An Overview Study on USB OTG Device ISP1761
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The document provides an overview of the ISP1761 USB OTG device from ST-NXP Wireless. It describes the device's features such as supporting high-speed USB data transfer and functioning as either a host or peripheral device. It also outlines the device's internal architecture including its USB ports, clocking scheme, and endpoint description. Application examples and connection diagrams are provided.
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An Overview Study on USB OTG Device ISP1761
- 8. Internal Hub
- 10. Interrupts The ISP1761 will assert the IRQ according to the source or event in the HcInterrupt register. The main steps to enable the IRQ assertion are: 1. Set GLOBAL_INTR_EN (bit 0) in the HW Mode Control register. 2. Define the IRQ active as level or edge in INTR_LEVEL (bit 1) of the HW Mode Control register. 3. Define the IRQ polarity as active LOW or active HIGH in INTR_POL (bit 2) of the HW Mode Control register. These settings must match IRQ settings of the host processor. By default, interrupt is level-triggered and active LOW. 4. Program the individual Interrupt Enable bits in the HcInterruptEnable register. The software will need to clear the Interrupt Status bits in the HcInterrupt register before enabling individual interrupt enable bits. The interrupt for each endpoint can individually be controlled through the associated IEPnRX or IEPnTX bits. All interrupts can globally be disabled through bit GLINTENA in the Mode register
- 11. Phase-Locked Loop (PLL) Clock Multiplier The internal PLL requires a 12 MHz input, which can be a 12 MHz crystal or a 12 MHz clock already existing in the system with a precision better than 50 ppm. This allows the use of a low-cost 12 MHz crystal that also minimizes Electro-Magnetic Interference (EMI). When an external crystal is used, make sure the CLKIN pin is connected to VCC(I/O). The PLL block generates all the main internal clocks required for normal functionality of various blocks: 30 MHz, 48 MHz and 60 MHz.
- 12. ISP1761 Power Supply Connection
- 14. Power-On Reset (POR) Clock with respect to the external power-on reset Internal power-on reset timing
- 15. Memory Segmentation and Access Block Diagram
- 16. OTG Controller A-device State Diagram
Editor's Notes
- Welcome to the training module on xxx.
- The ISP1761 is a single-chip Hi-Speed Universal Serial Bus (USB) On-The-Go (OTG) Controller integrated with advanced ST-NXP Wireless slave host controller and the ST-NXP Wireless ISP1582 peripheral controller. The Hi-Speed USB host controller and peripheral controller comply to “Universal Serial Bus Specification Rev. 2.0” and support data transfer speeds of up to 480 Mbit/s. The Enhanced Host Controller Interface (EHCI) core implemented in the host controller is adapted from “Enhanced Host Controller Interface Specification for Universal Serial Bus Rev. 1.0”. The OTG controller adheres to “On-The-Go Supplement to the USB Specification Rev. 1.3”. The ISP1761 has three USB ports. Port 1 can be configured to function as a downstream port, an upstream port or an OTG port; ports 2 and 3 are always configured as downstream ports. The OTG port can switch its role from host to peripheral, and peripheral to host. The OTG port can become a host through the Host Negotiation Protocol (HNP) as specified in the OTG supplement.
- This slide gives you features about OTG controller-specific and Peripheral controller-specific features.
- The ISP1761 can be used to implement a dual-role USB device in any application, USB host or USB peripheral, depending on the cable connection. If the dual-role device is connected to a typical USB peripheral, it behaves like a typical USB host. The dual-role device can also be connected to a PC or any other USB host and behave like a typical USB peripheral.
- Here is a Typical Internal connection Diagram of the Device ISP1761. it has Generic processor interface block which has memory management unit slave DMA controller, Interrupt controller, Hardware configuration registers. Transaction translator and RAM which is interconnected to USB full speed High speed data path, it has 3 USB ATX blocks/ports, EHCI and operational register block, PD and payload memory block, PLL block…Etc
- The EHCI block and the Hi-Speed USB hub block are the main components of the advanced ST-NXP Wireless slave host controller. The internal Hi-Speed USB hub block replaces the companion host controller block used in the original architecture of a Peripheral Component Interconnect (PCI) Hi-Speed USB host controller to handle full-speed and low-speed modes. The hardware architecture in the ISP1761 is simplified to help reduce cost and development time, by eliminating the additional work involved in implementing the OHCI software required to support full-speed and low-speed modes. The ISP1761 implements an EHCI that has an internal port, the root hub port which is not available externally, on which the internal hub is connected. The three external ports are always routed to the internal hub.
