FDC37B727-NS Standard Microsystems (SMSC), FDC37B727-NS Datasheet - Page 111

• Manufacturer Part Number: FDC37B727-NS
• Manufacturer: Standard Microsystems (SMSC)

Specifications of FDC37B727-NS

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

FDD Interface Pins
All pins in the FDD interface which can be
connected directly to the floppy disk drive itself are
either DISABLED or TRISTATED.
Note 1: Writing to the DOR or DSR does not wake up the part, however, writing any of the motor
BASE + ADDRESS
enable bits or doing a software reset (via DOR or DSR reset bits) will wake up the part.
00H
01H
02H
03H
04H
06H
07H
07H
04H
05H
TABLE 48 - STATE OF SYSTEM PINS IN AUTO POWERDOWN
TABLE 47 - PC/AT AND PS/2 AVAILABLE REGISTERS
Access to these registers DOES NOT wake up the part
SYSTEM PINS
RESET_DRV
SA[0:9]
SD[0:7]
DACKx
SD[0:7]
DRQx
nIOW
nIOR
Access to these registers wakes up the part
IRQx
TC
DOR (1)
DSR (1)
PC-AT
MSR
CCR
Data
DIR
AVAILABLE REGISTERS
----
----
---
---
OUTPUT PINS
INPUT PINS
STATE IN AUTO POWERDOWN
PS/2 (MODEL 30)
111
DOR (1)
DSR (1)
CCR
MSR
SRA
SRB
Data
DIR
Pins used for local logic control or part
programming are unaffected. Table 46 depicts the
state of the floppy disk drive interface pins in the
powerdown state.
Unchanged (low)
Unchanged (low)
---
---
Unchanged
Unchanged
Unchanged
Unchanged
Unchanged
Unchanged
Unchanged
Unchanged
ACCESS PERMITTED
R/W
R/W
---
W
---
W
R
R
R
R