DS2196 datasheet(16/157 Pages) DALLAS

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DS2196

16 of 157

Parallel Control Port Pins

Signal Name:

INT*

Signal Description:

Interrupt

Signal Type:

Output

Flags host controller during conditions and change of states as defined in the Status Registers. Active low, open

drain output.

Signal Name:

MUX

Signal Description:

Bus Operation

Signal Type:

Input

Set low to select non-multiplexed bus operation. Set high to select multiplexed bus operation.

Signal Name:

D0 to D7 / AD0 to AD7

Signal Description:

Data Bus or Address/Data Bus

Signal Type:

Input / Output

In non-multiplexed bus operation (MUX = 0), serves as the data bus. In multiplexed bus operation (MUX = 1),

serves as a 8–bit multiplexed address / data bus.

Signal Name:

A0 to A6

Signal Description:

Address Bus

Signal Type:

Input

In non-multiplexed bus operation (MUX = 0), serves as the address bus. In multiplexed bus operation (MUX = 1),

these pins are not used and should be tied 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 parenthesis

().

Signal Name:

RD* (DS*)

Signal Description:

Read Input (Data Strobe)

Signal Type:

Input

RD* is an active low signal. DS* polarity is determined by the MUX pin setting. Refer to section 21 for details.

Signal Name:

CS*

Signal Description:

Chip Select

Signal Type:

Input

Must be low to read or write to the device. CS* is an active low signal.

Signal Name:

ALE(AS) / A7

Signal Description:

A7 or Address Latch Enable (Address Strobe)

Signal Type:

Input

In non-multiplexed bus operation (MUX = 0), serves as the upper address bit. In multiplexed bus operation (MUX

= 1), serves to demultiplex the bus on a positive–going edge.

Signal Name:

WR*( R/W*)

Signal Description:

Write Input (Read/Write)

Signal Type:

Input

WR* is an active low signal.

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