Microprocessors LCD Parallel Port USB Port
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1 Microprocessors LCD Parallel Port USB Port H. Abdoli Bu-Ali Sina University 1
2 New LCDs Interfacing Lower prices Display numbers, characters, graphics Integrated refreshing controller Ease of programming H. Abdoli Bu-Ali Sina University 2
3 Pin Description H. Abdoli Bu-Ali Sina University 3
4 Command Codes H. Abdoli Bu-Ali Sina University 4
5 Example H. Abdoli Bu-Ali Sina University 5
6 LCD Timing H. Abdoli Bu-Ali Sina University 6
7 LCD Instructions H. Abdoli Bu-Ali Sina University 7
8 Printer Connection H. Abdoli Bu-Ali Sina University 8
9 IO Base Address for LPT H. Abdoli Bu-Ali Sina University 9
10 Printer s Ports H. Abdoli Bu-Ali Sina University 10
11 USB Universal Serial Bus H. Abdoli Bu-Ali Sina University 11
12 Motivations Connection of the PC to Telephone The USB provides a link that can be used across a wide range of PC-to-telephone interconnects. Ease of use Hot plug Port expansion The lack of a bi-directional, low-cost, low-to-mid speed peripheral bus has held back the creative proliferation of peripherals such as telephone/fax/modem adapters, answering machines, scanners, PDA s, keyboards, mice, etc. H. Abdoli Bu-Ali Sina University 12
13 USB Fast Bi-directional low-cost dynamically attachable serial interface consistent with the requirements of the PC platform of today and tomorrow H. Abdoli Bu-Ali Sina University 13
14 Goals for USB The following criteria were applied in defining the architecture for the USB: Ease-of-use for PC peripheral expansion Low-cost solution that supports transfer rates up to 12Mb/s Full support for real-time data for voice, audio, and compressed video Protocol flexibility for mixed-mode isochronous data transfers and asynchronous messaging Integration in commodity device technology Comprehension of various PC configurations and form factors Provision of a standard interface capable of quick diffusion into product Enabling of new classes of devices that augment the PC s capability. H. Abdoli Bu-Ali Sina University 14
15 Taxonomy of Application Space H. Abdoli Bu-Ali Sina University 15
16 Feature list Easy to use for end user Single model for cabling and connectors Electrical details isolated from end user (e.g., bus terminations) Self-identifying peripherals, automatic mapping of function to driver, and configuration Dynamically attachable and re-configurable peripherals Wide range of workloads and applications Suitable for device bandwidths ranging from a few kb/s to several Mb/s Supports isochronous as well as asynchronous transfer types over the same set of wires Supports concurrent operation of many devices (multiple connections) Supports up to 127 physical devices Supports transfer of multiple data and message streams between the host and devices Allows compound devices (i.e., peripherals composed of many functions) Lower protocol overhead, resulting in high bus utilization H. Abdoli Bu-Ali Sina University 16
17 Feature list (con) Isochronous bandwidth Guaranteed bandwidth and low latencies appropriate for telephony, audio, etc. Isochronous workload may use entire bus bandwidth Flexibility Supports a wide range of packet sizes, which allows a range of device buffering options Allows a wide range of device data rates by accommodating packet buffer size and latencies Flow control for buffer handling is built into the protocol Robustness Error handling/fault recovery mechanism is built into the protocol Dynamic insertion and removal of devices is identified in user-perceived real-time Supports identification of faulty devices H. Abdoli Bu-Ali Sina University 17
18 Feature list (con) Relation with PC industry Protocol is simple to implement and integrate Consistent with the PC plug-and-play architecture Leverages existing operating system interfaces Low-cost implementation Low-cost sub-channel at 1.5Mb/s Optimized for integration in peripheral and host hardware Suitable for development of low-cost peripherals Low-cost cables and connectors Uses commodity technologies Upgrade path Architecture upgradeable to support multiple USB Host Controllers in a system H. Abdoli Bu-Ali Sina University 18
19 USB System Description USB interconnect USB devices USB host. H. Abdoli Bu-Ali Sina University 19
20 USB Interconnect Bus Topology: Connection model between USB devices and the host. Inter-layer Relationships: In terms of a capability stack, the USB tasks that are performed at each layer in the system. Data Flow Models: The manner in which data moves in the system over the USB between producers and consumers. USB Schedule: The USB provides a shared interconnect. Access to the interconnect is scheduled in order to support isochronous data transfers and to eliminate arbitration overhead. H. Abdoli Bu-Ali Sina University 20
21 BUS Topology H. Abdoli Bu-Ali Sina University 21
22 Physical Interface pin Name Vcc D- D+ GND Descryption +5 Vdc Data- Data+ Ground H. Abdoli Bu-Ali Sina University 22
23 Throughput Low speed 1.5 Mbps Full speed 12 Mbps High speed (in USB 2.0) 480 Mbps Dynamic mode switching Clock encoding scheme: NRZI (Non Return to Zero Invert) H. Abdoli Bu-Ali Sina University 23
24 Power Distribution Devices: Bus-powered devices Self-powered devices Power management Host based Power events:» Suspend» Resume H. Abdoli Bu-Ali Sina University 24
25 Bus Protocol Polled bus Data transfers initiated only by host controller Three packets: Token packet» Type» Direction» Address» End point number Data packet Handshake packet» ACK» NAK H. Abdoli Bu-Ali Sina University 25
