參數(shù)資料
型號(hào)： μPD9210FGC-7EA
廠商： NEC Corp.
英文描述： USB Host Controller(USB主控制器)
中文描述： USB主機(jī)控制器（的USB主控制器）
文件頁(yè)數(shù)： 34/95頁(yè)
文件大?。?/td> 423K
代理商： ΜPD9210FGC-7EA
CHAPTER 3 DESCRIPTION OF USB HOST CONTROLLER FUNCTIONS
34
3.3.2 Endpoint descriptor field definitions
Table 3-1. Description of Endpoint Descriptors
Name
HC Access
Description
FA
R
Function Address
USB address of function that includes the endpoint that is controlled by this ED
EN
R
Endpoint Number
Endpoint address in function
Direction
Indicates the data flow direction (IN or OUT). If neither IN nor OUT are specified, the transfer
direction is defined by the TD’s PID (Packet ID) field.
Code
Direction
00b
01b
10b
11b
Get direction From TD
OUT
IN
Get direction From TD
D
R
S
R
Speed
This indicates the endpoint’s speed.
full-speed (S = 0)
low-speed (S = 1)
K
R
Skip
When this bit is set, the HC proceeds to the next ED without accessing the TD queue or issuing
a USB token to the endpoint.
F
R
Format
This indicates the format of a TD that is linked to this ED. For control, bulk, or interrupt
endpoints, if F = 0, then the General TD format is used. For isochronous endpoints, if F = 1, the
Isochronous TD format is used.
MPS
R
Maximum Packet Size
This field indicates the maximum number of bytes (1024 bytes) per data packet that can be
received from the endpoint or sent to an endpoint. When a write operation (OUT or SETUP) is
executed from the HC to the endpoint, the size of the data packet to be sent always becomes
either the Maximum Packet Size or the size of the data in the buffer, whichever is smaller.
When a read operation (IN) is executed from the endpoint to the HC, the data packet size is
determined according to the endpoint.
TailP
R
TD Queue Tail Pointer
When TailP and HeadP have the same value, the list does not contain any TDs that can be
serviced by the HC. When the TailP and HeadP values are different, the list contains TDs.
H
R/W
Halted
This bit is set by the HC to indicate when servicing of the endpoint TD queue has been
suspended due to a normal TD servicing error.
C
R/W
toggle Carry
This bit is the data toggle carry bit. When a TD is retired, the final data toggle value (LSb in the
data Toggle field) that was used by the retired TD is written. This field cannot be used by
isochronous endpoints.
HeadP
R/W
TD Queue Head Pointer
This indicates the next TD to be serviced at this endpoint.
NextED
R
Next ED
When its value is other than zero, this bit indicates the next ED.
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