參數(shù)資料
型號(hào): DS2490S
廠商: MAXIM INTEGRATED PRODUCTS INC
元件分類(lèi): Bus Controller
英文描述: UNIVERSAL SERIAL BUS CONTROLLER, PDSO24
封裝: 0.300 INCH, SO-24
文件頁(yè)數(shù): 39/51頁(yè)
文件大小: 444K
代理商: DS2490S
DS2490
44 of 50
COMMUNICATION COMMANDS
bmRequestType
0x40
bRequest
COMM_CMD
wValue
byte 2
byte 1
byte 2:
0
1
SPU
F
NTF
ICP
0
byte 1:
1
0
1
R
0
1
IM
wIndex
byte 2
byte 1
byte 2 – 0X00 (unused)
byte 1 – size in bytes of preamble to be written.
wLength
0x0000
SET PATH
Setup Packet Encoding:
bmRequestType
0x40
bRequest
COMM_CMD
wValue
byte 2
byte 1
byte 2:
0
F
NTF
ICP
RST
byte 1:
1
0
1
0
1
IM
wIndex
byte 2
byte 1
byte 2 – 0X00 (unused)
byte 1 – size in bytes of number of couplers that need to be activated
to set up the path to the target device.
wLength
0x0000
WRITE SRAM PAGE
DT = 1 activates the CRC16 generator. This command is also
applicable to the Write IPR and Write I/O Buffer function of the
crypto iButton if CIB = 1. To write a partial page the page size
parameter and the target address need to be set accordingly.
Setup Packet Encoding:
bmRequestType
0x40
bRequest
COMM_CMD
wValue
byte 2
byte 1
byte 2:
0
PS
DT
0
F
NTF
ICP
0
byte 1:
1
0
1
0
1
IM
wIndex
byte 2
byte 1
byte 2 – 0X00 (unused)
byte 1 – number of bytes to be sent to the device following a 3 byte
preamble. This number is typically identical to the page size. A value
of 0x00 specifies a 256 byte page.
wLength
0x0000
WRITE EPROM
DT = 1 selects the CRC16 generator. Otherwise an 8-bit CRC is
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