FDC37B787-NS Standard Microsystems (SMSC), FDC37B787-NS Datasheet - Page 42

• Manufacturer Part Number: FDC37B787-NS
• Manufacturer: Standard Microsystems (SMSC)

Specifications of FDC37B787-NS

• Pin Count: 128
• Lead Free Status / RoHS Status: Compliant

HLT
HUT
LOCK
MFM
MT
N
NCN
ND
OW
PCN
SYMBOL
Head Load Time
Head Unload Time The time interval from the end of the execution phase (of a read or
MFM/FM Mode
Selector
Multi-Track
Selector
Sector Size Code
New Cylinder
Number
Non-DMA Mode
Flag
Overwrite
Present Cylinder
Number
NAME
TABLE 21 - DESCRIPTION OF COMMAND SYMBOLS
The time interval that FDC waits after loading the head and before
initializing a read or write operation. Refer to the Specify command
for actual delays.
write command) until the head is unloaded. Refer to the Specify
command for actual delays.
Lock defines whether EFIFO, FIFOTHR, and PRETRK parameters of
the CONFIGURE COMMAND can be reset to their default values by
a "software Reset". (A reset caused by writing to the appropriate bits
of either tha DSR or DOR)
A one selects the double density (MFM) mode. A zero selects single
density (FM) mode.
When set, this flag selects the multi-track operating mode. In this
mode, the FDC treats a complete cylinder under head 0 and 1 as a
single track. The FDC operates as this expanded track started at the
first sector under head 0 and ended at the last sector under head 1.
With this flag set, a multitrack read or write operation will
automatically continue to the first sector under head 1 when the FDC
finishes operating on the last sector under head 0.
This specifies the number of bytes in a sector. If this parameter is
"00", then the sector size is 128 bytes.
transferred is determined by the DTL parameter. Otherwise the sector
size is (2 raised to the "N'th" power) times 128. All values up to "07"
hex are allowable. "07"h would equal a sector size of 16k. It is the
user's responsibility to not select combinations that are not possible
with the drive.
N
0
1
2
3
…
The desired cylinder number.
When set to 1, indicates that the FDC is to operate in the non-DMA
mode. In this mode, the host is interrupted for each data transfer.
When set to 0, the FDC operates in DMA mode, interfacing to a DMA
controller by means of the DRQ and nDACK signals.
The bits D0-D3 of the Perpendicular Mode Command can only be
modified if OW is set to 1. OW id defined in the Lock command.
The current position of the head at the completion of Sense Interrupt
Status command.
256 Bytes
512 Bytes
1024 Bytes
Sector Size
128 Bytes
…
42
DESCRIPTION
The number of bytes