參數(shù)資料
型號(hào)： UDA1325
廠商： NXP Semiconductors N.V.
元件分類(lèi)： Codec
英文描述： Universal Serial Bus USB CODEC
中文描述： 通用串行總線(xiàn)解碼器
文件頁(yè)數(shù)： 31/52頁(yè)
文件大小： 310K
代理商： UDA1325
1999 May 10
31
Philips Semiconductors
Preliminary specification
Universal Serial Bus (USB) CODEC
UDA1325
COMMAND DESCRIPTIONS
Command procedure
This chapter describes the commands that can be used by
the microcontroller to control the USB processor. There
are three basic types of commands:
Initialization commands
Data flow commands
General commands.
A command is represented by an 8 bit code. It can be
followed by one or more data write cycles or one or more
read cycles or a combination. The PSIE_MMU_READY
output connected to Port 3.4 of the microcontroller
indicates that the previous action (command write, data
read or data write) has completed. A new action can only
be initiated if PSIE_MMU_READY is TRUE. The data is
valid from the moment PSIE_MMU_READY becomes
TRUE.
The PSIE contains a number of interrupt registers, one for
each endpoint. Every time a transition occurs, the interrupt
flag for the involved endpoint is set. The PSIE_MMU_INT
connected to Port 3.3 is an OR function of all interrupt
registers.
Initialization commands
Initialization commands are used during the enumeration
process of the USB network. They are used to set the USB
assigned address, enable endpoints and select the
configuration of the device.
S
ET ADDRESS
/
ENABLE
Command: D0h.
Data: write 1 byte.
The set address/enable command is used to set the USB
assigned address and enable the function. The device
always powers up disabled and should be enabled after a
bus reset.
0
Address
Enable
0
1
2
3
4
5
6
7
0
0
0
0
0
0
0
Power On Value
Table 24
R
EAD ADDRESS
/
ENABLE
Command: D0h.
Data: read 1 byte.
The read address/enable command is used to read the
USB assigned address and the enable bit of the device.
The format of the data phase is the same as for the set
address/enable command.
S
ET ENDPOINT ENABLE
Command: D8h.
Data: write 1 byte.
The set endpoint enable command is used to set the
enable bits for the non default endpoints.
If the enable bit is ‘1’, the non default endpoints are
enabled, if ‘0’, the non default endpoints are disabled.
The function then only responds to the default control
endpoint.
After bus reset, the enable bit is set to ‘0’.
R
EAD ENDPOINT ENABLE
Command: D8h.
Data: read 1 byte.
The read endpoint enable command is used to read the
enable bit for the non default endpoints of the function.
The format of the data phase is the same as for the set
endpoint enable command.
S
ET MODE
Command: F3h.
Data: write 1 byte.
BIT
DESCRIPTION
Address
the value written becomes
the device address
a ‘1’ enables this function
Enable
X
X
X
X
X
X
X
0
Enable
Reserved
7
6
5
4
3
2
1
0
Power On Value
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