- The ISP1761 implements an EHCI that has an internal port, the root hub port (not available externally), on which the internal hub is connected. The three external ports are always routed to the internal hub. The internal hub is a Hi-Speed USB hub including the TT.
- The ISP1761 has three ports Port 2 does not need to be enabled using software if only port 1 or port 3 is used. No port needs to be disabled by external pull-up resistors, if not used. The DP and DM of the unused ports need not be externally pulled HIGH because there are internal pull-down resistors on each port that are enabled by default.
- All the interrupt events are represented by the respective bits allocated in the HcInterrupt register. There is no mechanism to show the order or the moment occurrence of an interrupt. The asserted bits in the HcInterrupt register can be cleared by writing back the same value to the HcInterrupt register. This means that writing logic 1 to each of the set bits will reset that corresponding bits to the initial inactive state.
- Here we says about the Phase-Locked Loop clock multiplier which is present inside the device. It accepts 12Mhz input it can be from crystal or from external clock. It generates 30Mhz and 60Mhz output which is required for normal functionalities
- This slide shows a typical Power supply connection to ISP1761. A 4.7 mF-to-10 mF electrolytic or tantalum capacitor is required on any one of the pins 5, 50 or 118. All the electrolytic or tantalum capacitors must be of LOW ESR type (0.2 W to 2 W). In hybrid mode, VCC(5V0) can be switched off using an external PMOS transistor, controlled using one of the GPIO pins of the processor. This helps to reduce the suspend current, ICC(I/O), below 100 mA. If the ISP1761 is used in hybrid mode and VCC(5V0) is off during suspend, a 2 ms reset pulse is required when power is switched back on, before the resume programming sequence starts.
- ISP1761 has overcurrent detection built inside, The range of the overcurrent detection voltage for the ISP1761 is 45 mV to 100 mV. The port power will automatically be disabled by the ISP1761 on an overcurrent event occurrence, by de-asserting the PSWn_N signal without any software intervention. The digital overcurrent scheme requires using an external power switch with integrated overcurrent detection, such as LM3526, MIC2526 (2 ports) or LM3544 (4 ports). These devices are controlled by PSWn_N signals corresponding to each port.
- When VCC(I/O) is directly connected to the RESET_N pin, the internal POR pulse width, tPORP, will typically be 800 ns. The pulse is started when VCC(5V0) rises above VTRIP of 1.2 V. The recommended RESET input pulse length at power-on must be at least 2 ms to ensure that internal clocks are stable. The RESET_N pin can be either connected to VCC(I/O), using the internal POR circuit or externally controlled by the microcontroller, ASIC, and so on.
- The internal addressable host controller buffer memory is 63 kB. The ISP1761 is a slave host controller. This means that it does not need access to the local bus of the system to transfer data from the system memory to the ISP1761 internal memory, Therefore, correct data must be transferred to both the Proprietary Transfer Descriptor (PTD) area and the payload area by PIO (using CPU access) or programmed DMA. The RAM is structured in blocks of Proprietary Transfer Descriptor and payloads so that while the USB is executing on an active transfer-based Proprietary Transfer Descriptor , the processor can simultaneously fill up another block area in the RAM. A Proprietary Transfer Descriptor and its payload can then be updated on-the-fly without stopping or delaying any other USB transaction or corrupting the RAM data.
- The OTG state machine is implemented with software. The inputs to the state machine come from four sources: hardware signals from the USB bus, software signals from the application program, internal variables with the state machines, and timers: The OTG state machine is the software behind all the OTG functionality. It is implemented in the microprocessor system that is connected to the ISP1761. The ISP1761 provides registers for all input status, the output control and timers to fully support the state machine transitions. The register involved in this operation are: OTG Control register, OTG Status register, OTG Interrupt Latch register, OTG Interrupt Enable Fall and OTG Interrupt Enable Rise registers, OTG Timer register.
- Here we explain about the Endpoint description, An endpoint acts as a terminus of a communication flow between the USB host and the USB peripheral. an End point is assigned unique Address or identifier before any transfer of data is established. an Endpoint can be of Interrupt type, asochronous type, or Bulk type depending on the type of data transfer required.
- Thank you for taking the time to view this presentation on ISP1761 . If you would like to learn more or go on to purchase some of these devices, you may either click on the part list link, or simple call our sales hotline. For more technical information you may either visit the ST-NXP Wireless site, or if you would prefer to speak to someone live, please call our hotline number, or even use our ‘live chat’ online facility.