DS3134 datasheet(24/203 Pages) DALLAS

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DS3134

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2.3 LOCAL BUS SIGNAL DESCRIPTION

Signal Name:

LMS

Signal Description:

Local Bus Mode Select

Signal Type:

Input

This signal should be tied low when the device is to be operated either with no Local Bus access or if the

Local Bus will be used to act as a bridge from the PCI bus. This signal should be tied high if the Local

Bus is to be used by an external host to configure the device.

0 = Local Bus is in the PCI Bridge Mode (master)

1 = Local Bus is in the Configuration Mode (slave)

Signal Name:

LIM

Signal Description:

Local Bus Intel/Motorola Bus Select

Signal Type:

Input

The signal determines whether the Local Bus will operate in the Intel Mode (LIM = 0) or the Motorola

Mode (LIM = 1). The signal names in parenthesis are operational when the device is in the Motorola

Mode.

0 = Local Bus is in the Intel Mode

1 = Local Bus is in the Motorola Mode

Signal Name:

LD0 to LD15

Signal Description:

Local Bus Non-Multiplexed Data Bus

Signal Type:

Input / Output (tri-state capable)

In PCI Bridge Mode (LMS = 0), data from/to the PCI bus can be transferred to/from these signals. When

writing data to the Local Bus, these signals will be outputs and updated on the rising edge of LCLK.

When reading data from the Local Bus, these signals will be inputs, which will be sampled on the rising

edge of LCLK. Depending on the assertion of the PCI Byte Enables (PCBE0 to PCBE3) and the Local

Bus Width (LBW) control bit in the Local Bus Bridge Mode Control Register (LBBMC), this data bus

will utilize all 16-bits (LD[15:0]) or just the lower 8-bits (LD[7:0]) or the upper 8-bits (LD[15:8]). If the

upper LD bits (LD[15:8]) are used, then the Local Bus High Enable signal (LBHE*) will be asserted

during the bus transaction. If the Local Bus is not currently involved in a bus transaction, then all 16

signals will be tri-stated. In the Configuration Mode (LMS = 1), the external host will configure the

device and obtain real time status information about the device via these signals. When reading data from

the Local Bus, these signals will be outputs that are updated on the rising edge of LCLK. When writing

data to the Local Bus, these signals will become inputs which will be sampled on the rising edge of

LCLK. In the Configuration Mode, only the 16-bit bus width is allowed (i.e. byte addressing is not

available).

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