as 7 LCLK periods

1000 = bus transaction is defined as 8 LCLK periods

1001 = bus transaction is defined as 9 LCLK periods

1010 = bus transaction is defined as 10 LCLK periods

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