參數(shù)資料
型號(hào): LZ85202
廠商: Sharp Corporation
英文描述: IrDA Control Host Controller with USB Interface(帶USB接口的IrDA控制主控制器)
中文描述: 紅外線控制主機(jī)控制器與USB接口(帶的USB接口的紅外線控制主控制器)
文件頁(yè)數(shù): 12/48頁(yè)
文件大小: 219K
代理商: LZ85202
LZ85202
6
IrDA Control Host Controller with USB Interface User
s Guide
Protocol Stacks
In an IrDA Control subsystem, certain procedures are required to make the infrared wire-
less communication available between a Host device and Peripherals. These required pro-
cedures are described below.
Enumeration Sequence
Enumeration is a registration procedure where the Peripherals will be acknowledged and
registered to the Host device. The Host device does not know what kind of and/or how
many Peripherals exist at the beginning. Thus, upon receipt of an Enumeration request
from the Peripheral, the Host device will send its specific information to the Peripheral and
register it, so that infrared communication can be initiated. Figure 5 shows an actual Enu-
meration sequence between the Host device and the Peripheral.
In Figure 5 numbers 1 through 4 illustrate the types of data packets for the Host and the
Peripheral. Explanation for the Enumeration sequence is as described below.
1. Peripheral will always send the Enum-Wakeup packet to the Host device to request
the polling.
2. The Host device that received the above request from the Peripheral will then send
Enum-Hailing packet so that it can receive the information from the Peripheral. At this
time, the Host device will add Host Address, HostID, and HostInfo, which identify the
Host device itself.
3. The Peripheral obtains the Host information (HostID, HostInfo) out of the Enum-Hailing
packet from the Host device, and then request Enumeration with this Host device by
Enum-Request.
The Host device will then acknowledge the Enumeration completion to the Peripheral,
which requested the Enumeration with this Host device.
Figure 5. Enumeration Sequence
PADD: 0xF
HADD:
α
HostID, HostInfo
PADD: 0xF
HADD:
α
PFID
NOTES:
PADD: Peripheral Address
HADD: Host Address
PADD: 0xF
PADD: 0xF
HADD:
α
HostID, HostInfo, PFID
LZ85202-5
(1) ENUM-WAKEUP
(2) ENUM-HAILING
(3) ENUM-REQUEST
(4) ENUM-RESPONSE
HOST
PERIPHERAL
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