參數(shù)資料
型號: IT8673F
廠商: Electronic Theatre Controls, Inc.
英文描述: GT 35C 35#12 SKT PLUG
中文描述: 先進的輸入/輸出(高級I / O)的初步規(guī)范V0.5
文件頁數(shù): 83/128頁
文件大小: 780K
代理商: IT8673F
IT8673F
Table 11-24. Effects of Drive Mode and Data Rate on FORMAT A TRACK and WRITE DATA Commands
3
Data Rate
Drive Mode
Length of GAP2
FORMAT FIELD
Portion of GAP2 Re-Written by WRITE
DATA Command
250/300/500
Kbps
Conventional
Perpendicular
22 bytes
22 bytes
0 bytes
19 bytes
1 Mbps
Conventional
Perpendicular
22 bytes
41 bytes
0 bytes
38 bytes
11.4.12.13 INVALID
The INVALID command indicates when an undefined command has been sent to FDC. The FDC will set
the bit 6 and the bit 7 in the Main Status Register to 1 and terminate the command without issuing an
interrupt.
11.4.13 DMA Transfers
DMA transfers are enabled by the SPECIFY command and are initiated by the FDC by activating the DRQ
cycle during a DATA TRANSFER command. The FIFO is enabled directly by asserting the DMA cycles.
11.4.14
When writing a 1 to the bit 6 of the DSR, the controller is set to low power mode immediately. All the clock
sources including Data Separator, Microcontroller, and Write precompensation unit will be gated. The FDC
can be resumed from the low-power state in two ways. One is a software reset via the DOR or DSR; and the
other is a read or write to either the Data Register or Main Status Register. The second method is more
preferred since all internal register values are retained.
Low Power Mode
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