 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
CT1611-FP Datasheet(PDF) 1 Page - Aeroflex Circuit Technology |
|
||||||||||||||||||||||||||||||
CT1611-FP Datasheet(HTML) 1 Page - Aeroflex Circuit Technology |
|
|
1 / 24 page  SCDCT1611 Rev A GENERAL The CT1611 provides a complete Bus Controller and Remote Terminal interface between the MIL-STD-1553B chip set (CT1561, CT1602, CT1610, etc.) and most microprocessor-based systems (F9450A, 68000, 8086, VME bus, Multibus, etc.). The unit is constructed totally with CMOS technology and includes a custom CMOS chip, two HC CMOS FIFO's and HCT CMOS buffers. Thus the interface has extremly low power requirements. The CT1611 interface permits the use of all 15 mode codes and all types of data transfers as specified in MIL-STD-1553B in both Bus Controller and Remote Terminal operating modes. A Remote Terminal is capable of switching to a Bus Controller when requested via the Dynamic Bus Control mode code. DATA TRANSFERS Data transfers in both Bus Controller and Remote Terminal operation are performed via a DMA burst. This powerful feature insures that the host microprocessor system will never be held up more than 16.5 usec when transferring 32 data words into or out of the interface. It also insures that only good and complete messages will be transferred to the host's memory. Operation of the DMA is as follows: When data is received from the 1553 cable via the chip set, it is loaded into an internal FIFO at the 20 µsec/word 1553 rate. Once the complete message has been received and has passed all validity tests, the CT1611 issues the signal DMA REQ to the subsystem. (This signal corresponds to a HOLD request in many systems.) The host microprocessor then acknowledges and grants this request by issuing the signal DMA ACK. The CT1611 then becomes the bus master of the subsystem and transfers all the data on a memory-mapped basis. When the transfer is complete, the CT1611 removes its DMA REQ and returns control of the microprocessor bus to the microprocessor. When data is to be transmitted on the 1553 cable, a similar DMA takes place. Data is preloaded into the FIFO via a single DMA burst and then transmitted. As a failsafe, an internal timeout is provided to insure that the CT1611 can never control the microprocessor bus longer than 80 µsec. In addition, a hard-wired Master Reset input signal is provided that will place all output signals in a tri-state condition. Therefore, in the unlikely condition of a failure in the CT1611, the host microprocessor system can never be brought down or placed in a non-recoverable state. A built-in test function has been included to exercise the DMA operation and verify the message data path. This function is initiated by an I/O command from the subsystem. I/O CONTROL The CT1611 can be addressed, written to, read from, and programmed much like any peripheral device located on a microprocessor bus. The address lines and a device select input signal allow the subsystem to read or write to the CT1611 as if it were memory. In view of the fact that microprocessors are becoming very fast, two types of handshake signals were incorporated into the CT1611, either of which may be used to permit asynchronous read and write operations. Handshaking directly with the 9450A, 8085, 8086 and the 6802 is the active high Ready signal. Handshaking directly with the 68000 or VME and Multibus busses is the active low Acknowledge signal. INTERFACING To accomodate both 8 and 16 bit microprocessor data busses, the CT1611 data path is pin programmable for either operation. When operating in 8 bit mode, data is DMA'd in 8 bit bytes and therefore requires twice the time to be transferred. Bus control signals are pin programmable for either individual read and write strobes or a common read/write signal and data strobe. Individual read and write strobes are used with the Intel 8085, 8086 and Multibus. A common read/write signal and data strobe are used with the 9450A, 6802, 68000 and VME bus. Two separate pins are provided for input and output data strobes. These signals may be connected or kept separate to insure that 1553 data can never be written into a protected area of memory. RTU OPERATION The CT1611 is powered-up and reset as a Remote Terminal. In addition, in Bus Controller mode, it can be changed into a Remote Terminal via an I/O command. In Remote Terminal mode, the CT1611 uses dedicated registers for the received command word, the sync data word, and the vector word. The command word register contains a second tier so that receive command words are double buffered. This feature maximizes the allowable I/O access time. Four interrupts are provided to alert the subsystem that a valid message has been received or transmitted or that a mode command has CT1611 Microprocessor Interface Standard Products DMA Controller with Buffer Memory, September 16, 2003 www.aeroflex.com MIL-STD-1750A Compatible FEATURES Full Bus Control and RTU Operation Low Software Overhead Complete BI-Directional Message Buffer Memory-Mapped DMA Message Transfers Simple Programmable Polling Operation in Bus Controller Mode Pin Programmable for both 8 and 16 Bit Microprocessors Monolithic construction using linear ASICs Processed and screened to MIL-STD-883 specs Aeroflex is a Class H & K MIL-PRF-38534 Manufacturer MIL-PRF-38534 Compliant Devices Available |
Similar Part No. - CT1611-FP |
|
Similar Description - CT1611-FP |
|
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.COM |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
