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參數(shù)資料
| 型號： | STV0676 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | CMOS Digital Camera Co-processor |
| 中文描述： | CMOS數(shù)字相機協(xié)處理器 |
| 文件頁數(shù)： | 9/21頁 |
| 文件大小： | 153K |
| 代理商： | STV0676 |
9/21
STV0676
External interfaces
Benchmark testing of the STV0676 indicates that 30fps CIF video (compressed) can be
accommodated in 50% of USB bandwidth.
2.2
Mode selection
All USB devices report a VID, PID and power consumption as part of a standard device descriptor.
The VID and PID for STV0676 can be configured by the state of the digiport bits or by using an
external EEPROM. The mode selection is made using the two MODESEL pins as described in
Table 3
below.
2.3
Selecting VID and PID via the digiport
Tables 4~7 demonstrate how the VID/PID information is defined via the digiport.
The current reference design for the STV0676-chipset has digiport[7:0] connected to VSS, thus the
VID and PID are 16’h0553 and 16’h0140 respectively.
The digiport also controls the device current consumption that is reported to the host at device
enumeration.
Table 3: Mode selection
MODESEL[1]
MODESEL[0]
Mode of operation
0
0
USB Mode. External EEPROM fitted, therefore PID, VID and power
consumption read from this source. See
Section 2.4
1
0
Slave I
2
C mode.
0
1
USB mode. Default. No external EEPROM fitted, the PID
VID and power consumption data determined by digiport[7:0].
See
Section 2.3
1
1
Reserved
Table 4: Basic digiport configuration
digiport bit slice
function
[3:0]
configures the LS nibble of the PID
[5:4]
master VID/PID select
[7:6]
power setting
Table 5: Digiport LS nibble configuration
digiport[3:0]
PID LS nibble
4’b0000
4’b0000
4’b0001
4’b0001
4’b0010
4’b0010
4’b0011
4’b0011
4’b0100
4’b0100
4’b0101
4’b0101
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