參數(shù)資料
型號(hào): ISP1183BS,157
廠商: ST-ERICSSON
元件分類: 總線控制器
英文描述: UNIVERSAL SERIAL BUS CONTROLLER, PQCC32
封裝: 5 X 5 MM, 0.85 MM HEIGHT, PLASTIC, MO-220, SOT-617-1, HVQFN-32
文件頁(yè)數(shù): 32/65頁(yè)
文件大?。?/td> 306K
代理商: ISP1183BS,157
ISP1183_2
NXP B.V. 2007. All rights reserved.
Product data sheet
Rev. 02 — 7 June 2007
38 of 65
NXP Semiconductors
ISP1183
Low-power USB Peripheral Controller with DMA
12.4.2 Unlock Device (B0h)
This command unlocks the ISP1183 from write-protection mode after a resume. In the
suspend state, all registers and FIFOs 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, rmware must unlock registers and FIFOs using
this command, by writing the unlock code (AA37h) into the Lock register (8-bit bus: lower
byte rst). The bit allocation of the Lock register is given in Table 39.
Code: B0h — unlock the device
Transaction — write 2 bytes (unlock code)
Table 38.
Transaction error codes
Error code
(binary)
Description
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 SETUP 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
overow; the received packet was larger than the available buffer space
1100
sent empty packet (ISO only)
1101
bit stufng error
1110
sync error
1111
wrong (unexpected) toggle bit in DATA PID; data was ignored
Table 39.
Lock register: bit allocation
Bit
15
14
13
12
11
10
9
8
Symbol
UNLOCKH[7:0] = AAh
Reset
10101010
Access
WWWWWWWW
Bit
7
6
5
4
3
2
1
0
Symbol
UNLOCKL[7:0] = 37h
Reset
00110111
Access
WWWWWWWW
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