Configuration Handbook - Kamami.pl

Device Configuration Using Flash Memory & MAX 3000A DevicesGetting Data from the PC or MicroprocessorThe PC or microprocessor uses the parallel port to interface with thecontroller. There are two types of signals involved in this connection (seeFigure 10–3), a 3-bit input signal from the PC or microprocessor to thecontroller, and a 2-bit output signal from the controller to the PC ormicroprocessor. The input signal includes the following three signals:■■■STB: Strobe signal from the PC or microprocessor to indicate that thePC or microprocessor's data is valid.data_mode: Indicates whether the controller is in command mode ordata mode. When data_mode is high, the controller is in commandmode; when data_mode is low, the controller is in data mode.data: Content of this signal depends on data_mode. It can be data forcommand mode or data mode.The output signal contains the following two signals:■■ACK: Acknowledge signal is a handshaking signal from thecontroller to the PC or microprocessor.conf_status: Indicates configuration status.Figure 10–3. Getting Data from PC or Microprocessor(1) (1)STBData_modeCMD ModeData ModeDataNote to Figure 10–3:(1) Data is sent on both positive and negative edges of the STB signal.10–4 Altera CorporationConfiguration Handbook, Volume 2 April 2007