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參數(shù)資料
| 型號(hào)： | SPCA514A |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | MOSFET; Transistor Polarity:N Channel; Drain Source Voltage, Vds:60V; Continuous Drain Current, Id:75A; On-Resistance, Rds(on):0.008ohm; Rds(on) Test Voltage, Vgs:10V; Package/Case:TO-263; Leaded Process Compatible:No RoHS Compliant: No |
| 中文描述： | 數(shù)字音頻USB控制器 |
| 文件頁(yè)數(shù)： | 4/14頁(yè) |
| 文件大?。?/td> | 111K |
| 代理商： | SPCA514A |
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SPCA514A
the 8-byte commands in the EP0 FIFO and interrupts the micro-controller. The micro-
controller then read the 8-byte command, decodes it, and prepares the appropriate data
according to the command if necessary. The data, if any, is then sent to the USB bus by
the USB controller.
USB Packet Format
U
U
S
S
B
B
V
V
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n
n
d
d
o
o
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C
C
o
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m
Command
R
R
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a
a
d
d
Write
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d
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f
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R
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R
R
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/
/
bmReqType BRequest
0C1
0x00
0x41
0x00
W
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r
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t
t
e
e
(
(
f
f
o
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r
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x
x
a
a
wValue
reserved
High byte :
reserved
low
byte:
write value
m
p
p
l
l
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)
)
WIndex
address
address
wLength
1
0
U
U
S
S
B
B
B
B
u
u
l
l
k
k
-
-
I
I
N
N
P
P
a
a
c
c
k
k
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t
t
F
F
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r
The maximum packet size is fixed at 64 bytes. The size of each Bulk-IN packet is
either maximum or zero. The zero-padding is applied to the last packet to make the size
maximum if necessary.
m
a
a
t
t
U
U
S
S
B
B
B
B
u
u
l
l
k
k
-
-
O
O
U
U
T
T
P
P
a
a
c
c
k
k
e
e
t
t
F
F
o
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r
r
The maximum packet size is fixed at 64 bytes. The size of each Bulk-OUT packet must
be maximal.
m
a
a
t
t
U
U
S
S
B
B
I
I
n
n
t
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r
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p
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-
-
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N
N
P
P
a
a
c
c
k
k
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t
F
F
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r
r
The maximum packet size is fixed at two bytes. The micro-controller must program the
interrupt pipe registers (both register 0x8506 and 0x8507) after it detects a new event. The
USB controller sends the interrupt data to the host only after register 0x8507 is written.
m
a
a
t
t
3.4. Flash Memory
The flash memory is used to store data. The CPU can transfer command, address
and data to the flash memory by the 8-bit I/O port. There are three operation modes for
the CPU to read/write the flash memory: one is the direct mode, another is the FIFO mode
and the other is pseudo DRAM mode. The ECC that is 22-bit code for every 256 bytes will
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