参数资料
型号: M66291GP
元件分类: 总线控制器
英文描述: UNIVERSAL SERIAL BUS CONTROLLER, PQFP48
封装: 7 X 7 MM, 0.50 MM PITCH, PLASTIC, LQFP-48
文件页数: 115/128页
文件大小: 928K
代理商: M66291GP
M66291GP/HP
Rev 1.01 2004.11.01 page 85 of 122
(2) Buffer state and IVAL bit of the IN buffer
The relation between buffer state and IVAL bit is shown in Figure 3.3 when the buffer is set to IN (set by the
EPi_DIR bit/ISEL bit).
The single/double buffer mode is set by the EPi_DBLB bit. The double buffer mode cannot be set at endpoint 0.
<W hen set to single buffer mode>
CPU bus
W hen set to IN buffer
SIE bus
IVAL bit ="0"
Transmit
data
T ransmit data
IVAL bit ="1"
Transmit
data
IVAL bit ="1"
Empty
<W hen set to double buffer mode >
Empty
SIE bus
IVAL bit ="0"
Empty
IVAL bit ="1"
Transmit data
Empty
Transmit data
Empty
IVAL bit ="0"
(EPB_R DY bit is set to "1")
IVAL bit ="1"
Empty
IVAL bit ="0"
(EPB_R DY bit is set to "1")
N ote 1. Response to the host when EP0_PID/EPn_PID bits are set to "01(BUF)".
N ote 2. About the transmit/write completions, refer to the follows:
Endpoint 0
C T RR bit of C ontrol T ransfer Control Register
O thers endpoint 0
EPnRW MD bit of EPn Configuration Register
CPU bus
Accessable
Not accessable
Transmit
data
T ransmit data
Empty
Transmit
data
Transmit
data
T ransmit data
Transmit
data
W rite com pletion (Note 2)
Transm it com pletion (Note 2)
SIE side buffer
CPU side buffer
Empty
Transmit data
IVAL bit ="1"
IVAL bit ="0"
(EPB_R DY bit is set to "1")
Empty
Response (Note1)
NAK
T ransmits data
NAK
SIE side buffer
CPU side buffer
NAK
T ransmits data
NAK
T ransmits data
NAK
Response (Note 1)
W rite com pletion (Note 2)
Transm it com pletion (Note 2)
W rite com pletion (Note 2)
Transm it com pletion (Note 2)
Figure 3.3 Relation between Buffer State and IVAL Bit (when set to IN buffer)
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