DS2155 datasheet(24/238 Pages) DALLAS

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DS2155

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Signal Name:

RCLKI

Signal Description:

Receive Clock Input

Signal Type:

Input

Clock used to clock data through the receive-side framer. This pin is normally connected to RCLKO. Can be

internally connected to RCLKO by connecting the LIUC pin high.

4.3 Parallel Control Port Pins

Signal Name:

INT

Signal Description:

Interrupt

Signal Type:

Output

Flags host controller during conditions and events defined in the status registers. Active-low, open-drain output.

Signal Name:

TSTRST

Signal Description:

Tri-State Control and Device Reset

Signal Type:

Input

A dual function pin. A 0-to-1 transition issues a hardware reset to the DS2155 register set. A reset clears all

configuration registers. Configuration register contents are set to 0. Leaving TSTRST high tri-states all output and

I/O pins (including the parallel control port). Set low for normal operation. Useful in board-level testing.

Signal Name:

MUX

Signal Description:

Bus Operation

Signal Type:

Input

Set low to select nonmultiplexed bus operation. Set high to select multiplexed bus operation.

Signal Name:

AD0 to AD7

Signal Description:

Data Bus [D0 to D7] or Address/Data Bus

Signal Type:

Input/Output

In nonmultiplexed bus operation (MUX = 0), these serve as the data bus. In multiplexed bus operation (MUX = 1),

these pins serve as an 8-bit multiplexed address/data bus.

Signal Name:

A0 to A6

Signal Description:

Address Bus

Signal Type:

Input

In nonmultiplexed bus operation (MUX = 0), these serve as the address bus. In multiplexed bus operation

(MUX = 1), these pins are not used and should be connected low.

Signal Name:

BTS

Signal Description:

Bus Type Select

Signal Type:

Input

Strap high to select Motorola bus timing; strap low to select Intel bus timing. This pin controls the function of the

RD (DS), ALE (AS), and WR (R/W) pins.

If BTS = 1, then these pins assume the function listed in parentheses ().

Signal Name:

RD (DS)

Signal Description:

Read Input, Data Strobe

Signal Type:

Input

In Intel mode, RD determines when data is read from the device. In Motorola mode, DS is used to write to the

device. See Bus Timing Diagrams.

DS2155 Datasheet(PDF) 24 Page - Dallas Semiconductor

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