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SN74ACT2440 Datenblatt(PDF) 1 Page - Texas Instruments |
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SN74ACT2440 Datenblatt(HTML) 1 Page - Texas Instruments |
1 / 33 page SN74ACT2440 NuBus ™ INTERFACE CONTROLLER SCHS010 – D3158, OCTOBER 1988 – REVISED JANUARY 1991 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 Copyright © 1991, Texas Instruments Incorporated 1 • Designed for NuBus™ Interface Applications • Supports Master, Slave, and Master/Slave Applications • Conforms to ANSI/IEEE Std 1196-1987 • Designed to Operate With SN74BCT2420 NuBus ™ Data/Address Interface Devices • Supports NuBus™ 1987 Block Transfers With the Addition of the SN74ALS2442 • EPIC™ (Enhanced Performance Implanted CMOS) 1- µm Process • Fully TTL-Compatible • Dependable Texas Instruments Quality and Reliability description The SN74ACT2440 NuBus ™ Controller handles NuBus ™ signaling protocol in compliance with ANSI/IEEE Std 1196-1987. The device allows a simple connection to the NuBus ™; 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 ™ Block Slave Transfers Using Texas Instruments SN74ACT2440, SN74BCT2420, and SN74ALS2442. Figure 1 shows a typical NuBus ™ interface using the ’ACT2440. Data and address buffering is handled via two SN74BCT2420s. The SN74BCT2420s are BiCMOS buffers designed specifically for supporting NuBus ™ 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 ™ card-slot signals, and NuBus™ status signals. Byte decode determines which type of NuBus ™ cycle is being performed. Data/address interface control provides the buffering signals required to multiplex and de-multiplex the NuBus ™ data/address lines. The master/slave inputs control the master- and slave-state machines. The NuBus ™ card-slot signals interface with the NuBus™. The NuBus ™ status signals indicate the status of the master/slave-state machines and provide buffered NuBus ™ signals. Refer to Table 1 for additional details. The SN74ACT2440 is characterized for operation from 0 °C to 70°C. 67 68 28 29 A1 A0 VCC SIACK SGNTA LOCTM1 LOCTM0 NMREQ GND MHOLD LACK MLREQ MRDY NREQ MDONE NLOCK NMSTR 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 30 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 RESET ARB0 GND ARB1 GND ARB2 GND ARB3 GND VCC START ACK GND RQST GND NMRQ CLK 31 32 33 34 FN PACKAGE (TOP VIEW) 87 6 5 4 93 1 2 35 36 37 38 39 66 65 27 64 63 6261 40 41 42 43 PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. NuBus is a trademark of Texas Instruments Incorporated. EPIC is a trademark of Texas Instruments Incorporated. |
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