參數(shù)資料
型號(hào): 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(yè)數(shù): 124/150頁(yè)
文件大?。?/td> 647K
代理商: ISP1362
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Philips Semiconductors
ISP1362
Single-chip USB OTG controller
Product data
Rev. 03
06 January 2004
124 of 150
9397 750 12337
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
16.3.2
Unlock Device (B0H)
This command unlocks the DC from write-protection mode after a
resume
. In the
suspend
state, all registers and buffer memory are write-protected to prevent data
corruption by external devices during a
resume
. Also, the register access for reading
is possible only after the
unlock device
command is executed.
After waking up from the
suspend
state, the
fi
rmware must unlock the registers and
buffer memory by using this command, by writing the unlock code (AA37H) into the
DcLock register (8-bit bus: lower byte
fi
rst). The bit allocation of the DcLock register is
given in
Table 131
.
Code (Hex): B0
unlock the device
Transaction
write 2 bytes (unlock code) (code or data)
5
4 to 1
0
-
ERROR[3:0]
RTOK
reserved
Error code. For error description, see
Table 130
.
Logic 1 indicates that data was successfully received or
transmitted.
Table 130: Transaction error codes
Error code
(Binary)
0000
no error
0001
PID encoding error; bits 7 to 4 are not the inverse of bits 3 to 0
0010
PID unknown; encoding is valid, but PID does not exist
0011
unexpected packet; packet is not of the expected type (token, data or
acknowledge) or is a SET-UP token to a non-control endpoint
0100
token CRC error
0101
data CRC error
0110
time-out error
0111
babble error
1000
unexpected end-of-packet
1001
sent or received NAK (Not AcKnowledge)
1010
sent Stall; a token was received, but the endpoint was stalled
1011
over
fl
ow; the received packet was larger than the available buffer space
1100
sent empty packet (ISO only)
1101
bit stuf
fi
ng error
1110
sync error
1111
wrong (unexpected) toggle bit in DATA PID; data was ignored
Description
Table 129: DcErrorCode register: bit description
continued
Bit
Symbol
Description
Table 131: DcLock register: bit allocation
Bit
15
Symbol
Reset
1
Access
W
14
13
12
11
10
9
8
UNLOCK[15:8] = AAH
0
W
0
W
1
W
1
W
0
W
1
W
0
W
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