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AM79C90PC Datenblatt(PDF) 7 Page - Advanced Micro Devices |
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AM79C90PC Datenblatt(HTML) 7 Page - Advanced Micro Devices |
7 / 62 page Am79C90 7 PRELIMINARY READ (Input/Output, Three-State) Indicates the type of operation to be performed in the current bus cycle. This signal is an output when the C-LANCE is a Bus Master. High — Data is taken off the DAL lines by the C-LANCE. Low — Data is placed on the DAL lines by the C-LANCE. The signal is an input when the C-LANCE is a Bus Slave. High — Data is placed on the DAL lines by the C-LANCE. Low — Data is taken off the DAL lines by the C-LANCE. READY (Input/Output, Open Drain) When the C-LANCE is a Bus Master, READY is an asynchronous acknowledgment from the bus memory that it will accept data in a WRITE cycle or that it has put data on the DAL lines in a READ cycle. As a Bus Slave, the C-LANCE asserts READY when it has put data on the DAL lines during a READ cycle or is about to take data off the DAL lines during a write cycle. READY is a response to DAS and will return High after DAS has gone High. READY is an input when the C-LANCE is a Bus Master and an output when the C-LANCE is a Bus Slave. RENA Receive Enable (Input) A logical input that indicates the presence of carrier on the channel. RESET Reset (Input) Reset causes the C-LANCE to cease operation, clear its internal logic, force all three-state buffers to the high- impedance state, and enter an idle state with the stop bit of CSR0 set. It is recommended that a 3.3 k Ω pullup resistor be connected to this pin. RX Receive (Input) Receive Input Bit Stream. TCLK Transmit Clock (Input) 10 MHz clock. TENA Transmit Enable (Output) Transmit Output Bit Stream enable. When asserted, it enables valid transmit output (TX). TX Transmit (Output) Transmit Output Bit Stream. V DD Power Supply Pin +5 V ±5% It is recommended that 0.1 µF and 10 µF decoupling capacitors be used between V DD and VSS. V SS Ground Pin 1 and 24 (48-Pin DlPs) should be connected together externally, as close to the chip as possible. |
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Ähnliche Beschreibung - AM79C90PC |
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