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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)： | 8/14頁(yè) |
| 文件大?。?/td> | 111K |
| 代理商： | SPCA514A |
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SPCA514A
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3.5.6. Upload Mode (5):
When the USB host wants to update the ROM code for the CPU on flash memory, the
“OprMode” field in the register (0X8301) must be set to the value of 0X5. The new ROM
code is transmitted into post buffer from the PC through the Bulk-OUT pipe. Then the
CPU reads the post buffer and update the ROM code on the flash memory. The deep of
post buffer is 64 bytes in this mode.
3.5.7. Upload Mode (6):
When the USB host wants to pseudo write into flash memory by the CPU, the “OprMode”
field in the register (0X8301) must be set to the value of 0X6. The data is transmitted into
post buffer from the PC through the Bulk-OUT pipe. Then the CPU reads the post buffer
and write into the flash memory. The deep of post buffer is 256 bytes in this mode.
3.5.8. Upload Mode (8):
This is a test mode. In this mode, the “OprMode” field in the register (0X8301) must be
set to the value of 0X8. The CPU will write, read back and compare data through post
buffer and the deep of post buffer is 64 bytes in this mode.
3.6. Power Control
To reduce power-consumption during suspend period, the clock pad is disabled during
suspend state. All the internal clocks stop and the SPCA514 can only accept asynchronous
events during the suspend state. Before the SPCA514 returns to normal operational state,
there
is
an additional state called resume state. During the resume state the clock pad start
oscillation. However, the internal clocks are still masked out to prevent chip malfunction
since during this period the clock is not stable. The following diagram depicts the sequence
for the SCAP514 to enter and get out of the suspend/resume state.
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