26 Transfer Model Pipe Stream pipes» No USB standard format Message pipes» USB format Request Data Status End point zero Default control pipe Always exists H. Abdoli Bu-Ali Sina University 26
27 Data Flow Types Control Transfers: Used to configure a device at attach time and can be used for other device-specific purposes, including control of other pipes on the device. Bulk Data Transfers: Generated or consumed in relatively large and bursty quantities. Interrupt Data Transfers: Used for characters or coordinates with human-perceptible echo or feedback response characteristics. Isochronous Data Transfers: Occupy a pre-negotiated amount of USB bandwidth with a pre-negotiated delivery latency. (Also called streaming real time transfers). H. Abdoli Bu-Ali Sina University 27
28 USB Devices All have endpoint zero Hub Function Compound H. Abdoli Bu-Ali Sina University 28
29 Typical Configuration H. Abdoli Bu-Ali Sina University 29
30 Host Responsibility Detecting the attachment and removal of USB devices Managing control flow between the host and USB devices Managing data flow between the host and USB devices Collecting status and activity statistics Providing power to attached USB devices. H. Abdoli Bu-Ali Sina University 30
31 Implementer Viewpoints USB Physical Device: A piece of hardware on the end of a USB cable that performs some useful end user function. Client Software: Software that executes on the host, corresponding to a USB device. This client software is typically supplied with the operating system or provided along with the USB device. USB System Software: Software that supports the USB in a particular operating system. The USB System Software is typically supplied with the operating system, independently of particular USB devices or client software. USB Host Controller (Host Side Bus Interface): The hardware and software that allows USB devices to be attached to a host. H. Abdoli Bu-Ali Sina University 31
32 USB Implementation Areas H. Abdoli Bu-Ali Sina University 32
33 Physical / Logical Bus Topology H. Abdoli Bu-Ali Sina University 33
34 USB Host / Device View H. Abdoli Bu-Ali Sina University 34
35 USB Communication Flow H. Abdoli Bu-Ali Sina University 35
36 Control Transfer Format Setup packet Data packet Acknowledge packet USB defined structure Setup packet: 8 bytes Maximum data payload size: Full speed: 8, 16, 32 or 64 bytes Low speed: 8 bytes H. Abdoli Bu-Ali Sina University 36
37 Control Transfer Constraints Best effort 10% frame time for control Use also remaining 90% if no interrupt or isochronous transfer H. Abdoli Bu-Ali Sina University 37
38 Full-Speed Control Transfer Limits H. Abdoli Bu-Ali Sina University 38
39 Low Speed Control Transfer Limits H. Abdoli Bu-Ali Sina University 39
40 Isochronous Transfers Guaranteed access to USB bandwidth with bounded latency Guaranteed constant data rate through the pipe as long as data is provided to the pipe In the case of a delivery failure due to error, no retrying of the attempt to deliver the data. Stream pipe Uni-directional Maximum data payload: 1023 bytes Only in Full speed. No more 90% of frame for isochronous, interrupt H. Abdoli Bu-Ali Sina University 40
41 Isochronous Limits H. Abdoli Bu-Ali Sina University 41
42 Interrupt Transfers Guaranteed maximum service period for the pipe. Retry of transfer attempts at the next period, in the case of occasional delivery failure due to error on the bus. Max. Payload size: Full speed: 64 bytes Low speed: 8 bytes If there is sufficient bus time, for requested payload size the pipe is established. H. Abdoli Bu-Ali Sina University 42
43 Full Speed Interrupt Limits H. Abdoli Bu-Ali Sina University 43
44 Low Speed Interrupt Limits H. Abdoli Bu-Ali Sina University 44
45 Bulk Transfers Large amount of data. Access to the USB on a bandwidth-available basis. Retry of transfers, in the case of occasional delivery failure due to errors on the bus. Guaranteed delivery of data, but no guarantee of bandwidth or latency. Stream pipe Only in full speed Max. Payload: only 8, 16, 32 or 64 bytes H. Abdoli Bu-Ali Sina University 45
46 Bulk Transfer Limits H. Abdoli Bu-Ali Sina University 46
47 Connectors H. Abdoli Bu-Ali Sina University 47
48 Full Speed CMOS Driver H. Abdoli Bu-Ali Sina University 48
49 Evaluation Setup H. Abdoli Bu-Ali Sina University 49
50 NRZI Encoding H. Abdoli Bu-Ali Sina University 50
51 Bit Stuffing H. Abdoli Bu-Ali Sina University 51
52 Flow Diagram for Bit Stuffing H. Abdoli Bu-Ali Sina University 52
53 Signaling Levels H. Abdoli Bu-Ali Sina University 53
54 Signals Low and Full speed devices: A differential 1 is transmitted by pulling D+ over 2.8V with a 15K ohm resistor pulled to ground and D- under 0.3V with a 1.5K ohm resistor pulled to 3.6V. A differential 0 on the other hand is a D- greater than 2.8V and a D+ less than 0.3V with the same appropriate pull down/up resistors. The receiver defines a differential 1 as D+ 200mV greater than D- and a differential 0 as D+ 200mV less thand-. The polarity of the signal is inverted depending on the speed of the bus. Therefore the terms J and K states are used in signifying the logic levels. In low speed a J state is a differential 0. In high speed a J state I s a differential 1. H. Abdoli Bu-Ali Sina University 54
55 Differential and Single Ended Differential signals mostly for data Certain bus states by single ended signals on D+, D- or both. For example a single ended zero or SE0 can be used to signify a reset if held more than 10ms. SE0 is holding down both D- and D+ below.3v Low and Full speed 90 Ohms +/- 15% H. Abdoli Bu-Ali Sina University 55
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