FDC37C669-MT SMSC, FDC37C669-MT Datasheet - Page 65

• Manufacturer Part Number: FDC37C669-MT
• Description: IC CTRLR SUPER I/O FLPPY 100TQFP
• Manufacturer: SMSC

Specifications of FDC37C669-MT

• Controller Type: I/O Controller
• Interface: ISA Host
• Voltage - Supply: 4.5 V ~ 5.5 V
• Current - Supply: 25mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 100-TQFP, 100-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 638-1008

The values change with the data rate speed selection
and are documented in Table 30. The
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.
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 meet the system
requirements.
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
In DMA mode, data transfers are signaled by the FDRQ
7F
7F
00
01
02
E
0
1
..
F
..
2M
64
56
60
4
..
63.5
2M
0.5
64
63
1
..
128
112
120
1M
8
..
500K
256
224
240
Table 28 - Drive Control Delays (ms)
16
..
HUT
128
126
127
1M
1
2
..
300K
26.7
426
373
400
..
250K
512
448
480
32
..
65
500K
256
252
254
2
4
..
values are the same for MFM and FM.
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.
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.
3.75
0.25
2M
0.5
4
..
HLT
1M
7.5
0.5
8
..
1
300K
426
420
423
3.3
6.7
..
500K
When enabled, a single interrupt is
16
15
..
2
1
SRT
300K
26.7
3.33
1.67
25
..
250K
512
504
508
4
8
.
250K
32
30
..
4
2