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CT1995-20 Datasheet(PDF) 7 Page - Aeroflex Circuit Technology |
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CT1995-20 Datasheet(HTML) 7 Page - Aeroflex Circuit Technology |
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7 / 25 page  Aeroflex Circuit Technology SCDCT1995 REV A 11/21/01 Plainview NY (516) 694-6700 7 Pin Description Signal Hybrid Sink or Source Signal Description RX DATA 0/1 SINK Positive Date In. This should be a TTL description of the positive, half of the Manchester code data on the bus. It should be driven to a logic level “1” when a predetermined positive threshold is exceeded on the bus. RX DATA 0/1 SINK Negative Data In. This should be a TTL description of the negative half of the Manchester code data on the bus. It should be driven to a logic level “1” when a predetermined negative threshold is exceeded on the bus. TX INHIBIT 0/1 SOURCE Transmitter Enable. Goes low when the transmitter is transmitting. Should be used to enable the bus drivers. TX DATA SOURCE Positive Data Out - When this signal goes high the bus should be driven positive. TX DATA SOURCE Negative Data Out - When this signal goes high the bus should be driven negative. RTAD 0-4 SINK RT address lines - These should be hardwired by the user. RTAD4 is the most significant bit. RTADPAR SINK RT address parity line - This must be hardwired by the user to give odd parity. BCSTEN 0/1 SINK Recognition of Broadcast command enable - When low the recognition of broadcast command is prevented on the specified bus. 6MCK SINK 6 Megahertz master clock. IH 08 IH 19 IH 210 IH 311 IH 412 IH 513 IH614 IH715 SINK/SOURCE Internal Highway - Bi-directional 8 bit highway on which 16 bit words are passed in two bytes. IH 715 is the most significant bit of each byte, the most significant byte being transferred first. The highway should only be driven by the subsystem when data is to be transferred to the RT. DTRQ SOURCE Data Transfer Request - Goes low to request a data transfer between the ASIC and subsystem. Goes high at the end of the transfer. DTAK SINK Data Transfer Acknowledge - Goes low to indicate that the subsystem is ready for the data transfer. IUSTB SOURCE Interface Unit Strobe - This is a double pulse strobe used to transfer the two bytes of data H/L SOURCE High/Low - Indicates which byte of data is on the internal highway. Logic level "0" for least significant byte. GBR SOURCE Good Block Received - Pulses low for 500ns when a block of data has been received by the ASIC and has passed all the validity and error checks. NBGT SOURCE New Bus Grant - Pulses low whenever a new command is accepted by the ASIC. TX/RX SOURCE Transmit/Receive - The state of this line informs the subsystem whether it is to transmit or receive data The signal is valid while INCMD is low. INCMD SOURCE In Command - Goes low when the RT is servicing a valid command. The subaddress and word count lines are valid while the signal is low. WC 0-4 SOURCE Word Count - These five lines specify the requested number of data words to be received or transmitted. Valid when INCMD is low. |
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