FDC37C665GT-MS SMSC, FDC37C665GT-MS Datasheet - Page 71

• Manufacturer Part Number: FDC37C665GT-MS
• Description: IC CTRLR SUPER I/O MULTI 100-QFP
• Manufacturer: SMSC

Specifications of FDC37C665GT-MS

• Controller Type: I/O Controller
• Interface: ISA Host
• Voltage - Supply: 4.5 V ~ 5.5 V
• Current - Supply: 35mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 100-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 638-1007

the time between when the Head Load signal
goes high and the read/write operation starts.
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.
command need not be issued if the default
values
requirements.
Configure Default Values:
EIS - No Implied Seeks
EFIFO - FIFO Disabled
POLL - Polling Enabled
FIFOTHR - FIFO Threshold Set to 1 Byte
of
00
01
02
7F
7F
E
0
1
..
F
..
the
128
112
120
1M
8
..
FDC
128
126
127
1M
1
2
..
500K
256
224
240
meet
16
..
Table 31 - Drive Control Delays (ms)
HUT
the
A Configure
300K
26.7
426
373
400
..
system
500K
256
252
254
2
4
..
250K
512
448
480
32
..
71
HLT
The values change with the data rate speed
selection and are documented in Table 31. The
values are the same for MFM and FM.
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.
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.
programmable from 1 to 16 bytes. Defaults to
one byte. A "00" selects one byte; "0F" selects
16 bytes.
1M
8.0
7.5
1.0
0.5
..
300K
426
420
423
3.3
6.7
..
500K
16
15
..
2
1
SRT
300K
26.7
3.33
1.67
When enabled, a single
25
..
250K
512
504
508
4
8
.
250K
32
30
..
4
2
This is