DS3134 datasheet(26/203 Pages) DALLAS

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DS3134

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Signal Name:

LRDY*

Signal Description:

Local Bus PCI Bridge Ready [PCI Bridge Mode Only]

Signal Type:

Input

This active low signal is sampled on the rising edge of LCLK to determine when a bus transaction is

complete. This signal is only examined when a bus transaction is taking place. This signal is ignored

when the Local Bus is in the Configuration Mode (LMS = 1) and should be tied high.

Signal Name:

LHLDA (LBG*)

Signal Description:

Local Bus Hold Acknowledge (Local Bus Grant) [PCI Bridge Mode Only]

Signal Type:

Input

This input signal is sampled on the rising edge of LCLK to determine when the device has been granted

access to the bus. In Intel Mode (LIM = 0) this is an active high signal and in Motorola Mode (LIM = 1)

this is an active low signal. This signal is ignored and should be tied high when the Local Bus is in the

Configuration Mode (LMS = 1). Also, in the PCI Bridge Mode (LMS = 0), this signal should be tied

deasserted when the Local Bus Arbitration is disabled via the Local Bus Bridge Mode Control Register.

Signal Name:

LHOLD (LBR*)

Signal Description:

Local Bus Hold (Local Bus Request) [PCI Bridge Mode Only]

Signal Type:

Output

This active low signal will be asserted when the Local Bus is attempting to take control of the bus. It will

be deasserted in the Intel Mode (LIM = 0) when the bus access is complete. It will be deasserted in the

Motorola Mode (LIM = 1) when the Local Bus Hold Acknowledge/Grant signal (LHLDA/LBG*) has

been detected. This signal is tri-stated when the Local Bus is in the Configuration Mode (LMS = 1) and

in the PCI Bridge Mode (LMS = 0) when the Local Bus Arbitration is disabled via the Local Bus Bridge

Mode Control Register.

Signal Name:

LBGACK*

Signal Description:

Local Bus Grant Acknowledge [PCI Bridge Mode Only]

Signal Type:

Output (tri-state capable)

This active low signal is asserted when the Local Bus Hold Acknowledge/Bus Grant signal

(LHLDA/LBG*) has been detected and it continues it's assertion for a programmable (32 to 1048576)

number of LCLKs based upon the Local Bus Arbitration Timer setting in the Local Bus Bridge Mode

Control Register (LBBMC) register. This signal is tri-stated when the Local Bus is in the Configuration

Mode (LMS = 1).

Signal Name:

LBHE*

Signal Description:

Local Bus Byte High Enable [PCI Bridge Mode Only]

Signal Type:

Output (tri-state capable)

This active low output signal is asserted when all 16-bits of the data bus (LD[15:0]) are active. It will

remain high if only the lower 8-bits (LD[7:0)] is active. If bus arbitration is enabled via the Local Bus

Arbitration (LARBE) control bit in the Local Bus Bridge Mode Control Register (LBBMC), then this

signal will be tri-stated when the Local Bus is not currently involved in a bus transaction and driven when

a bus transaction is active. When bus arbitration is disabled, this signal is always driven. This signal will

remain in tri-state when the Local Bus is not currently involved in a bus transaction and when the Local

Bus is in the Configuration Mode (LMS = 1).

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