SN74ACT2440INTERFACE CONTROLLER

SCHS010 - D3158, OCTOBER 1988 - REVISED JANUARY 1991

features

Designed for NuBus^TM Interface Applications
Supports Master, Slave, and Master/Slave Applications
Conforms to ANSI/IEEE Std 1196-1987
Designed to Operate With SN74BCT2420 NuBus^TM Data/Address Interface Devices
Supports NuBus^TM 1987 Block Transfers With the Addition of the SN74ALS2442
EPIC^TM (Enhanced Performance Implanted CMOS) 1-um Process
Fully TTL-Compatible
Dependable Texas Instruments Quality and Reliability
NuBus is a trademark of Texas Instruments Incorporated. EPIC is a trademark of Texas Instruments Incorporated.

description

The SN74ACT2440 NuBus^TM Controller handles NuBus^TM signaling protocol in compliance with ANSI/IEEE Std 1196-1987. The device allows a simple connection to the NuBus^TM; typical configurations include master-only, slave-only,

and master/slave. Additionally, it provides extra status and control lines to facilitate more sophisticated approaches. With the addition of the SN74ALS2442, slave block transfers can be supported by this device. For additional details on block transfers, consult the SN74ALS2442 data sheet and the application note titled Supporting NuBus^TM Block Slave Transfers Using Texas Instruments SN74ACT2440, SN74BCT2420, and SN74ALS2442.

Figure 1 shows a typical NuBus^TM interface using the 'ACT2440. Data and address buffering is handled via two SN74BCT2420s. The SN74BCT2420s are BiCMOS buffers designed specifically for supporting NuBus^TM interfacing. The 'ACT2440 provides the buffer control signals needed to directly drive the SN74BCT2420s; however, in simpler applications, standard SSI and MSI buffers may be used in place of the 'BCT2420s.

The 'ACT2440 is comprised of five major signal groups: byte decode signals, data/address interface-control signals, master/slave input signals, NuBus^TM card-slot signals, and NuBus^TM status signals. Byte decode determines which type of NuBus^TM cycle is being performed. Data/address interface control provides the buffering signals required to multiplex and de-multiplex the NuBus^TM data/address lines. The master/slave inputs control the master- and slave-state machines. The NuBus^TM card-slot signals interface with the NuBus^TM. The NuBus^TM status signals indicate the status of the master/slave-state machines and provide buffered NuBus^TM signals. Refer to Table 1 for additional details.

The SN74ACT2440 is characterized for operation from 0°C to 70°C.

Title: NUBUS INTERFACE CONTROLLER
Product Family: BACKPLANE LOGIC (GTL, FB/FBPLUS, BTL, ETL)
Device Functionality: BUS INTERFACE

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