參數(shù)資料
型號: ISP1362
廠商: NXP Semiconductors N.V.
英文描述: Single-chip Universal Serial Bus On-The-Go controller
中文描述: 單芯片通用串行總線和On - The - Go控制器
文件頁數(shù): 121/150頁
文件大?。?/td> 647K
代理商: ISP1362
Philips Semiconductors
ISP1362
Single-chip USB OTG controller
Product data
Rev. 03
06 January 2004
121 of 150
9397 750 12337
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
16.2.3
Stall Endpoint or Unstall Endpoint (40H
4FH/80H
8FH)
These commands are used to stall or unstall an endpoint. The commands modify the
content of the DcEndpointStatus register (see
Table 124
).
A stalled control endpoint is automatically unstalled when it receives a SET-UP token,
regardless of the packet content. If the endpoint should stay in its stalled state, the
microprocessor can re-stall it with the Stall Endpoint command.
When a stalled endpoint is unstalled (either by using the Unstall Endpoint command
or by receiving a SET-UP token), it is also re-initialized. This
fl
ushes the buffer: if it is
an OUT buffer, it waits for a DATA 0 PID; if it is an IN buffer, it writes a DATA 0 PID.
Code (Hex): 40 to 4F
stall (control OUT, control IN, endpoint 1 to 14)
Code (Hex): 80 to 8F
unstall (control OUT, control IN, endpoint 1 to 14)
Transaction
none (code only)
Table 124: DcEndpointStatus register: bit allocation
Bit
7
Symbol
EPSTAL
6
5
4
3
2
1
0
EPFULL1
EPFULL0
DATA_PID
OVER
WRITE
0
R
SETUPT
CPUBUF
reserved
Reset
Access
0
R
0
R
0
R
0
R
0
R
0
R
-
-
Table 125: DcEndpointStatus register: bit description
Bit
Symbol
7
EPSTAL
Description
This bit indicates whether the endpoint is stalled or not
(1 = stalled; 0 = not stalled).
Set to logic 1 by a Stall Endpoint command, cleared to logic 0 by
an Unstall Endpoint command. The endpoint is automatically
unstalled on receiving a SET-UP token.
Logic 1 indicates that the secondary endpoint buffer is full.
Logic 1 indicates that the primary endpoint buffer is full.
This bit indicates the data PID of the next packet (0 = DATA PID;
1 = DATA1 PID).
This bit is set by hardware. Logic 1 indicates that a new Set-up
packet has overwritten the previous set-up information, before it
was acknowledged or before the endpoint was stalled. This bit is
cleared by reading, if writing the set-up data has
fi
nished.
Firmware must check this bit before sending an Acknowledge
Set-up command or stalling the endpoint. Upon reading logic 1,
the
fi
rmware must stop ongoing set-up actions and wait for a
new Set-up packet.
Logic 1 indicates that the buffer contains a Set-up packet.
This bit indicates which buffer is currently selected for CPU
access (0 = primary buffer; 1 = secondary buffer).
reserved
6
5
4
EPFULL1
EPFULL0
DATA_PID
3
OVERWRITE
2
1
SETUPT
CPUBUF
0
-
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