FDC37C935-QS Standard Microsystems (SMSC), FDC37C935-QS Datasheet - Page 19

• Manufacturer Part Number: FDC37C935-QS
• Manufacturer: Standard Microsystems (SMSC)

Specifications of FDC37C935-QS

• Lead Free Status / RoHS Status: Supplier Unconfirmed

Normal Floppy Mode
Normal mode. Register 3F3 contains only bits 0 and 1. When this register is read, bits 2 - 7 are a
high impedance.
Enhanced Floppy Mode 2 (OS2)
Register 3F3 for Enhanced Floppy Mode 2 operation.
For this mode, MEDIA_ID[1:0] pins are gated
into bits 6 and 7 of the 3F3 register. These two
bits are not affected by a hard or soft reset.
BIT 7 MEDIA ID 1 READ ONLY (Pin 19) (See
Table 7)
BIT 6 MEDIA ID 0 READ ONLY (Pin 20) (See
Table 8)
BITS 5 and 4 Drive Type ID - These bits reflect
two
REG 3F3
REG 3F3
Pin 19
Input
of
0
1
the
Tri-state
Table 7 - Media ID1
Media
DB7
DB7
ID1
bits
L0-CRF1-B5
= 0
0
1
Tri-state
of
Media
DB6
DB6
MEDIA ID1
ID0
L0-CRF1.
BIT 7
L0-CRF1-B5
Tri-state
DB5
DB5
Drive Type ID
= 1
Table 9 - Drive Type ID
1
0
Which
Tri-state
DB4
DB4
19
two bits these are depends on the last drive
selected in the Digital Output Register (3F2).
(See Table 9)
Note: L0-CRF1-B5
BITS 3 and 2 Floppy Boot Drive - These bits
reflect the value of L0-CRF1. Bit 3 = L0-CRF1-
B7. Bit 2 = L0-CRF1-B6.
Bits
(READ/WRITE).
Enhanced Floppy Mode. 1.
Tri-state
Floppy Boot Drive
Pin 20
DB3
DB3
Input
1
Configuration Register F1, Bit 5
0
1
and
Table 8 - Media ID0
Tri-state
DB2
DB2
0
Same as in Normal and
CRF1-B4
-
=
= 0
0
1
Tape
Logical
tape sel1 tape sel0
tape sel1 tape sel0
MEDIA ID0
DB1
DB1
BIT 6
Drive
CRF1-B4
Device
= 1
1
0
DB0
DB0
Select
0,