WB_IRRC - Pin Description
The following pin description is for the WB_IRRC when used on the schematic. In an OpenBus System, although the same signals are present, the abstract nature of the system hides the pin-level Wishbone interfaces. The external interface signals to the IR Transceiver will be made available as sheet entries, associated with the parent sheet symbol used to reference the underlying OpenBus System.
Table 1. WB_IRRC pin description.| Name | Type | Polarity/ Bus size | Description |
|---|---|---|---|
| Control Signals | |||
| CLK_I | I | Rise | External (system) clock signal |
| RST_I | I | High | External (system) reset |
| Host Processor Interface Signals | |||
| STB_I | I | High | Strobe signal. When asserted, indicates the start of a valid Wishbone data transfer cycle |
| CYC_I | I | High | Cycle signal. When asserted, indicates the start of a valid Wishbone cycle |
| ACK_O | O | High | Standard Wishbone device acknowledgement signal. When this signal goes high, the WB_IRRC (Wishbone Slave) has finished execution of the requested action and the current bus cycle is terminated |
| ADR_I | I | 4 | Address bus, used to select an internal register of the device for writing to/reading from |
| DAT_O | O | 32 | Data to be sent to host processor |
| DAT_I | I | 32 | Data received from host processor |
| WE_I | I | Level | Write enable signal. Used to indicate whether the current local bus cycle is a Read or Write cycle: 0 = Read |
| INT_O | O | High | Interrupt output line. An interrupt will be generated and sent to the connected processor on this line if the inten bit in the Control register (CTRL.0) is set and the rxint bit in the Status register (STATUS.0) becomes set. |
| IR Transceiver Interface Signals (see note 1) | |||
| TXD_LED_O (see note 2) | O | High | Transmit LED Driver. Used to switch an independent LED associated with IR Transmitter ON or OFF. This line will be taken High during data transmission. |
| TXD_O | O | High | Transmit Output. Connects to the TXD input pin of the IR Transceiver. This output depends on the operational mode configured for the WB_IRRC:
|
| RXD_LED_O (see note 2) | O | High | Receiver LED driver. Used to switch an independent LED associated with IR Receiver ON or OFF. This line will be taken High when the WB_IRRC detects received IR bursts. |
| RXD_I | I | Low | Receive Input. Connects to the RXD output of the IR Transceiver, which provides the modulated data signal. |
| SD_O | O | High | Shutdown. Connects to the SD pin of the IR Transceiver. This output is internally tied Low. |
| MODE_O | O | Level | Mode Selection. Connects to the Mode pin of the IR Transceiver. This output is internally tied Low. Note: For carrier-based remote control IR communications, the speeds involved are very low, so the IR Transceiver module must be set to operate in SIR mode (slow infrared: 2.4kbit/s to 115.2kbit/s). The TFDU6102 Transceiver on the PB03 is set to operate in SIR mode by default, when powered on. Simply cycling the power of the NB2DSK01 into which the peripheral board PB03 is plugged, will achieve the required mode for infrared remote control communications. |
Notes
- Based on connection to the TFDU6102 Fast Infrared Transceiver device found on Altium's USB-IrDA-Ethernet Peripheral Board PB03. This peripheral board plugs into the Desktop NanoBoard NB2DSK01.
- The LEDs to which these signals connect are not part of the TFDU6102 FIR Transceiver device. Furthermore, they cannot be controlled from software using the WB_IRRC.