參數(shù)資料
型號： FDC37C666GT
廠商： STANDARD MICROSYSTEMS CORP
元件分類： 存儲控制器/管理單元
英文描述： High-Performance Multi-Mode Parallel Port Super I/O Floppy Disk Controllers
中文描述： 1 Mbps, IDE COMPATIBLE, FLOPPY DISK DRIVE CONTROLLER, PQFP100
封裝： QFP-100
文件頁數(shù)： 71/152頁
文件大?。?/td> 621K
代理商： FDC37C666GT
71
the time between when the Head Load signal
goes high and the read/write operation starts.
The values change with the data rate speed
selection and are documented in Table 31. The
values are the same for MFM and FM.
Table 31 - Drive Control Delays (ms)
HUT
SRT
1M
128
8
..
112
120
500K
256
16
..
224
240
300K
426
26.7
..
373
400
250K
512
32
..
448
480
1M
8.0
7.5
..
1.0
0.5
500K
16
15
..
2
1
300K
26.7
25
..
3.33
1.67
250K
32
30
..
4
2
0
1
..
E
F
HLT
1M
128
1
2
..
126
127
500K
256
2
4
..
252
254
300K
426
3.3
6.7
..
420
423
250K
512
4
8
.
504
508
00
01
02
..
7F
7F
The choice of DMA or non-DMA operations is
made by the ND bit. When this bit is "1", the
non-DMA mode is selected, and when ND is "0",
the DMA mode is selected. In DMA mode, data
transfers are signalled by the FDRQ pin. Non-
DMA mode uses the RQM bit and the FINT pin
to signal data transfers.
Configure
The Configure command is issued to select the
special features of the FDC. A Configure
command need not be issued if the default
values
of
the
FDC
requirements.
meet
the
system
Configure Default Values:
EIS - No Implied Seeks
EFIFO - FIFO Disabled
POLL - Polling Enabled
FIFOTHR - FIFO Threshold Set to 1 Byte
PRETRK - Pre-Compensation Set to Track 0
EIS - Enable Implied Seek. When set to "1", the
FDC will perform a Seek operation before
executing a read or write command. Defaults to
no implied seek.
EFIFO - A "1" disables the FIFO (default). This
means data transfers are asked for on a byte-
by-byte basis. Defaults to "1", FIFO disabled.
The threshold defaults to "1".
POLL - Disable polling of the drives. Defaults to
"0", polling enabled. When enabled, a single
interrupt is generated after a reset. No polling is
performed while the drive head is loaded and
the head unload delay has not expired.
FIFOTHR - The FIFO threshold in the execution
phase of read or write commands. This is
programmable from 1 to 16 bytes. Defaults to
one byte. A "00" selects one byte; "0F" selects
16 bytes.
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